#include <linux/mm.h>
#include "dbi_kprobes.h"
-#include "dbi_kprobes_arm.h"
-#include "dbi_kprobes_thumb.h"
+#include "trampoline_arm.h"
#include "../dbi_kprobes.h"
#include "../../dbi_kprobes.h"
#include <ksyms.h>
#include <asm/cacheflush.h>
-
-#ifdef TRAP_OVERHEAD_DEBUG
-#include <linux/pid.h>
-#include <linux/signal.h>
-#endif
-
-#ifdef OVERHEAD_DEBUG
-#include <linux/time.h>
-#endif
-
#include <asm/traps.h>
#include <asm/ptrace.h>
#include <linux/list.h>
static void (*__swap_register_undef_hook)(struct undef_hook *hook);
static void (*__swap_unregister_undef_hook)(struct undef_hook *hook);
-#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
-
-static 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
-};
-
-
static struct kprobe trampoline_p =
{
- .addr = (kprobe_opcode_t *) & kretprobe_trampoline,
+ .addr = (kprobe_opcode_t *)&kretprobe_trampoline,
.pre_handler = trampoline_probe_handler
};
{
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);
+ ARM_INSN_REG_SET_RD(insns[3], i);
+
return 0;
}
EXPORT_SYMBOL_GPL(prep_pc_dep_insn_execbuf);
// 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;
}
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, &kprobe_insn_pages, 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));
+ 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;
+
+ 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(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();
+ 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 ();
+ }
+ } 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);
}
- insn = insn & 0xffffff;
- insn = insn | ((link != 0) ? 0xeb000000 : 0xea000000);
- DBPRINTF ("insn=%lX\n", insn);
- return (unsigned int) insn;
-}
-int arch_prepare_uretprobe (struct kretprobe *p, struct task_struct *task)
-{
- DBPRINTF("Warrning: arch_prepare_uretprobe is not implemented\n");
- return 0;
+ return ret;
}
-EXPORT_SYMBOL_GPL(arch_prepare_uretprobe);
-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;
DBPRINTF ("set_current_kprobe: p=%p addr=%p\n", p, p->addr);
}
-#ifdef TRAP_OVERHEAD_DEBUG
-static unsigned long trap_handler_counter_debug = 0;
-#define SAMPLING_COUNTER 100000
-#endif
-
static int kprobe_handler(struct pt_regs *regs)
{
struct kprobe *p, *cur;
kcb = get_kprobe_ctlblk();
cur = kprobe_running();
- p = get_kprobe((kprobe_opcode_t *)regs->ARM_pc, 0);
+ p = get_kprobe((void *)regs->ARM_pc);
if (p) {
if (cur) {
entry_point_t entry = (entry_point_t)jp->entry;
pre_entry = (kprobe_pre_entry_handler_t)jp->pre_entry;
- if (p->tgid) {
- panic("setjmp_pre_handler: p->tgid == 0");
- }
-
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);
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]);
-
- 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;
- }
- }
-
- //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;
- }
+ kretprobe_assert(ri, orig_ret_address, trampoline_address);
- 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);
- }
-
- dbi_unregister_kprobe(&crp->kp, current);
- kfree (crp);
- }
- hlist_del(current_node);
- }
- }
+ regs->ARM_lr = orig_ret_address;
+ regs->ARM_pc = orig_ret_address;
- 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
}
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];
/* Set flag of current mode */
ri->sp = (kprobe_opcode_t *)((long)ri->sp | !!thumb_mode(regs));
- if (rp->kp.tgid) {
- panic("__arch_prepare_kretprobe: rp->kp.tgid != 0");
- }
-
/* Replace the return addr with trampoline addr */
- regs->uregs[14] = (unsigned long) &kretprobe_trampoline;
+ 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)
-{
- //No module dependencies
- return 0;
-}
-
void swap_register_undef_hook(struct undef_hook *hook)
{
__swap_register_undef_hook(hook);
// kernel probes hook
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
+ .instr_mask = 0xffffffff,
+ .instr_val = BREAKPOINT_INSTRUCTION,
+ .cpsr_mask = MODE_MASK,
+ .cpsr_val = SVC_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 = swap_ksyms("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)
__swap_register_undef_hook = swap_ksyms("register_undef_hook");
if (__swap_register_undef_hook == NULL) {
//dbi_unregister_jprobe(&do_exit_p, 0);
return ret;
}
+
return ret;
}
-void __exit dbi_arch_exit_kprobes (void)
+void arch_exit_kprobes(void)
{
+ dbi_unregister_kprobe(&trampoline_p, NULL);
swap_unregister_undef_hook(&undef_ho_k);
}
-//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