#include <linux/mm.h>
#include "dbi_kprobes.h"
+#include "trampoline_arm.h"
#include "../dbi_kprobes.h"
+#include "../../dbi_kprobes.h"
#include "../../dbi_kdebug.h"
#include "../../dbi_insn_slots.h"
#include "../../dbi_kprobes_deps.h"
-#include "../../dbi_uprobes.h"
+#include <ksyms.h>
#include <asm/cacheflush.h>
-
-#ifdef OVERHEAD_DEBUG
-#include <linux/time.h>
-#endif
-
#include <asm/traps.h>
#include <asm/ptrace.h>
#include <linux/list.h>
#define SUPRESS_BUG_MESSAGES
-extern unsigned long sched_addr;
-extern unsigned long fork_addr;
-
extern struct kprobe * per_cpu__current_kprobe;
-extern spinlock_t kretprobe_lock;
-extern struct kretprobe *sched_rp;
-
-extern struct hlist_head kprobe_insn_pages;
-extern struct hlist_head uprobe_insn_pages;
-
-extern unsigned long (*kallsyms_search) (const char *name);
-
-extern struct kprobe *kprobe_running(void);
-extern void reset_current_kprobe(void);
-extern struct kprobe_ctlblk *get_kprobe_ctlblk(void);
-extern struct kprobe * current_kprobe;
-
extern struct hlist_head kprobe_table[KPROBE_TABLE_SIZE];
-#ifdef OVERHEAD_DEBUG
-unsigned long swap_sum_time = 0;
-unsigned long swap_sum_hit = 0;
-EXPORT_SYMBOL_GPL (swap_sum_time);
-EXPORT_SYMBOL_GPL (swap_sum_hit);
-#endif
-
-#define sign_extend(x, signbit) ((x) | (0 - ((x) & (1 << (signbit)))))
-#define branch_displacement(insn) sign_extend(((insn) & 0xffffff) << 2, 25)
+static void (*__swap_register_undef_hook)(struct undef_hook *hook);
+static void (*__swap_unregister_undef_hook)(struct undef_hook *hook);
-static kprobe_opcode_t get_addr_b(kprobe_opcode_t insn, kprobe_opcode_t *addr)
+static struct kprobe trampoline_p =
{
- // real position less then PC by 8
- return (kprobe_opcode_t)((long)addr + 8 + branch_displacement(insn));
-}
-
-unsigned int arr_traps_template[] = {
- 0xe1a0c00d, // mov ip, sp
- 0xe92dd800, // stmdb sp!, {fp, ip, lr, pc}
- 0xe24cb004, // sub fp, ip, #4 ; 0x4
- 0x00000000, // b
- 0xe3500000, // cmp r0, #0 ; 0x0
- 0xe89da800, // ldmia sp, {fp, sp, pc}
- 0x00000000, // nop
- 0xffffffff // end
-};
-
-
-struct kprobe trampoline_p =
-{
- .addr = (kprobe_opcode_t *) & kretprobe_trampoline,
+ .addr = (kprobe_opcode_t *)&kretprobe_trampoline,
.pre_handler = trampoline_probe_handler
};
-// is instruction Thumb2 and NOT a branch, etc...
-int isThumb2(kprobe_opcode_t insn)
-{
- if(( (insn & 0xf800) == 0xe800 ||
- (insn & 0xf800) == 0xf000 ||
- (insn & 0xf800) == 0xf800)) return 1;
- return 0;
-}
-
-
-int prep_pc_dep_insn_execbuf (kprobe_opcode_t * insns, kprobe_opcode_t insn, int uregs)
+int prep_pc_dep_insn_execbuf(kprobe_opcode_t *insns, kprobe_opcode_t insn, int uregs)
{
int i;
- if (uregs & 0x10)
- {
+ if (uregs & 0x10) {
int reg_mask = 0x1;
//search in reg list
- for (i = 0; i < 13; i++, reg_mask <<= 1)
- {
+ for (i = 0; i < 13; i++, reg_mask <<= 1) {
if (!(insn & reg_mask))
break;
}
- }
- else
- {
- for (i = 0; i < 13; i++)
- {
- if ((uregs & 0x1) && (ARM_INSN_REG_RN (insn) == i))
+ } else {
+ for (i = 0; i < 13; i++) {
+ if ((uregs & 0x1) && (ARM_INSN_REG_RN(insn) == i))
continue;
- if ((uregs & 0x2) && (ARM_INSN_REG_RD (insn) == i))
+ if ((uregs & 0x2) && (ARM_INSN_REG_RD(insn) == i))
continue;
- if ((uregs & 0x4) && (ARM_INSN_REG_RS (insn) == i))
+ if ((uregs & 0x4) && (ARM_INSN_REG_RS(insn) == i))
continue;
- if ((uregs & 0x8) && (ARM_INSN_REG_RM (insn) == i))
+ if ((uregs & 0x8) && (ARM_INSN_REG_RM(insn) == i))
continue;
break;
}
}
- if (i == 13)
- {
+
+ if (i == 13) {
DBPRINTF ("there are no free register %x in insn %lx!", uregs, insn);
return -EINVAL;
}
DBPRINTF ("prep_pc_dep_insn_execbuf: using R%d, changing regs %x", i, uregs);
// set register to save
- ARM_INSN_REG_SET_RD (insns[0], i);
+ ARM_INSN_REG_SET_RD(insns[0], i);
// set register to load address to
- ARM_INSN_REG_SET_RD (insns[1], i);
+ ARM_INSN_REG_SET_RD(insns[1], i);
// set instruction to execute and patch it
- if (uregs & 0x10)
- {
- ARM_INSN_REG_CLEAR_MR (insn, 15);
- ARM_INSN_REG_SET_MR (insn, i);
- }
- else
- {
- if ((uregs & 0x1) && (ARM_INSN_REG_RN (insn) == 15))
- ARM_INSN_REG_SET_RN (insn, i);
- if ((uregs & 0x2) && (ARM_INSN_REG_RD (insn) == 15))
- ARM_INSN_REG_SET_RD (insn, i);
- if ((uregs & 0x4) && (ARM_INSN_REG_RS (insn) == 15))
- ARM_INSN_REG_SET_RS (insn, i);
- if ((uregs & 0x8) && (ARM_INSN_REG_RM (insn) == 15))
- ARM_INSN_REG_SET_RM (insn, i);
+ if (uregs & 0x10) {
+ ARM_INSN_REG_CLEAR_MR(insn, 15);
+ ARM_INSN_REG_SET_MR(insn, i);
+ } else {
+ if ((uregs & 0x1) && (ARM_INSN_REG_RN(insn) == 15))
+ ARM_INSN_REG_SET_RN(insn, i);
+ if ((uregs & 0x2) && (ARM_INSN_REG_RD(insn) == 15))
+ ARM_INSN_REG_SET_RD(insn, i);
+ if ((uregs & 0x4) && (ARM_INSN_REG_RS(insn) == 15))
+ ARM_INSN_REG_SET_RS(insn, i);
+ if ((uregs & 0x8) && (ARM_INSN_REG_RM(insn) == 15))
+ ARM_INSN_REG_SET_RM(insn, i);
}
+
insns[UPROBES_TRAMP_INSN_IDX] = insn;
// set register to restore
- ARM_INSN_REG_SET_RD (insns[3], i);
- return 0;
-}
-
-
-
-int prep_pc_dep_insn_execbuf_thumb (kprobe_opcode_t * insns, kprobe_opcode_t insn, int uregs)
-{
- unsigned char mreg = 0;
- unsigned char reg = 0;
-
-
- if (THUMB_INSN_MATCH (APC, insn) || THUMB_INSN_MATCH (LRO3, insn))
- {
- reg = ((insn & 0xffff) & uregs) >> 8;
- }else{
- if (THUMB_INSN_MATCH (MOV3, insn))
- {
- if (((((unsigned char) insn) & 0xff) >> 3) == 15)
- reg = (insn & 0xffff) & uregs;
- else
- return 0;
- }else{
- if (THUMB2_INSN_MATCH (ADR, insn))
- {
- reg = ((insn >> 16) & uregs) >> 8;
- if (reg == 15) return 0;
- }else{
- if (THUMB2_INSN_MATCH (LDRW, insn) || THUMB2_INSN_MATCH (LDRW1, insn) ||
- THUMB2_INSN_MATCH (LDRHW, insn) || THUMB2_INSN_MATCH (LDRHW1, insn) ||
- THUMB2_INSN_MATCH (LDRWL, insn))
- {
- reg = ((insn >> 16) & uregs) >> 12;
- if (reg == 15) return 0;
- }else{
-// LDRB.W PC, [PC, #immed] => PLD [PC, #immed], so Rt == PC is skipped
- if (THUMB2_INSN_MATCH (LDRBW, insn) || THUMB2_INSN_MATCH (LDRBW1, insn) || THUMB2_INSN_MATCH (LDREX, insn))
- {
- reg = ((insn >> 16) & uregs) >> 12;
- }else{
- if (THUMB2_INSN_MATCH (DP, insn))
- {
- reg = ((insn >> 16) & uregs) >> 12;
- if (reg == 15) return 0;
- }else{
- if (THUMB2_INSN_MATCH (RSBW, insn))
- {
- reg = ((insn >> 12) & uregs) >> 8;
- if (reg == 15) return 0;
- }else{
- if (THUMB2_INSN_MATCH (RORW, insn))
- {
- reg = ((insn >> 12) & uregs) >> 8;
- if (reg == 15) return 0;
- }else{
- if (THUMB2_INSN_MATCH (ROR, insn) || THUMB2_INSN_MATCH (LSLW1, insn) || THUMB2_INSN_MATCH (LSLW2, insn) || THUMB2_INSN_MATCH (LSRW1, insn) || THUMB2_INSN_MATCH (LSRW2, insn))
- {
- reg = ((insn >> 12) & uregs) >> 8;
- if (reg == 15) return 0;
- }else{
- if (THUMB2_INSN_MATCH (TEQ1, insn) || THUMB2_INSN_MATCH (TST1, insn))
- {
- reg = 15;
- }else{
- if (THUMB2_INSN_MATCH (TEQ2, insn) || THUMB2_INSN_MATCH (TST2, insn))
- {
- reg = THUMB2_INSN_REG_RM(insn);
- }
- }
- }
- }
- }
- }
- }
- }
- }
- }
- }
-
- if (( THUMB2_INSN_MATCH (STRW, insn) || THUMB2_INSN_MATCH (STRBW, insn) || THUMB2_INSN_MATCH (STRD, insn) || \
- THUMB2_INSN_MATCH (STRHT, insn) || THUMB2_INSN_MATCH (STRT, insn) || THUMB2_INSN_MATCH (STRHW1, insn) || \
- THUMB2_INSN_MATCH (STRHW, insn)) && THUMB2_INSN_REG_RT(insn) == 15)
- {
- reg = THUMB2_INSN_REG_RT(insn);
- }
-
- if (reg == 6 || reg == 7)
- {
- *((unsigned short*)insns + 0) = (*((unsigned short*)insns + 0) & 0x00ff) | ((1 << mreg) | (1 << (mreg + 1)));
- *((unsigned short*)insns + 1) = (*((unsigned short*)insns + 1) & 0xf8ff) | (mreg << 8);
- *((unsigned short*)insns + 2) = (*((unsigned short*)insns + 2) & 0xfff8) | (mreg + 1);
- *((unsigned short*)insns + 3) = (*((unsigned short*)insns + 3) & 0xffc7) | (mreg << 3);
- *((unsigned short*)insns + 7) = (*((unsigned short*)insns + 7) & 0xf8ff) | (mreg << 8);
- *((unsigned short*)insns + 8) = (*((unsigned short*)insns + 8) & 0xffc7) | (mreg << 3);
- *((unsigned short*)insns + 9) = (*((unsigned short*)insns + 9) & 0xffc7) | ((mreg + 1) << 3);
- *((unsigned short*)insns + 10) = (*((unsigned short*)insns + 10) & 0x00ff) | (( 1 << mreg) | (1 << (mreg + 1)));
- }
-
-
- if (THUMB_INSN_MATCH (APC, insn))
- {
-// ADD Rd, PC, #immed_8*4 -> ADD Rd, SP, #immed_8*4
- *((unsigned short*)insns + 4) = ((insn & 0xffff) | 0x800); // ADD Rd, SP, #immed_8*4
- }else{
- if (THUMB_INSN_MATCH (LRO3, insn))
- {
-// LDR Rd, [PC, #immed_8*4] -> LDR Rd, [SP, #immed_8*4]
- *((unsigned short*)insns + 4) = ((insn & 0xffff) + 0x5000); // LDR Rd, [SP, #immed_8*4]
- }else{
- if (THUMB_INSN_MATCH (MOV3, insn))
- {
-// MOV Rd, PC -> MOV Rd, SP
- *((unsigned short*)insns + 4) = ((insn & 0xffff) ^ 0x10); // MOV Rd, SP
- }else{
- if (THUMB2_INSN_MATCH (ADR, insn))
- {
-// ADDW Rd, PC, #imm -> ADDW Rd, SP, #imm
- insns[2] = (insn & 0xfffffff0) | 0x0d; // ADDW Rd, SP, #imm
- }else{
- if (THUMB2_INSN_MATCH (LDRW, insn) || THUMB2_INSN_MATCH (LDRBW, insn) ||
- THUMB2_INSN_MATCH (LDRHW, insn))
- {
-// LDR.W Rt, [PC, #-<imm_12>] -> LDR.W Rt, [SP, #-<imm_8>]
-// !!!!!!!!!!!!!!!!!!!!!!!!
-// !!! imm_12 vs. imm_8 !!!
-// !!!!!!!!!!!!!!!!!!!!!!!!
- insns[2] = (insn & 0xf0fffff0) | 0x0c00000d; // LDR.W Rt, [SP, #-<imm_8>]
- }else{
- if (THUMB2_INSN_MATCH (LDRW1, insn) || THUMB2_INSN_MATCH (LDRBW1, insn) ||
- THUMB2_INSN_MATCH (LDRHW1, insn) || THUMB2_INSN_MATCH (LDRD, insn) || THUMB2_INSN_MATCH (LDRD1, insn) ||
- THUMB2_INSN_MATCH (LDREX, insn))
- {
-// LDRx.W Rt, [PC, #+<imm_12>] -> LDRx.W Rt, [SP, #+<imm_12>] (+/-imm_8 for LDRD Rt, Rt2, [PC, #<imm_8>]
- insns[2] = (insn & 0xfffffff0) | 0xd; // LDRx.W Rt, [SP, #+<imm_12>]
- }else{
- if (THUMB2_INSN_MATCH (MUL, insn))
- {
- insns[2] = (insn & 0xfff0ffff) | 0x000d0000; // MUL Rd, Rn, SP
- }else{ if (THUMB2_INSN_MATCH (DP, insn))
- {
- if (THUMB2_INSN_REG_RM(insn) == 15) insns[2] = (insn & 0xfff0ffff) | 0x000d0000; // DP Rd, Rn, PC
- else if (THUMB2_INSN_REG_RN(insn) == 15) insns[2] = (insn & 0xfffffff0) | 0xd; // DP Rd, PC, Rm
- }else{ if (THUMB2_INSN_MATCH (LDRWL, insn))
- {
-// LDRx.W Rt, [PC, #<imm_12>] -> LDRx.W Rt, [SP, #+<imm_12>] (+/-imm_8 for LDRD Rt, Rt2, [PC, #<imm_8>]
- insns[2] = (insn & 0xfffffff0) | 0xd; // LDRx.W Rt, [SP, #+<imm_12>]
- }else{ if (THUMB2_INSN_MATCH (RSBW, insn))
- {
- insns[2] = (insn & 0xfffffff0) | 0xd; // RSB{S}.W Rd, PC, #<const> -> RSB{S}.W Rd, SP, #<const>
- }else{ if (THUMB2_INSN_MATCH (RORW, insn) || THUMB2_INSN_MATCH (LSLW1, insn) || THUMB2_INSN_MATCH (LSRW1, insn))
- {
- if ((THUMB2_INSN_REG_RM(insn) == 15) && (THUMB2_INSN_REG_RN(insn) == 15))
- {
- insns[2] = (insn & 0xfffdfffd); // ROR.W Rd, PC, PC
- }else if (THUMB2_INSN_REG_RM(insn) == 15) insns[2] = (insn & 0xfff0ffff) | 0xd0000; // ROR.W Rd, Rn, PC
- else if (THUMB2_INSN_REG_RN(insn) == 15) insns[2] = (insn & 0xfffffff0) | 0xd; // ROR.W Rd, PC, Rm
- }else{ if (THUMB2_INSN_MATCH (ROR, insn) || THUMB2_INSN_MATCH (LSLW2, insn) || THUMB2_INSN_MATCH (LSRW2, insn))
- {
- insns[2] = (insn & 0xfff0ffff) | 0xd0000; // ROR{S} Rd, PC, #<const> -> ROR{S} Rd, SP, #<const>
- }
- }
- }
- }
- }
- }
- }
- }
- }
- }
- }
- }
-
- if (THUMB2_INSN_MATCH (STRW, insn) || THUMB2_INSN_MATCH (STRBW, insn))
- {
- insns[2] = (insn & 0xfff0ffff) | 0x000d0000; // STRx.W Rt, [Rn, SP]
- }else{
- if (THUMB2_INSN_MATCH (STRD, insn) || THUMB2_INSN_MATCH (STRHT, insn) || THUMB2_INSN_MATCH (STRT, insn) || THUMB2_INSN_MATCH (STRHW1, insn))
- {
- if (THUMB2_INSN_REG_RN(insn) == 15)
- {
- insns[2] = (insn & 0xfffffff0) | 0xd; // STRD/T/HT{.W} Rt, [SP, ...]
- }else{
- insns[2] = insn;
- }
- }else{
- if (THUMB2_INSN_MATCH (STRHW, insn) && (THUMB2_INSN_REG_RN(insn) == 15))
- {
- if (THUMB2_INSN_REG_RN(insn) == 15)
- {
- insns[2] = (insn & 0xf0fffff0) | 0x0c00000d; // STRH.W Rt, [SP, #-<imm_8>]
- }else{
- insns[2] = insn;
- }
- }
- }
- }
-
-// STRx PC, xxx
- if ((reg == 15) && (THUMB2_INSN_MATCH (STRW, insn) || \
- THUMB2_INSN_MATCH (STRBW, insn) || \
- THUMB2_INSN_MATCH (STRD, insn) || \
- THUMB2_INSN_MATCH (STRHT, insn) || \
- THUMB2_INSN_MATCH (STRT, insn) || \
- THUMB2_INSN_MATCH (STRHW1, insn) || \
- THUMB2_INSN_MATCH (STRHW, insn) ))
- {
- insns[2] = (insns[2] & 0x0fffffff) | 0xd0000000;
- }
-
-
-
- if (THUMB2_INSN_MATCH (TEQ1, insn) || THUMB2_INSN_MATCH (TST1, insn))
- {
- insns[2] = (insn & 0xfffffff0) | 0xd; // TEQ SP, #<const>
- }else{ if (THUMB2_INSN_MATCH (TEQ2, insn) || THUMB2_INSN_MATCH (TST2, insn))
- {
- if ((THUMB2_INSN_REG_RN(insn) == 15) && (THUMB2_INSN_REG_RM(insn) == 15))
- {
- insns[2] = (insn & 0xfffdfffd); // TEQ/TST PC, PC
- }else if (THUMB2_INSN_REG_RM(insn) == 15) insns[2] = (insn & 0xfff0ffff) | 0xd0000; // TEQ/TST Rn, PC
- else if (THUMB2_INSN_REG_RN(insn) == 15) insns[2] = (insn & 0xfffffff0) | 0xd; // TEQ/TST PC, Rm
- }
- }
+ ARM_INSN_REG_SET_RD(insns[3], i);
return 0;
}
+EXPORT_SYMBOL_GPL(prep_pc_dep_insn_execbuf);
-
-
-int arch_check_insn_arm (struct arch_specific_insn *ainsn)
+int arch_check_insn_arm(struct arch_specific_insn *ainsn)
{
int ret = 0;
// check instructions that can change PC by nature
if (
-// ARM_INSN_MATCH (UNDEF, ainsn->insn_arm[0]) ||
- ARM_INSN_MATCH (AUNDEF, ainsn->insn_arm[0]) ||
- ARM_INSN_MATCH (SWI, ainsn->insn_arm[0]) ||
- ARM_INSN_MATCH (BREAK, ainsn->insn_arm[0]) ||
- ARM_INSN_MATCH (BL, ainsn->insn_arm[0]) ||
- ARM_INSN_MATCH (BLX1, ainsn->insn_arm[0]) ||
- ARM_INSN_MATCH (BLX2, ainsn->insn_arm[0]) ||
- ARM_INSN_MATCH (BX, ainsn->insn_arm[0]) ||
- ARM_INSN_MATCH (BXJ, ainsn->insn_arm[0]))
- {
+// ARM_INSN_MATCH(UNDEF, ainsn->insn_arm[0]) ||
+ ARM_INSN_MATCH(AUNDEF, ainsn->insn_arm[0]) ||
+ ARM_INSN_MATCH(SWI, ainsn->insn_arm[0]) ||
+ ARM_INSN_MATCH(BREAK, ainsn->insn_arm[0]) ||
+ ARM_INSN_MATCH(BL, ainsn->insn_arm[0]) ||
+ ARM_INSN_MATCH(BLX1, ainsn->insn_arm[0]) ||
+ ARM_INSN_MATCH(BLX2, ainsn->insn_arm[0]) ||
+ ARM_INSN_MATCH(BX, ainsn->insn_arm[0]) ||
+ ARM_INSN_MATCH(BXJ, ainsn->insn_arm[0])) {
DBPRINTF ("Bad insn arch_check_insn_arm: %lx\n", ainsn->insn_arm[0]);
ret = -EFAULT;
- }
#ifndef CONFIG_CPU_V7
// check instructions that can write result to PC
- else if ((ARM_INSN_MATCH (DPIS, ainsn->insn_arm[0]) ||
- ARM_INSN_MATCH (DPRS, ainsn->insn_arm[0]) ||
- ARM_INSN_MATCH (DPI, ainsn->insn_arm[0]) ||
- ARM_INSN_MATCH (LIO, ainsn->insn_arm[0]) ||
- ARM_INSN_MATCH (LRO, ainsn->insn_arm[0])) &&
- (ARM_INSN_REG_RD (ainsn->insn_arm[0]) == 15))
- {
+ } else if ((ARM_INSN_MATCH(DPIS, ainsn->insn_arm[0]) ||
+ ARM_INSN_MATCH(DPRS, ainsn->insn_arm[0]) ||
+ ARM_INSN_MATCH(DPI, ainsn->insn_arm[0]) ||
+ ARM_INSN_MATCH(LIO, ainsn->insn_arm[0]) ||
+ ARM_INSN_MATCH(LRO, ainsn->insn_arm[0])) &&
+ (ARM_INSN_REG_RD(ainsn->insn_arm[0]) == 15)) {
DBPRINTF ("Bad arch_check_insn_arm: %lx\n", ainsn->insn_arm[0]);
ret = -EFAULT;
- }
#endif // CONFIG_CPU_V7
// check special instruction loads store multiple registers
- else if ((ARM_INSN_MATCH (LM, ainsn->insn_arm[0]) || ARM_INSN_MATCH (SM, ainsn->insn_arm[0])) &&
+ } else if ((ARM_INSN_MATCH(LM, ainsn->insn_arm[0]) || ARM_INSN_MATCH(SM, ainsn->insn_arm[0])) &&
// store pc or load to pc
- (ARM_INSN_REG_MR (ainsn->insn_arm[0], 15) ||
+ (ARM_INSN_REG_MR(ainsn->insn_arm[0], 15) ||
// store/load with pc update
- ((ARM_INSN_REG_RN (ainsn->insn_arm[0]) == 15) && (ainsn->insn_arm[0] & 0x200000))))
- {
+ ((ARM_INSN_REG_RN(ainsn->insn_arm[0]) == 15) && (ainsn->insn_arm[0] & 0x200000)))) {
DBPRINTF ("Bad insn arch_check_insn_arm: %lx\n", ainsn->insn_arm[0]);
ret = -EFAULT;
}
- return ret;
-}
-
-int arch_check_insn_thumb (struct arch_specific_insn *ainsn)
-{
- int ret = 0;
-
- // check instructions that can change PC
- if ( THUMB_INSN_MATCH (UNDEF, ainsn->insn_thumb[0]) ||
- THUMB_INSN_MATCH (SWI, ainsn->insn_thumb[0]) ||
- THUMB_INSN_MATCH (BREAK, ainsn->insn_thumb[0]) ||
- THUMB2_INSN_MATCH (BL, ainsn->insn_thumb[0]) ||
- THUMB_INSN_MATCH (B1, ainsn->insn_thumb[0]) ||
- THUMB_INSN_MATCH (B2, ainsn->insn_thumb[0]) ||
- THUMB_INSN_MATCH (CBZ, ainsn->insn_thumb[0]) ||
- THUMB2_INSN_MATCH (B1, ainsn->insn_thumb[0]) ||
- THUMB2_INSN_MATCH (B2, ainsn->insn_thumb[0]) ||
- THUMB2_INSN_MATCH (BLX1, ainsn->insn_thumb[0]) ||
- THUMB_INSN_MATCH (BLX2, ainsn->insn_thumb[0]) ||
- THUMB_INSN_MATCH (BX, ainsn->insn_thumb[0]) ||
- THUMB2_INSN_MATCH (BXJ, ainsn->insn_thumb[0]) ||
- (THUMB2_INSN_MATCH (ADR, ainsn->insn_thumb[0]) && THUMB2_INSN_REG_RD(ainsn->insn_thumb[0]) == 15) ||
- (THUMB2_INSN_MATCH (LDRW, ainsn->insn_thumb[0]) && THUMB2_INSN_REG_RT(ainsn->insn_thumb[0]) == 15) ||
- (THUMB2_INSN_MATCH (LDRW1, ainsn->insn_thumb[0]) && THUMB2_INSN_REG_RT(ainsn->insn_thumb[0]) == 15) ||
- (THUMB2_INSN_MATCH (LDRHW, ainsn->insn_thumb[0]) && THUMB2_INSN_REG_RT(ainsn->insn_thumb[0]) == 15) ||
- (THUMB2_INSN_MATCH (LDRHW1, ainsn->insn_thumb[0]) && THUMB2_INSN_REG_RT(ainsn->insn_thumb[0]) == 15) ||
- (THUMB2_INSN_MATCH (LDRWL, ainsn->insn_thumb[0]) && THUMB2_INSN_REG_RT(ainsn->insn_thumb[0]) == 15) ||
- THUMB2_INSN_MATCH (LDMIA, ainsn->insn_thumb[0]) ||
- THUMB2_INSN_MATCH (LDMDB, ainsn->insn_thumb[0]) ||
- (THUMB2_INSN_MATCH (DP, ainsn->insn_thumb[0]) && THUMB2_INSN_REG_RD(ainsn->insn_thumb[0]) == 15) ||
- (THUMB2_INSN_MATCH (RSBW, ainsn->insn_thumb[0]) && THUMB2_INSN_REG_RD(ainsn->insn_thumb[0]) == 15) ||
- (THUMB2_INSN_MATCH (RORW, ainsn->insn_thumb[0]) && THUMB2_INSN_REG_RD(ainsn->insn_thumb[0]) == 15) ||
- (THUMB2_INSN_MATCH (ROR, ainsn->insn_thumb[0]) && THUMB2_INSN_REG_RD(ainsn->insn_thumb[0]) == 15) ||
- (THUMB2_INSN_MATCH (LSLW1, ainsn->insn_thumb[0]) && THUMB2_INSN_REG_RD(ainsn->insn_thumb[0]) == 15) ||
- (THUMB2_INSN_MATCH (LSLW2, ainsn->insn_thumb[0]) && THUMB2_INSN_REG_RD(ainsn->insn_thumb[0]) == 15) ||
- (THUMB2_INSN_MATCH (LSRW1, ainsn->insn_thumb[0]) && THUMB2_INSN_REG_RD(ainsn->insn_thumb[0]) == 15) ||
- (THUMB2_INSN_MATCH (LSRW2, ainsn->insn_thumb[0]) && THUMB2_INSN_REG_RD(ainsn->insn_thumb[0]) == 15) ||
-/* skip PC, #-imm12 -> SP, #-imm8 and Tegra-hanging instructions */
- (THUMB2_INSN_MATCH (STRW1, ainsn->insn_thumb[0]) && THUMB2_INSN_REG_RN(ainsn->insn_thumb[0]) == 15) ||
- (THUMB2_INSN_MATCH (STRBW1, ainsn->insn_thumb[0]) && THUMB2_INSN_REG_RN(ainsn->insn_thumb[0]) == 15) ||
- (THUMB2_INSN_MATCH (STRHW1, ainsn->insn_thumb[0]) && THUMB2_INSN_REG_RN(ainsn->insn_thumb[0]) == 15) ||
- (THUMB2_INSN_MATCH (STRW, ainsn->insn_thumb[0]) && THUMB2_INSN_REG_RN(ainsn->insn_thumb[0]) == 15) ||
- (THUMB2_INSN_MATCH (STRHW, ainsn->insn_thumb[0]) && THUMB2_INSN_REG_RN(ainsn->insn_thumb[0]) == 15) ||
- (THUMB2_INSN_MATCH (LDRW, ainsn->insn_thumb[0]) && THUMB2_INSN_REG_RN(ainsn->insn_thumb[0]) == 15) ||
- (THUMB2_INSN_MATCH (LDRBW, ainsn->insn_thumb[0]) && THUMB2_INSN_REG_RN(ainsn->insn_thumb[0]) == 15) ||
- (THUMB2_INSN_MATCH (LDRHW, ainsn->insn_thumb[0]) && THUMB2_INSN_REG_RN(ainsn->insn_thumb[0]) == 15) ||
-/* skip STRDx/LDRDx Rt, Rt2, [Rd, ...] */
- (THUMB2_INSN_MATCH (LDRD, ainsn->insn_thumb[0]) || THUMB2_INSN_MATCH (LDRD1, ainsn->insn_thumb[0]) || THUMB2_INSN_MATCH (STRD, ainsn->insn_thumb[0])) )
- {
- DBPRINTF ("Bad insn arch_check_insn_thumb: %lx\n", ainsn->insn_thumb[0]);
- ret = -EFAULT;
- }
return ret;
}
+EXPORT_SYMBOL_GPL(arch_check_insn_arm);
-int arch_prepare_kretprobe (struct kretprobe *p)
-{
- DBPRINTF("Warrning: arch_prepare_kretprobe is not implemented\n");
- return 0;
-}
-
-int arch_prepare_kprobe (struct kprobe *p)
+int arch_prepare_kprobe(struct kprobe *p, struct slot_manager *sm)
{
kprobe_opcode_t insns[KPROBES_TRAMP_LEN];
int uregs, pc_dep, ret = 0;
- kprobe_opcode_t insn[MAX_INSN_SIZE];
- struct arch_specific_insn ainsn;
-
- /* insn: must be on special executable page on i386. */
- p->ainsn.insn = get_insn_slot (NULL, 0);
- if (!p->ainsn.insn)
- return -ENOMEM;
-
- memcpy (insn, p->addr, MAX_INSN_SIZE * sizeof (kprobe_opcode_t));
- ainsn.insn_arm = ainsn.insn = insn;
- ret = arch_check_insn_arm (&ainsn);
- if (!ret)
- {
- p->opcode = *p->addr;
- uregs = pc_dep = 0;
-
- // Rn, Rm ,Rd
- if(ARM_INSN_MATCH (DPIS, insn[0]) || ARM_INSN_MATCH (LRO, insn[0]) ||
- ARM_INSN_MATCH (SRO, insn[0]))
- {
- uregs = 0xb;
- if( (ARM_INSN_REG_RN (insn[0]) == 15) || (ARM_INSN_REG_RM (insn[0]) == 15) ||
- (ARM_INSN_MATCH (SRO, insn[0]) && (ARM_INSN_REG_RD (insn[0]) == 15)) )
- {
- DBPRINTF ("Unboostable insn %lx, DPIS/LRO/SRO\n", insn[0]);
- pc_dep = 1;
- }
- }
- // Rn ,Rd
- else if(ARM_INSN_MATCH (DPI, insn[0]) || ARM_INSN_MATCH (LIO, insn[0]) ||
- ARM_INSN_MATCH (SIO, insn[0]))
- {
- uregs = 0x3;
- if ((ARM_INSN_REG_RN (insn[0]) == 15) || (ARM_INSN_MATCH (SIO, insn[0]) &&
- (ARM_INSN_REG_RD (insn[0]) == 15)))
- {
- pc_dep = 1;
- DBPRINTF ("Unboostable insn %lx/%p, DPI/LIO/SIO\n", insn[0], p);
- }
- }
- // Rn, Rm, Rs
- else if(ARM_INSN_MATCH (DPRS, insn[0]))
- {
- uregs = 0xd;
- if ((ARM_INSN_REG_RN (insn[0]) == 15) || (ARM_INSN_REG_RM (insn[0]) == 15) ||
- (ARM_INSN_REG_RS (insn[0]) == 15))
- {
- pc_dep = 1;
- DBPRINTF ("Unboostable insn %lx, DPRS\n", insn[0]);
- }
- }
- // register list
- else if(ARM_INSN_MATCH (SM, insn[0]))
- {
- uregs = 0x10;
- if (ARM_INSN_REG_MR (insn[0], 15))
- {
- DBPRINTF ("Unboostable insn %lx, SM\n", insn[0]);
- pc_dep = 1;
- }
- }
- // check instructions that can write result to SP andu uses PC
- if (pc_dep && (ARM_INSN_REG_RD (ainsn.insn[0]) == 13))
- {
- free_insn_slot(&kprobe_insn_pages, NULL, p->ainsn.insn);
- ret = -EFAULT;
- }
- else
- {
- if (uregs && pc_dep)
- {
- memcpy (insns, pc_dep_insn_execbuf, sizeof (insns));
- if (prep_pc_dep_insn_execbuf (insns, insn[0], uregs) != 0)
- {
- DBPRINTF ("failed to prepare exec buffer for insn %lx!", insn[0]);
- free_insn_slot(&kprobe_insn_pages, NULL, p->ainsn.insn);
- return -EINVAL;
- }
- insns[6] = (kprobe_opcode_t) (p->addr + 2);
- }
- else
- {
- memcpy (insns, gen_insn_execbuf, sizeof (insns));
- insns[KPROBES_TRAMP_INSN_IDX] = insn[0];
- }
- insns[7] = (kprobe_opcode_t) (p->addr + 1);
- DBPRINTF ("arch_prepare_kprobe: insn %lx", insn[0]);
- DBPRINTF ("arch_prepare_kprobe: to %p - %lx %lx %lx %lx %lx %lx %lx %lx %lx",
- p->ainsn.insn, insns[0], insns[1], insns[2], insns[3], insns[4],
- insns[5], insns[6], insns[7], insns[8]);
- memcpy (p->ainsn.insn, insns, sizeof(insns));
- flush_icache_range((long unsigned)p->ainsn.insn, (long unsigned)(p->ainsn.insn) + sizeof(insns));
-#ifdef BOARD_tegra
- flush_cache_all();
-#endif
- }
- }
- else
- {
- free_insn_slot(&kprobe_insn_pages, NULL, p->ainsn.insn);
- printk("arch_prepare_kprobe: instruction 0x%lx not instrumentation, addr=0x%p\n", insn[0], p->addr);
- }
-
- return ret;
-}
-
-static unsigned int arch_construct_brunch (unsigned int base, unsigned int addr, int link)
-{
- kprobe_opcode_t insn;
- unsigned int bpi = (unsigned int) base - (unsigned int) addr - 8;
-
- insn = bpi >> 2;
- DBPRINTF ("base=%x addr=%x base-addr-8=%x\n", base, addr, bpi);
- if (abs (insn & 0xffffff) > 0xffffff)
- {
- DBPRINTF ("ERROR: kprobe address out of range\n");
- BUG ();
- }
- insn = insn & 0xffffff;
- insn = insn | ((link != 0) ? 0xeb000000 : 0xea000000);
- DBPRINTF ("insn=%lX\n", insn);
- return (unsigned int) insn;
-}
+ kprobe_opcode_t insn[MAX_INSN_SIZE];
+ struct arch_specific_insn ainsn;
+ /* insn: must be on special executable page on i386. */
+ p->ainsn.insn = alloc_insn_slot(sm);
+ if (!p->ainsn.insn)
+ return -ENOMEM;
-int arch_copy_trampoline_arm_uprobe (struct kprobe *p, struct task_struct *task, int atomic);
-int arch_copy_trampoline_thumb_uprobe (struct kprobe *p, struct task_struct *task, int atomic);
+ memcpy(insn, p->addr, MAX_INSN_SIZE * sizeof(kprobe_opcode_t));
+ ainsn.insn_arm = ainsn.insn = insn;
+ ret = arch_check_insn_arm(&ainsn);
+ if (!ret) {
+ p->opcode = *p->addr;
+ uregs = pc_dep = 0;
+
+ // Rn, Rm ,Rd
+ if (ARM_INSN_MATCH(DPIS, insn[0]) || ARM_INSN_MATCH(LRO, insn[0]) ||
+ ARM_INSN_MATCH(SRO, insn[0])) {
+ uregs = 0xb;
+ if ((ARM_INSN_REG_RN(insn[0]) == 15) || (ARM_INSN_REG_RM(insn[0]) == 15) ||
+ (ARM_INSN_MATCH(SRO, insn[0]) && (ARM_INSN_REG_RD(insn[0]) == 15))) {
+ DBPRINTF ("Unboostable insn %lx, DPIS/LRO/SRO\n", insn[0]);
+ pc_dep = 1;
+ }
-int arch_prepare_uprobe (struct kprobe *p, struct task_struct *task, int atomic)
-{
- int ret = 0;
- kprobe_opcode_t insn[MAX_INSN_SIZE];
+ // Rn ,Rd
+ } else if( ARM_INSN_MATCH(DPI, insn[0]) || ARM_INSN_MATCH(LIO, insn[0]) ||
+ ARM_INSN_MATCH(SIO, insn[0])) {
+ uregs = 0x3;
+ if ((ARM_INSN_REG_RN(insn[0]) == 15) || (ARM_INSN_MATCH(SIO, insn[0]) &&
+ (ARM_INSN_REG_RD (insn[0]) == 15))) {
+ pc_dep = 1;
+ DBPRINTF ("Unboostable insn %lx/%p, DPI/LIO/SIO\n", insn[0], p);
+ }
+ // Rn, Rm, Rs
+ } else if (ARM_INSN_MATCH(DPRS, insn[0])) {
+ uregs = 0xd;
+ if ((ARM_INSN_REG_RN(insn[0]) == 15) || (ARM_INSN_REG_RM(insn[0]) == 15) ||
+ (ARM_INSN_REG_RS (insn[0]) == 15)) {
+ pc_dep = 1;
+ DBPRINTF ("Unboostable insn %lx, DPRS\n", insn[0]);
+ }
+ // register list
+ } else if(ARM_INSN_MATCH(SM, insn[0])) {
+ uregs = 0x10;
+ if (ARM_INSN_REG_MR(insn[0], 15)) {
+ DBPRINTF ("Unboostable insn %lx, SM\n", insn[0]);
+ pc_dep = 1;
+ }
+ }
- if ((unsigned long) p->addr & 0x01)
- {
- printk("Error in %s at %d: attempt to register kprobe at an unaligned address\n", __FILE__, __LINE__);
- return -EINVAL;
- }
- if (!read_proc_vm_atomic (task, (unsigned long) p->addr, &insn, MAX_INSN_SIZE * sizeof(kprobe_opcode_t)))
- panic ("Failed to read memory %p!\n", p->addr);
- p->opcode = insn[0];
- p->ainsn.insn_arm = get_insn_slot(task, atomic);
- if (!p->ainsn.insn_arm) {
- printk("Error in %s at %d: kprobe slot allocation error (arm)\n", __FILE__, __LINE__);
- return -ENOMEM;
- }
- ret = arch_copy_trampoline_arm_uprobe(p, task, 1);
- if (ret) {
- free_insn_slot(&uprobe_insn_pages, task, p->ainsn.insn_arm);
- return -EFAULT;
- }
- p->ainsn.insn_thumb = get_insn_slot(task, atomic);
- if (!p->ainsn.insn_thumb) {
- printk("Error in %s at %d: kprobe slot allocation error (thumb)\n", __FILE__, __LINE__);
- return -ENOMEM;
- }
- ret = arch_copy_trampoline_thumb_uprobe(p, task, 1);
- if (ret) {
- free_insn_slot(&uprobe_insn_pages, task, p->ainsn.insn_arm);
- free_insn_slot(&uprobe_insn_pages, task, p->ainsn.insn_thumb);
- return -EFAULT;
- }
- if ((p->safe_arm == -1) && (p->safe_thumb == -1)) {
- printk("Error in %s at %d: failed arch_copy_trampoline_*_uprobe() (both) [tgid=%u, addr=%x, data=%x]\n",
- __FILE__, __LINE__, task->tgid, p->addr, p->opcode);
- if (!write_proc_vm_atomic (task, (unsigned long) p->addr, &p->opcode, sizeof (p->opcode)))
- panic ("Failed to write memory %p!\n", p->addr);
- free_insn_slot(&uprobe_insn_pages, task, p->ainsn.insn_arm);
- free_insn_slot(&uprobe_insn_pages, task, p->ainsn.insn_thumb);
- return -EFAULT;
+ // check instructions that can write result to SP andu uses PC
+ if (pc_dep && (ARM_INSN_REG_RD(ainsn.insn[0]) == 13)) {
+ free_insn_slot(sm, p->ainsn.insn);
+ ret = -EFAULT;
+ } else {
+ if (uregs && pc_dep) {
+ memcpy(insns, pc_dep_insn_execbuf, sizeof(insns));
+ if (prep_pc_dep_insn_execbuf(insns, insn[0], uregs) != 0) {
+ DBPRINTF ("failed to prepare exec buffer for insn %lx!", insn[0]);
+ free_insn_slot(sm, p->ainsn.insn);
+ return -EINVAL;
+ }
+ insns[6] = (kprobe_opcode_t)(p->addr + 2);
+ } else {
+ memcpy(insns, gen_insn_execbuf, sizeof(insns));
+ insns[KPROBES_TRAMP_INSN_IDX] = insn[0];
+ }
+ insns[7] = (kprobe_opcode_t)(p->addr + 1);
+ DBPRINTF ("arch_prepare_kprobe: insn %lx", insn[0]);
+ DBPRINTF ("arch_prepare_kprobe: to %p - %lx %lx %lx %lx %lx %lx %lx %lx %lx",
+ p->ainsn.insn, insns[0], insns[1], insns[2], insns[3], insns[4],
+ insns[5], insns[6], insns[7], insns[8]);
+ memcpy(p->ainsn.insn, insns, sizeof(insns));
+ flush_icache_range((long unsigned)p->ainsn.insn, (long unsigned)(p->ainsn.insn) + sizeof(insns));
+#ifdef BOARD_tegra
+ flush_cache_all();
+#endif
+ }
+ } else {
+ free_insn_slot(sm, p->ainsn.insn);
+ printk("arch_prepare_kprobe: instruction 0x%lx not instrumentation, addr=0x%p\n", insn[0], p->addr);
}
- return ret;
-}
-int arch_prepare_uretprobe (struct kretprobe *p, struct task_struct *task)
-{
- DBPRINTF("Warrning: arch_prepare_uretprobe is not implemented\n");
- return 0;
+ return ret;
}
-void prepare_singlestep (struct kprobe *p, struct pt_regs *regs)
+void prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
{
if (p->ss_addr) {
regs->ARM_pc = (unsigned long)p->ss_addr;
regs->ARM_pc = (unsigned long)p->ainsn.insn;
}
}
+EXPORT_SYMBOL_GPL(prepare_singlestep);
void save_previous_kprobe(struct kprobe_ctlblk *kcb, struct kprobe *p_run)
{
- if (p_run == NULL) {
- panic("arm_save_previous_kprobe: p_run == NULL\n");
- }
-
- if (kcb->prev_kprobe.kp != NULL) {
- DBPRINTF ("no space to save new probe[]: task = %d/%s", current->pid, current->comm);
- }
-
- kcb->prev_kprobe.kp = p_run;
+ kcb->prev_kprobe.kp = kprobe_running();
kcb->prev_kprobe.status = kcb->kprobe_status;
}
void restore_previous_kprobe(struct kprobe_ctlblk *kcb)
{
- set_current_kprobe(kcb->prev_kprobe.kp, NULL, NULL);
+ __get_cpu_var(current_kprobe) = kcb->prev_kprobe.kp;
kcb->kprobe_status = kcb->prev_kprobe.status;
- kcb->prev_kprobe.kp = NULL;
- kcb->prev_kprobe.status = 0;
}
void set_current_kprobe(struct kprobe *p, struct pt_regs *regs, struct kprobe_ctlblk *kcb)
DBPRINTF ("set_current_kprobe: p=%p addr=%p\n", p, p->addr);
}
-int arch_copy_trampoline_arm_uprobe (struct kprobe *p, struct task_struct *task, int atomic)
-{
- kprobe_opcode_t insns[UPROBES_TRAMP_LEN];
- int uregs, pc_dep;
- kprobe_opcode_t insn[MAX_INSN_SIZE];
- struct arch_specific_insn ainsn;
-
- p->safe_arm = -1;
- if ((unsigned long) p->addr & 0x01)
- {
- printk("Error in %s at %d: attempt to register kprobe at an unaligned address\n", __FILE__, __LINE__);
- return -EINVAL;
- }
- insn[0] = p->opcode;
- ainsn.insn_arm = insn;
- if (!arch_check_insn_arm(&ainsn))
- {
- p->safe_arm = 0;
- }
- uregs = pc_dep = 0;
- // Rn, Rm ,Rd
- if (ARM_INSN_MATCH (DPIS, insn[0]) || ARM_INSN_MATCH (LRO, insn[0]) ||
- ARM_INSN_MATCH (SRO, insn[0]))
- {
- uregs = 0xb;
- if ((ARM_INSN_REG_RN (insn[0]) == 15) || (ARM_INSN_REG_RM (insn[0]) == 15) ||
- (ARM_INSN_MATCH (SRO, insn[0]) && (ARM_INSN_REG_RD (insn[0]) == 15)))
- {
- DBPRINTF ("Unboostable insn %lx, DPIS/LRO/SRO\n", insn[0]);
- pc_dep = 1;
- }
- }
- // Rn ,Rd
- else if (ARM_INSN_MATCH (DPI, insn[0]) || ARM_INSN_MATCH (LIO, insn[0]) ||
- ARM_INSN_MATCH (SIO, insn[0]))
- {
- uregs = 0x3;
- if ((ARM_INSN_REG_RN (insn[0]) == 15) || (ARM_INSN_MATCH (SIO, insn[0]) &&
- (ARM_INSN_REG_RD (insn[0]) == 15)))
- {
- pc_dep = 1;
- DBPRINTF ("Unboostable insn %lx/%p, DPI/LIO/SIO\n", insn[0], p);
- }
- }
- // Rn, Rm, Rs
- else if (ARM_INSN_MATCH (DPRS, insn[0]))
- {
- uregs = 0xd;
- if ((ARM_INSN_REG_RN (insn[0]) == 15) || (ARM_INSN_REG_RM (insn[0]) == 15) ||
- (ARM_INSN_REG_RS (insn[0]) == 15))
- {
- pc_dep = 1;
- DBPRINTF ("Unboostable insn %lx, DPRS\n", insn[0]);
- }
- }
- // register list
- else if (ARM_INSN_MATCH (SM, insn[0]))
- {
- uregs = 0x10;
- if (ARM_INSN_REG_MR (insn[0], 15))
- {
- DBPRINTF ("Unboostable insn %lx, SM\n", insn[0]);
- pc_dep = 1;
- }
- }
- // check instructions that can write result to SP andu uses PC
- if (pc_dep && (ARM_INSN_REG_RD (ainsn.insn_arm[0]) == 13))
- {
- printk("Error in %s at %d: instruction check failed (arm)\n", __FILE__, __LINE__);
- p->safe_arm = -1;
- // TODO: move free to later phase
- //free_insn_slot (&uprobe_insn_pages, task, p->ainsn.insn_arm, 0);
- //ret = -EFAULT;
- }
- if (unlikely(uregs && pc_dep))
- {
- memcpy (insns, pc_dep_insn_execbuf, sizeof (insns));
- if (prep_pc_dep_insn_execbuf (insns, insn[0], uregs) != 0)
- {
- printk("Error in %s at %d: failed to prepare exec buffer for insn %lx!",
- __FILE__, __LINE__, insn[0]);
- p->safe_arm = -1;
- // TODO: move free to later phase
- //free_insn_slot (&uprobe_insn_pages, task, p->ainsn.insn_arm, 0);
- //return -EINVAL;
- }
- //insns[UPROBES_TRAMP_SS_BREAK_IDX] = BREAKPOINT_INSTRUCTION;
- insns[6] = (kprobe_opcode_t) (p->addr + 2);
- }
- else
- {
- memcpy (insns, gen_insn_execbuf, sizeof (insns));
- insns[UPROBES_TRAMP_INSN_IDX] = insn[0];
- }
- insns[UPROBES_TRAMP_RET_BREAK_IDX] = BREAKPOINT_INSTRUCTION;
- insns[7] = (kprobe_opcode_t) (p->addr + 1);
-
- // B
- if(ARM_INSN_MATCH (B, ainsn.insn_arm[0]))
- {
- memcpy (insns, pc_dep_insn_execbuf, sizeof (insns));
- insns[UPROBES_TRAMP_RET_BREAK_IDX] = BREAKPOINT_INSTRUCTION;
- insns[6] = (kprobe_opcode_t) (p->addr + 2);
- insns[7] = get_addr_b(p->opcode, p->addr);
- }
-
- DBPRINTF ("arch_prepare_uprobe: to %p - %lx %lx %lx %lx %lx %lx %lx %lx %lx",
- p->ainsn.insn_arm, insns[0], insns[1], insns[2], insns[3], insns[4],
- insns[5], insns[6], insns[7], insns[8]);
- if (!write_proc_vm_atomic (task, (unsigned long) p->ainsn.insn_arm, insns, sizeof (insns)))
- {
- panic("failed to write memory %p!\n", p->ainsn.insn);
- // Mr_Nobody: we have to panic, really??...
- //free_insn_slot (&uprobe_insn_pages, task, p->ainsn.insn_arm, 0);
- //return -EINVAL;
- }
- return 0;
-}
-
-int arch_copy_trampoline_thumb_uprobe (struct kprobe *p, struct task_struct *task, int atomic)
+static int kprobe_handler(struct pt_regs *regs)
{
- int uregs, pc_dep;
- unsigned int addr;
- kprobe_opcode_t insn[MAX_INSN_SIZE];
- struct arch_specific_insn ainsn;
- kprobe_opcode_t insns[UPROBES_TRAMP_LEN * 2];
-
- p->safe_thumb = -1;
- if ((unsigned long) p->addr & 0x01)
- {
- printk("Error in %s at %d: attempt to register kprobe at an unaligned address\n", __FILE__, __LINE__);
- return -EINVAL;
- }
- insn[0] = p->opcode;
- ainsn.insn_thumb = insn;
- if (!arch_check_insn_thumb(&ainsn))
- {
- p->safe_thumb = 0;
- }
- uregs = 0;
- pc_dep = 0;
- if (THUMB_INSN_MATCH (APC, insn[0]) || THUMB_INSN_MATCH (LRO3, insn[0]))
- {
- uregs = 0x0700; // 8-10
- pc_dep = 1;
- }
- else if (THUMB_INSN_MATCH (MOV3, insn[0]) && (((((unsigned char) insn[0]) & 0xff) >> 3) == 15))
- {
- // MOV Rd, PC
- uregs = 0x07;
- pc_dep = 1;
- }
- else if THUMB2_INSN_MATCH (ADR, insn[0])
- {
- uregs = 0x0f00; // Rd 8-11
- pc_dep = 1;
- }
- else if (((THUMB2_INSN_MATCH (LDRW, insn[0]) || THUMB2_INSN_MATCH (LDRW1, insn[0]) ||
- THUMB2_INSN_MATCH (LDRBW, insn[0]) || THUMB2_INSN_MATCH (LDRBW1, insn[0]) ||
- THUMB2_INSN_MATCH (LDRHW, insn[0]) || THUMB2_INSN_MATCH (LDRHW1, insn[0]) ||
- THUMB2_INSN_MATCH (LDRWL, insn[0])) && THUMB2_INSN_REG_RN(insn[0]) == 15) ||
- THUMB2_INSN_MATCH (LDREX, insn[0]) ||
- ((THUMB2_INSN_MATCH (STRW, insn[0]) || THUMB2_INSN_MATCH (STRBW, insn[0]) ||
- THUMB2_INSN_MATCH (STRHW, insn[0]) || THUMB2_INSN_MATCH (STRHW1, insn[0])) &&
- (THUMB2_INSN_REG_RN(insn[0]) == 15 || THUMB2_INSN_REG_RT(insn[0]) == 15)) ||
- ((THUMB2_INSN_MATCH (STRT, insn[0]) || THUMB2_INSN_MATCH (STRHT, insn[0])) &&
- (THUMB2_INSN_REG_RN(insn[0]) == 15 || THUMB2_INSN_REG_RT(insn[0]) == 15)) )
- {
- uregs = 0xf000; // Rt 12-15
- pc_dep = 1;
- }
- else if ((THUMB2_INSN_MATCH (LDRD, insn[0]) || THUMB2_INSN_MATCH (LDRD1, insn[0])) && (THUMB2_INSN_REG_RN(insn[0]) == 15))
- {
- uregs = 0xff00; // Rt 12-15, Rt2 8-11
- pc_dep = 1;
- }
- else if (THUMB2_INSN_MATCH (MUL, insn[0]) && THUMB2_INSN_REG_RM(insn[0]) == 15)
- {
- uregs = 0xf;
- pc_dep = 1;
- }
- else if (THUMB2_INSN_MATCH (DP, insn[0]) && (THUMB2_INSN_REG_RN(insn[0]) == 15 || THUMB2_INSN_REG_RM(insn[0]) == 15))
- {
- uregs = 0xf000; // Rd 12-15
- pc_dep = 1;
- }
- else if (THUMB2_INSN_MATCH(STRD, insn[0]) && ((THUMB2_INSN_REG_RN(insn[0]) == 15) || (THUMB2_INSN_REG_RT(insn[0]) == 15) || THUMB2_INSN_REG_RT2(insn[0]) == 15))
- {
- uregs = 0xff00; // Rt 12-15, Rt2 8-11
- pc_dep = 1;
- }
- else if (THUMB2_INSN_MATCH (RSBW, insn[0]) && THUMB2_INSN_REG_RN(insn[0]) == 15)
- {
- uregs = 0x0f00; // Rd 8-11
- pc_dep = 1;
- }
- else if (THUMB2_INSN_MATCH (RORW, insn[0]) && (THUMB2_INSN_REG_RN(insn[0]) == 15 || THUMB2_INSN_REG_RM(insn[0]) == 15))
- {
- uregs = 0x0f00;
- pc_dep = 1;
- }
- else if ((THUMB2_INSN_MATCH (ROR, insn[0]) || THUMB2_INSN_MATCH(LSLW2, insn[0]) || THUMB2_INSN_MATCH(LSRW2, insn[0])) && THUMB2_INSN_REG_RM(insn[0]) == 15)
- {
- uregs = 0x0f00; // Rd 8-11
- pc_dep = 1;
- }
- else if ((THUMB2_INSN_MATCH (LSLW1, insn[0]) || THUMB2_INSN_MATCH (LSRW1, insn[0])) && (THUMB2_INSN_REG_RN(insn[0]) == 15 || THUMB2_INSN_REG_RM(insn[0]) == 15))
- {
- uregs = 0x0f00; // Rd 8-11
- pc_dep = 1;
- }
- else if ((THUMB2_INSN_MATCH (TEQ1, insn[0]) || THUMB2_INSN_MATCH (TST1, insn[0])) && THUMB2_INSN_REG_RN(insn[0]) == 15)
- {
- uregs = 0xf0000; //Rn 0-3 (16-19)
- pc_dep = 1;
- }
- else if ((THUMB2_INSN_MATCH (TEQ2, insn[0]) || THUMB2_INSN_MATCH (TST2, insn[0])) &&
- (THUMB2_INSN_REG_RN(insn[0]) == 15 || THUMB2_INSN_REG_RM(insn[0]) == 15))
- {
- uregs = 0xf0000; //Rn 0-3 (16-19)
- pc_dep = 1;
- }
- if (unlikely(uregs && pc_dep))
- {
- memcpy (insns, pc_dep_insn_execbuf_thumb, 18 * 2);
- if (prep_pc_dep_insn_execbuf_thumb (insns, insn[0], uregs) != 0)
- {
- printk("Error in %s at %d: failed to prepare exec buffer for insn %lx!",
- __FILE__, __LINE__, insn[0]);
- p->safe_thumb = -1;
- //free_insn_slot (&uprobe_insn_pages, task, p->ainsn.insn_thumb, 0);
- //return -EINVAL;
- }
- addr = ((unsigned int)p->addr) + 4;
- *((unsigned short*)insns + 13) = 0xdeff;
- *((unsigned short*)insns + 14) = addr & 0x0000ffff;
- *((unsigned short*)insns + 15) = addr >> 16;
- if (!isThumb2(insn[0]))
- {
- addr = ((unsigned int)p->addr) + 2;
- *((unsigned short*)insns + 16) = (addr & 0x0000ffff) | 0x1;
- *((unsigned short*)insns + 17) = addr >> 16;
- }
- else {
- addr = ((unsigned int)p->addr) + 4;
- *((unsigned short*)insns + 16) = (addr & 0x0000ffff) | 0x1;
- *((unsigned short*)insns + 17) = addr >> 16;
- }
- }
- else {
- memcpy (insns, gen_insn_execbuf_thumb, 18 * 2);
- *((unsigned short*)insns + 13) = 0xdeff;
- if (!isThumb2(insn[0]))
- {
- addr = ((unsigned int)p->addr) + 2;
- *((unsigned short*)insns + 2) = insn[0];
- *((unsigned short*)insns + 16) = (addr & 0x0000ffff) | 0x1;
- *((unsigned short*)insns + 17) = addr >> 16;
- }
- else {
- addr = ((unsigned int)p->addr) + 4;
- insns[1] = insn[0];
- *((unsigned short*)insns + 16) = (addr & 0x0000ffff) | 0x1;
- *((unsigned short*)insns + 17) = addr >> 16;
- }
- }
- if (!write_proc_vm_atomic (task, (unsigned long) p->ainsn.insn_thumb, insns, 18 * 2))
- {
- panic("failed to write memory %p!\n", p->ainsn.insn_thumb);
- // Mr_Nobody: we have to panic, really??...
- //free_insn_slot (&uprobe_insn_pages, task, p->ainsn.insn_thumb, 0);
- //return -EINVAL;
- }
- return 0;
-}
-
-static int check_validity_insn(struct kprobe *p, struct pt_regs *regs, struct task_struct *task)
-{
- struct kprobe *kp;
+ struct kprobe *p, *cur;
+ struct kprobe_ctlblk *kcb;
- if (unlikely(thumb_mode(regs))) {
- if (p->safe_thumb != -1) {
- p->ainsn.insn = p->ainsn.insn_thumb;
- list_for_each_entry_rcu(kp, &p->list, list) {
- kp->ainsn.insn = p->ainsn.insn_thumb;
+ kcb = get_kprobe_ctlblk();
+ cur = kprobe_running();
+ p = get_kprobe((void *)regs->ARM_pc);
+
+ if (p) {
+ if (cur) {
+ /* Kprobe is pending, so we're recursing. */
+ switch (kcb->kprobe_status) {
+ case KPROBE_HIT_ACTIVE:
+ case KPROBE_HIT_SSDONE:
+ /* A pre- or post-handler probe got us here. */
+ kprobes_inc_nmissed_count(p);
+ save_previous_kprobe(kcb, NULL);
+ set_current_kprobe(p, 0, 0);
+ kcb->kprobe_status = KPROBE_REENTER;
+ prepare_singlestep(p, regs);
+ restore_previous_kprobe(kcb);
+ break;
+ default:
+ /* impossible cases */
+ BUG();
}
} else {
- printk("Error in %s at %d: we are in thumb mode (!) and check instruction was fail \
- (%0lX instruction at %p address)!\n", __FILE__, __LINE__, p->opcode, p->addr);
- // Test case when we do our actions on already running application
- arch_disarm_uprobe(p, task);
- return -1;
- }
- } else {
- if (p->safe_arm != -1) {
- p->ainsn.insn = p->ainsn.insn_arm;
- list_for_each_entry_rcu(kp, &p->list, list) {
- kp->ainsn.insn = p->ainsn.insn_arm;
+ set_current_kprobe(p, 0, 0);
+ kcb->kprobe_status = KPROBE_HIT_ACTIVE;
+
+ if (!p->pre_handler || !p->pre_handler(p, regs)) {
+ kcb->kprobe_status = KPROBE_HIT_SS;
+ prepare_singlestep(p, regs);
+ reset_current_kprobe();
}
- } else {
- printk("Error in %s at %d: we are in arm mode (!) and check instruction was fail \
- (%0lX instruction at %p address)!\n", __FILE__, __LINE__, p->opcode, p->addr);
- // Test case when we do our actions on already running application
- arch_disarm_uprobe(p, task);
- return -1;
}
+ } else {
+ goto no_kprobe;
}
return 0;
-}
-static int kprobe_trap_handler(struct pt_regs *regs, unsigned int instr)
-{
- int ret;
- unsigned long flags;
- local_irq_save(flags);
- ret = kprobe_handler(regs);
- local_irq_restore(flags);
- return ret;
+no_kprobe:
+ printk("no_kprobe\n");
+ return 1;
}
-int kprobe_handler(struct pt_regs *regs)
+int kprobe_trap_handler(struct pt_regs *regs, unsigned int instr)
{
- int err_out = 0;
- char *msg_out = NULL;
- unsigned long user_m = user_mode(regs);
- pid_t tgid = (user_m) ? current->tgid : 0;
- kprobe_opcode_t *addr = (kprobe_opcode_t *) (regs->ARM_pc);
-
- struct kprobe *p = NULL, *p_run = NULL;
- int ret = 0, retprobe = 0, reenter = 0;
- kprobe_opcode_t *ssaddr = 0;
- struct kprobe_ctlblk *kcb;
+ int ret;
+ unsigned long flags;
#ifdef SUPRESS_BUG_MESSAGES
int swap_oops_in_progress;
- // oops_in_progress used to avoid BUG() messages that slow down kprobe_handler() execution
+ /* oops_in_progress used to avoid BUG() messages
+ * that slow down kprobe_handler() execution */
swap_oops_in_progress = oops_in_progress;
oops_in_progress = 1;
#endif
-#ifdef OVERHEAD_DEBUG
- struct timeval swap_tv1;
- struct timeval swap_tv2;
-#define USEC_IN_SEC_NUM 1000000
- do_gettimeofday(&swap_tv1);
-#endif
- preempt_disable();
-
-// printk("### kprobe_handler: task[tgid=%u (%s)] addr=%p\n", tgid, current->comm, addr);
- p = get_kprobe(addr, tgid);
-
- if (user_m && p && (check_validity_insn(p, regs, current) != 0)) {
- goto no_kprobe_live;
- }
- /* We're in an interrupt, but this is clear and BUG()-safe. */
- kcb = get_kprobe_ctlblk ();
-
- /* Check we're not actually recursing */
- // TODO: event is not saving in trace
- p_run = kprobe_running();
- if (p_run)
- {
- DBPRINTF("lock???");
- if (p)
- {
- if (!tgid && (addr == (kprobe_opcode_t *)kretprobe_trampoline)) {
- save_previous_kprobe(kcb, p_run);
- kcb->kprobe_status = KPROBE_REENTER;
- reenter = 1;
- } else {
- /* We have reentered the kprobe_handler(), since
- * another probe was hit while within the handler.
- * We here save the original kprobes variables and
- * just single step on the instruction of the new probe
- * without calling any user handlers.
- */
- kprobes_inc_nmissed_count (p);
- prepare_singlestep (p, regs);
-
- err_out = 0;
- goto out;
- }
- } else {
- if(tgid) { //we can reenter probe upon uretprobe exception
- DBPRINTF ("check for UNDEF_INSTRUCTION %p\n", addr);
- // UNDEF_INSTRUCTION from user space
-
- p = get_kprobe_by_insn_slot(addr, tgid, regs);
- if (p) {
- save_previous_kprobe(kcb, p_run);
- kcb->kprobe_status = KPROBE_REENTER;
- reenter = 1;
- retprobe = 1;
- DBPRINTF ("uretprobe %p\n", addr);
- }
- }
- if(!p) {
- p = p_run;
- DBPRINTF ("kprobe_running !!! p = 0x%p p->break_handler = 0x%p", p, p->break_handler);
- /*if (p->break_handler && p->break_handler(p, regs)) {
- DBPRINTF("kprobe_running !!! goto ss");
- goto ss_probe;
- } */
- DBPRINTF ("unknown uprobe at %p cur at %p/%p\n", addr, p->addr, p->ainsn.insn);
- if (tgid)
- ssaddr = p->ainsn.insn + UPROBES_TRAMP_SS_BREAK_IDX;
- else
- ssaddr = p->ainsn.insn + KPROBES_TRAMP_SS_BREAK_IDX;
- if (addr == ssaddr) {
- regs->ARM_pc = (unsigned long) (p->addr + 1);
- DBPRINTF ("finish step at %p cur at %p/%p, redirect to %lx\n", addr, p->addr, p->ainsn.insn, regs->ARM_pc);
- if (kcb->kprobe_status == KPROBE_REENTER) {
- restore_previous_kprobe(kcb);
- } else {
- reset_current_kprobe();
- }
- }
- DBPRINTF ("kprobe_running !!! goto no");
- ret = 1;
- /* If it's not ours, can't be delete race, (we hold lock). */
- DBPRINTF ("no_kprobe");
- goto no_kprobe;
- }
- }
- }
-
- if (!p) {
- if (tgid) {
- DBPRINTF ("search UNDEF_INSTRUCTION %p\n", addr);
- // UNDEF_INSTRUCTION from user space
-
- p = get_kprobe_by_insn_slot(addr, tgid, regs);
- if (!p) {
- /* Not one of ours: let kernel handle it */
- DBPRINTF ("no_kprobe");
- goto no_kprobe;
- }
- retprobe = 1;
- DBPRINTF ("uretprobe %p\n", addr);
- } else {
- /* Not one of ours: let kernel handle it */
- DBPRINTF ("no_kprobe");
- goto no_kprobe;
- }
- }
- // restore opcode for thumb app
- if (user_mode( regs ) && thumb_mode( regs )) {
- if (!isThumb2(p->opcode)) {
- unsigned long tmp = p->opcode >> 16;
- write_proc_vm_atomic(current, (unsigned long)((unsigned short*)p->addr + 1), &tmp, 2);
- } else {
- unsigned long tmp = p->opcode;
- write_proc_vm_atomic(current, (unsigned long)((unsigned short*)p->addr), &tmp, 4);
- }
- flush_icache_range ((unsigned int) p->addr, (unsigned int) (((unsigned int) p->addr) + (sizeof (kprobe_opcode_t) * 2)));
- }
- set_current_kprobe(p, NULL, NULL);
- if(!reenter)
- kcb->kprobe_status = KPROBE_HIT_ACTIVE;
- if (retprobe) { //(einsn == UNDEF_INSTRUCTION)
- ret = trampoline_probe_handler (p, regs);
- } else if (p->pre_handler) {
- ret = p->pre_handler (p, regs);
- if(p->pre_handler != trampoline_probe_handler) {
- reset_current_kprobe();
- }
- }
-
- if (ret) {
- /* handler has already set things up, so skip ss setup */
- err_out = 0;
- goto out;
- }
-
-no_kprobe:
- msg_out = "no_kprobe\n";
- err_out = 1; // return with death
- goto out;
-
-no_kprobe_live:
- msg_out = "no_kprobe live\n";
- err_out = 0; // ok - life is life
- goto out;
-
-out:
+ local_irq_save(flags);
+ preempt_disable();
+ ret = kprobe_handler(regs);
preempt_enable_no_resched();
-#ifdef OVERHEAD_DEBUG
- do_gettimeofday(&swap_tv2);
- swap_sum_hit++;
- swap_sum_time += ((swap_tv2.tv_sec - swap_tv1.tv_sec) * USEC_IN_SEC_NUM +
- (swap_tv2.tv_usec - swap_tv1.tv_usec));
-#endif
+ local_irq_restore(flags);
+
#ifdef SUPRESS_BUG_MESSAGES
oops_in_progress = swap_oops_in_progress;
#endif
- if(msg_out) {
- printk(msg_out);
- }
-
- return err_out;
+ return ret;
}
-int setjmp_pre_handler (struct kprobe *p, struct pt_regs *regs)
+int setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
{
- struct jprobe *jp = container_of (p, struct jprobe, kp);
- kprobe_pre_entry_handler_t pre_entry;
- entry_point_t entry;
-
-# ifdef REENTER
-// p = kprobe_running(regs);
-# endif
-
- DBPRINTF ("pjp = 0x%p jp->entry = 0x%p", jp, jp->entry);
- entry = (entry_point_t) jp->entry;
- pre_entry = (kprobe_pre_entry_handler_t) jp->pre_entry;
- //if(!entry)
- // DIE("entry NULL", regs)
- DBPRINTF ("entry = 0x%p jp->entry = 0x%p", entry, jp->entry);
-
- //call handler for all kernel probes and user space ones which belong to current tgid
- if (!p->tgid || (p->tgid == current->tgid))
- {
- if(!p->tgid && ((unsigned int)p->addr == sched_addr) && sched_rp) {
- patch_suspended_all_task_ret_addr(sched_rp);
- }
- if (pre_entry)
- p->ss_addr = (void *)pre_entry (jp->priv_arg, regs);
- if (entry){
- entry (regs->ARM_r0, regs->ARM_r1, regs->ARM_r2, regs->ARM_r3, regs->ARM_r4, regs->ARM_r5);
- }
- else {
- if (p->tgid)
- dbi_arch_uprobe_return ();
- else
- dbi_jprobe_return ();
- }
+ struct jprobe *jp = container_of(p, struct jprobe, kp);
+ kprobe_pre_entry_handler_t pre_entry = (kprobe_pre_entry_handler_t)jp->pre_entry;
+ entry_point_t entry = (entry_point_t)jp->entry;
+ pre_entry = (kprobe_pre_entry_handler_t)jp->pre_entry;
+
+ if (((unsigned long)p->addr == sched_addr) && sched_rp) {
+ struct thread_info *tinfo = (struct thread_info *)regs->ARM_r2;
+ patch_suspended_task(sched_rp, tinfo->task);
}
- else if (p->tgid)
- dbi_arch_uprobe_return ();
- prepare_singlestep (p, regs);
+ if (pre_entry) {
+ p->ss_addr = (void *)pre_entry (jp->priv_arg, regs);
+ }
- return 1;
-}
+ if (entry) {
+ entry(regs->ARM_r0, regs->ARM_r1, regs->ARM_r2,
+ regs->ARM_r3, regs->ARM_r4, regs->ARM_r5);
+ } else {
+ dbi_jprobe_return();
+ }
-void dbi_jprobe_return (void)
-{
+ return 0;
}
-void dbi_arch_uprobe_return (void)
+void dbi_jprobe_return (void)
{
}
int longjmp_break_handler (struct kprobe *p, struct pt_regs *regs)
{
-# ifndef REENTER
- //kprobe_opcode_t insn = BREAKPOINT_INSTRUCTION;
- kprobe_opcode_t insns[2];
-
- if (p->pid)
- {
- insns[0] = BREAKPOINT_INSTRUCTION;
- insns[1] = p->opcode;
- //p->opcode = *p->addr;
- if (read_proc_vm_atomic (current, (unsigned long) (p->addr), &(p->opcode), sizeof (p->opcode)) < sizeof (p->opcode))
- {
- printk ("ERROR[%lu]: failed to read vm of proc %s/%u addr %p.", nCount, current->comm, current->pid, p->addr);
- return -1;
- }
- //*p->addr = BREAKPOINT_INSTRUCTION;
- //*(p->addr+1) = p->opcode;
- if (write_proc_vm_atomic (current, (unsigned long) (p->addr), insns, sizeof (insns)) < sizeof (insns))
- {
- printk ("ERROR[%lu]: failed to write vm of proc %s/%u addr %p.", nCount, current->comm, current->pid, p->addr);
- return -1;
- }
- }
- else
- {
- DBPRINTF ("p->opcode = 0x%lx *p->addr = 0x%lx p->addr = 0x%p\n", p->opcode, *p->addr, p->addr);
- *(p->addr + 1) = p->opcode;
- p->opcode = *p->addr;
- *p->addr = BREAKPOINT_INSTRUCTION;
-
- flush_icache_range ((unsigned int) p->addr, (unsigned int) (((unsigned int) p->addr) + (sizeof (kprobe_opcode_t) * 2)));
- }
-
- reset_current_kprobe();
-
-#endif //REENTER
-
return 0;
}
+EXPORT_SYMBOL_GPL(longjmp_break_handler);
-
-void arch_arm_kprobe (struct kprobe *p)
+void arch_arm_kprobe(struct kprobe *p)
{
*p->addr = BREAKPOINT_INSTRUCTION;
- flush_icache_range ((unsigned long) p->addr, (unsigned long) p->addr + sizeof (kprobe_opcode_t));
+ flush_icache_range((unsigned long)p->addr, (unsigned long)p->addr + sizeof(kprobe_opcode_t));
}
-void arch_disarm_kprobe (struct kprobe *p)
+void arch_disarm_kprobe(struct kprobe *p)
{
*p->addr = p->opcode;
- flush_icache_range ((unsigned long) p->addr, (unsigned long) p->addr + sizeof (kprobe_opcode_t));
+ flush_icache_range((unsigned long)p->addr, (unsigned long)p->addr + sizeof(kprobe_opcode_t));
}
-
-int trampoline_probe_handler (struct kprobe *p, struct pt_regs *regs)
+int trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
{
struct kretprobe_instance *ri = NULL;
struct hlist_head *head;
struct hlist_node *node, *tmp;
unsigned long flags, orig_ret_address = 0;
- unsigned long trampoline_address = (unsigned long) &kretprobe_trampoline;
+ unsigned long trampoline_address = (unsigned long)&kretprobe_trampoline;
struct kretprobe *crp = NULL;
- struct kprobe_ctlblk *kcb = get_kprobe_ctlblk ();
-
- DBPRINTF ("start");
-
- if (p && p->tgid){
- // in case of user space retprobe trampoline is at the Nth instruction of US tramp
- if (!thumb_mode( regs ))
- trampoline_address = (unsigned long)(p->ainsn.insn + UPROBES_TRAMP_RET_BREAK_IDX);
- else
- trampoline_address = (unsigned long)(p->ainsn.insn) + 0x1b;
- }
+ struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
- spin_lock_irqsave (&kretprobe_lock, flags);
+ spin_lock_irqsave(&kretprobe_lock, flags);
/*
* We are using different hash keys (current and mm) for finding kernel
* task_struct. User space probes can be shared between threads of one
* process so they have different current but same mm.
*/
- if (p && p->tgid) {
- head = kretprobe_inst_table_head(current->mm);
- } else {
- head = kretprobe_inst_table_head(current);
- }
+ head = kretprobe_inst_table_head(current);
/*
* It is possible to have multiple instances associated with a given
* real return address, and all the rest will point to
* kretprobe_trampoline
*/
- hlist_for_each_entry_safe (ri, node, tmp, head, hlist)
- {
+ hlist_for_each_entry_safe(ri, node, tmp, head, hlist) {
if (ri->task != current)
/* another task is sharing our hash bucket */
continue;
- if (ri->rp && ri->rp->handler){
- ri->rp->handler (ri, regs, ri->rp->priv_arg);
+ if (ri->rp && ri->rp->handler) {
+ ri->rp->handler(ri, regs, ri->rp->priv_arg);
}
- orig_ret_address = (unsigned long) ri->ret_addr;
- recycle_rp_inst (ri);
+ orig_ret_address = (unsigned long)ri->ret_addr;
+ recycle_rp_inst(ri);
if (orig_ret_address != trampoline_address)
/*
* This is the real return address. Any other
*/
break;
}
- kretprobe_assert (ri, orig_ret_address, trampoline_address);
- //BUG_ON(!orig_ret_address || (orig_ret_address == trampoline_address));
- //E.G. Check this code in case of __switch_to function instrumentation -- currently this code generates dump in this case
- //if (trampoline_address != (unsigned long) &kretprobe_trampoline){
- //if (ri->rp2) BUG_ON (ri->rp2->kp.tgid == 0);
- //if (ri->rp) BUG_ON (ri->rp->kp.tgid == 0);
- //else if (ri->rp2) BUG_ON (ri->rp2->kp.tgid == 0);
- //}
- if ((ri->rp && ri->rp->kp.tgid) || (ri->rp2 && ri->rp2->kp.tgid))
- BUG_ON (trampoline_address == (unsigned long) &kretprobe_trampoline);
-
- regs->uregs[14] = orig_ret_address;
- DBPRINTF ("regs->uregs[14] = 0x%lx\n", regs->uregs[14]);
- DBPRINTF ("regs->uregs[15] = 0x%lx\n", regs->uregs[15]);
-
- if (trampoline_address != (unsigned long) &kretprobe_trampoline)
- {
- regs->uregs[15] = orig_ret_address;
- }else{
- if (!thumb_mode( regs )) regs->uregs[15] += 4;
- else regs->uregs[15] += 2;
- }
-
- DBPRINTF ("regs->uregs[15] = 0x%lx\n", regs->uregs[15]);
+ kretprobe_assert(ri, orig_ret_address, trampoline_address);
- if(p){ // ARM, MIPS, X86 user space
- if (thumb_mode( regs ) && !(regs->uregs[14] & 0x01))
- {
- regs->ARM_cpsr &= 0xFFFFFFDF;
- }else{
- if (user_mode( regs ) && (regs->uregs[14] & 0x01))
- {
- regs->ARM_cpsr |= 0x20;
- }
- }
+ regs->ARM_lr = orig_ret_address;
+ regs->ARM_pc = orig_ret_address;
- //TODO: test - enter function, delete us retprobe, exit function
- // for user space retprobes only - deferred deletion
-
- if (trampoline_address != (unsigned long) &kretprobe_trampoline)
- {
- // if we are not at the end of the list and current retprobe should be disarmed
- if (node && ri->rp2)
- {
- struct hlist_node *current_node = node;
- crp = ri->rp2;
- /*sprintf(die_msg, "deferred disarm p->addr = %p [%lx %lx %lx]\n",
- crp->kp.addr, *kaddrs[0], *kaddrs[1], *kaddrs[2]);
- DIE(die_msg, regs); */
- // look for other instances for the same retprobe
- hlist_for_each_entry_safe (ri, node, tmp, head, hlist)
- {
- /*
- * Trying to find another retprobe instance associated with
- * the same retprobe.
- */
- if (ri->rp2 == crp && node != current_node)
- break;
- }
-
- if (!node)
- {
- // if there are no more instances for this retprobe
- // delete retprobe
- struct kprobe *is_p = &crp->kp;
- DBPRINTF ("defered retprobe deletion p->addr = %p", crp->kp.addr);
- /*
- If there is no any retprobe instances of this retprobe
- we can free the resources related to the probe.
- */
- if (!(hlist_unhashed(&is_p->is_hlist_arm))) {
- hlist_del_rcu(&is_p->is_hlist_arm);
- }
- if (!(hlist_unhashed(&is_p->is_hlist_thumb))) {
- hlist_del_rcu(&is_p->is_hlist_thumb);
- }
- unregister_uprobe (&crp->kp, current, 1);
- kfree (crp);
- }
- hlist_del(current_node);
- }
- }
-
- if (kcb->kprobe_status == KPROBE_REENTER) {
- restore_previous_kprobe(kcb);
- } else {
- reset_current_kprobe();
- }
+ if (kcb->kprobe_status == KPROBE_REENTER) {
+ restore_previous_kprobe(kcb);
+ } else {
+ reset_current_kprobe();
}
- spin_unlock_irqrestore (&kretprobe_lock, flags);
+ spin_unlock_irqrestore(&kretprobe_lock, flags);
/*
* By returning a non-zero value, we are telling
return 1;
}
+EXPORT_SYMBOL_GPL(trampoline_probe_handler);
-void __arch_prepare_kretprobe (struct kretprobe *rp, struct pt_regs *regs)
+void arch_prepare_kretprobe(struct kretprobe *rp, struct pt_regs *regs)
{
struct kretprobe_instance *ri;
DBPRINTF ("start\n");
//TODO: test - remove retprobe after func entry but before its exit
- if ((ri = get_free_rp_inst (rp)) != NULL)
- {
+ if ((ri = get_free_rp_inst(rp)) != NULL) {
ri->rp = rp;
- ri->rp2 = NULL;
ri->task = current;
- ri->ret_addr = (kprobe_opcode_t *) regs->uregs[14];
+ ri->ret_addr = (kprobe_opcode_t *)regs->uregs[14];
+ ri->sp = (kprobe_opcode_t *)regs->ARM_sp; //uregs[13];
- if (rp->kp.tgid)
- if (!thumb_mode( regs ))
- regs->uregs[14] = (unsigned long) (rp->kp.ainsn.insn + UPROBES_TRAMP_RET_BREAK_IDX);
- else
- regs->uregs[14] = (unsigned long) (rp->kp.ainsn.insn) + 0x1b;
+ /* Set flag of current mode */
+ ri->sp = (kprobe_opcode_t *)((long)ri->sp | !!thumb_mode(regs));
- else /* Replace the return addr with trampoline addr */
- regs->uregs[14] = (unsigned long) &kretprobe_trampoline;
+ /* Replace the return addr with trampoline addr */
+ regs->uregs[14] = (unsigned long)&kretprobe_trampoline;
// DBPRINTF ("ret addr set to %p->%lx\n", ri->ret_addr, regs->uregs[14]);
- add_rp_inst (ri);
- }
- else {
+ add_rp_inst(ri);
+ } else {
DBPRINTF ("WARNING: missed retprobe %p\n", rp->kp.addr);
rp->nmissed++;
}
}
-
-int asm_init_module_dependencies()
+void swap_register_undef_hook(struct undef_hook *hook)
{
- //No module dependencies
- return 0;
+ __swap_register_undef_hook(hook);
}
+EXPORT_SYMBOL_GPL(swap_register_undef_hook);
-
-void (* do_kpro)(struct undef_hook *);
-void (* undo_kpro)(struct undef_hook *);
+void swap_unregister_undef_hook(struct undef_hook *hook)
+{
+ __swap_unregister_undef_hook(hook);
+}
+EXPORT_SYMBOL_GPL(swap_unregister_undef_hook);
// kernel probes hook
-struct undef_hook undef_ho_k = {
- .instr_mask = 0xffffffff,
- .instr_val = BREAKPOINT_INSTRUCTION,
- .cpsr_mask = MODE_MASK,
- .cpsr_val = SVC_MODE,
- .fn = kprobe_trap_handler
+static struct undef_hook undef_ho_k = {
+ .instr_mask = 0xffffffff,
+ .instr_val = BREAKPOINT_INSTRUCTION,
+ .cpsr_mask = MODE_MASK,
+ .cpsr_val = SVC_MODE,
+ .fn = kprobe_trap_handler
};
-// userspace probes hook (arm)
-struct undef_hook undef_ho_u = {
- .instr_mask = 0xffffffff,
- .instr_val = BREAKPOINT_INSTRUCTION,
- .cpsr_mask = MODE_MASK,
- .cpsr_val = USR_MODE,
- .fn = kprobe_trap_handler
-};
-
-// userspace probes hook (thumb)
-struct undef_hook undef_ho_u_t = {
- .instr_mask = 0xffffffff,
- .instr_val = BREAKPOINT_INSTRUCTION & 0x0000ffff,
- .cpsr_mask = MODE_MASK,
- .cpsr_val = USR_MODE,
- .fn = kprobe_trap_handler
-};
-
-int __init arch_init_kprobes (void)
+int arch_init_kprobes(void)
{
- unsigned int do_bp_handler = 0;
int ret = 0;
- if (arch_init_module_dependencies())
- {
- DBPRINTF ("Unable to init module dependencies\n");
- return -1;
- }
-
- do_bp_handler = (unsigned int) kallsyms_search ("do_undefinstr");
- if (do_bp_handler == 0) {
- DBPRINTF("no do_undefinstr symbol found!");
- return -1;
- }
- arr_traps_template[NOTIFIER_CALL_CHAIN_INDEX] = arch_construct_brunch ((unsigned int)kprobe_handler, do_bp_handler + NOTIFIER_CALL_CHAIN_INDEX * 4, 1);
// Register hooks (kprobe_handler)
- do_kpro = (void *)kallsyms_search ("register_undef_hook");
- if (do_kpro == 0) {
+ __swap_register_undef_hook = swap_ksyms("register_undef_hook");
+ if (__swap_register_undef_hook == NULL) {
printk("no register_undef_hook symbol found!\n");
return -1;
}
// Unregister hooks (kprobe_handler)
- undo_kpro = (void *)kallsyms_search ("unregister_undef_hook");
- if (undo_kpro == 0) {
+ __swap_unregister_undef_hook = swap_ksyms("unregister_undef_hook");
+ if (__swap_unregister_undef_hook == NULL) {
printk("no unregister_undef_hook symbol found!\n");
return -1;
}
- do_kpro(&undef_ho_k);
- do_kpro(&undef_ho_u);
- do_kpro(&undef_ho_u_t);
+ swap_register_undef_hook(&undef_ho_k);
if ((ret = dbi_register_kprobe (&trampoline_p)) != 0) {
//dbi_unregister_jprobe(&do_exit_p, 0);
return ret;
}
+
return ret;
}
-void __exit dbi_arch_exit_kprobes (void)
+void arch_exit_kprobes(void)
{
- undo_kpro(&undef_ho_u_t);
- undo_kpro(&undef_ho_u);
- undo_kpro(&undef_ho_k);
+ dbi_unregister_kprobe(&trampoline_p, NULL);
+ swap_unregister_undef_hook(&undef_ho_k);
}
-//EXPORT_SYMBOL_GPL (dbi_arch_uprobe_return);
-//EXPORT_SYMBOL_GPL (dbi_arch_exit_kprobes);
+/* export symbol for trampoline_arm.h */
+EXPORT_SYMBOL_GPL(gen_insn_execbuf);
+EXPORT_SYMBOL_GPL(pc_dep_insn_execbuf);
projects / kernel / swap-modules.git / blobdiff