--- /dev/null
+/* Target-dependent code for the Tilera TILE-Gx processor.
+
+ Copyright (C) 2012 Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#include "defs.h"
+#include "frame.h"
+#include "frame-base.h"
+#include "frame-unwind.h"
+#include "dwarf2-frame.h"
+#include "trad-frame.h"
+#include "symtab.h"
+#include "gdbtypes.h"
+#include "gdbcmd.h"
+#include "gdbcore.h"
+#include "value.h"
+#include "dis-asm.h"
+#include "inferior.h"
+#include "gdb_string.h"
+#include "gdb_assert.h"
+#include "arch-utils.h"
+#include "floatformat.h"
+#include "regcache.h"
+#include "regset.h"
+#include "doublest.h"
+#include "osabi.h"
+#include "linux-tdep.h"
+#include "objfiles.h"
+#include "solib-svr4.h"
+#include "symtab.h"
+#include "tilegx-tdep.h"
+#include "opcode/tilegx.h"
+
+struct tilegx_frame_cache
+{
+ /* Base address. */
+ CORE_ADDR base;
+ /* Function start. */
+ CORE_ADDR start_pc;
+
+ /* Table of saved registers. */
+ struct trad_frame_saved_reg *saved_regs;
+};
+
+/* Register state values used by analyze_prologue. */
+enum reverse_state
+ {
+ REVERSE_STATE_REGISTER,
+ REVERSE_STATE_VALUE,
+ REVERSE_STATE_UNKNOWN
+ };
+
+/* Register state used by analyze_prologue(). */
+struct tilegx_reverse_regs
+{
+ LONGEST value;
+ enum reverse_state state;
+};
+
+static const struct tilegx_reverse_regs
+template_reverse_regs[TILEGX_NUM_PHYS_REGS] =
+ {
+ { TILEGX_R0_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R1_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R2_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R3_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R4_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R5_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R6_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R7_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R8_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R9_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R10_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R11_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R12_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R13_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R14_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R15_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R16_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R17_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R18_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R19_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R20_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R21_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R22_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R23_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R24_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R25_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R26_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R27_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R28_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R29_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R30_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R31_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R32_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R33_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R34_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R35_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R36_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R37_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R38_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R39_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R40_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R41_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R42_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R43_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R44_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R45_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R46_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R47_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R48_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R49_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R50_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R51_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_R52_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_TP_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_SP_REGNUM, REVERSE_STATE_REGISTER },
+ { TILEGX_LR_REGNUM, REVERSE_STATE_REGISTER },
+ { 0, REVERSE_STATE_UNKNOWN },
+ { 0, REVERSE_STATE_UNKNOWN },
+ { 0, REVERSE_STATE_UNKNOWN },
+ { 0, REVERSE_STATE_UNKNOWN },
+ { 0, REVERSE_STATE_UNKNOWN },
+ { 0, REVERSE_STATE_UNKNOWN },
+ { 0, REVERSE_STATE_UNKNOWN },
+ { TILEGX_ZERO_REGNUM, REVERSE_STATE_VALUE }
+ };
+
+/* Implement the "register_name" gdbarch method. */
+
+static const char *
+tilegx_register_name (struct gdbarch *gdbarch, int regnum)
+{
+ static const char *const register_names[TILEGX_NUM_REGS] =
+ {
+ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+ "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
+ "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
+ "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
+ "r32", "r33", "r34", "r35", "r36", "r37", "r38", "r39",
+ "r40", "r41", "r42", "r43", "r44", "r45", "r46", "r47",
+ "r48", "r49", "r50", "r51", "r52", "tp", "sp", "lr",
+ "sn", "idn0", "idn1", "udn0", "udn1", "udn2", "udn3", "zero",
+ "pc"
+ };
+
+ if (regnum < 0 || regnum >= TILEGX_NUM_REGS)
+ internal_error (__FILE__, __LINE__,
+ "tilegx_register_name: invalid register number %d",
+ regnum);
+
+ return register_names[regnum];
+}
+
+/* This is the implementation of gdbarch method register_type. */
+
+static struct type *
+tilegx_register_type (struct gdbarch *gdbarch, int regnum)
+{
+ if (regnum == TILEGX_PC_REGNUM)
+ return builtin_type (gdbarch)->builtin_func_ptr;
+ else
+ return builtin_type (gdbarch)->builtin_uint64;
+}
+
+/* This is the implementation of gdbarch method dwarf2_reg_to_regnum. */
+
+static int
+tilegx_dwarf2_reg_to_regnum (struct gdbarch *gdbarch, int num)
+{
+ return num;
+}
+
+/* Makes the decision of whether a given type is a scalar type.
+ Scalar types are returned in the registers r2-r11 as they fit. */
+
+static int
+tilegx_type_is_scalar (struct type *t)
+{
+ return (TYPE_CODE(t) != TYPE_CODE_STRUCT
+ && TYPE_CODE(t) != TYPE_CODE_UNION
+ && TYPE_CODE(t) != TYPE_CODE_ARRAY);
+}
+
+/* Returns non-zero if the given struct type will be returned using
+ a special convention, rather than the normal function return method.
+ Used in the context of the "return" command, and target function
+ calls from the debugger. */
+
+static int
+tilegx_use_struct_convention (struct type *type)
+{
+ /* Only scalars which fit in R0 - R9 can be returned in registers.
+ Otherwise, they are returned via a pointer passed in R0. */
+ return (!tilegx_type_is_scalar (type)
+ && (TYPE_LENGTH (type) > (1 + TILEGX_R9_REGNUM - TILEGX_R0_REGNUM)
+ * tilegx_reg_size));
+}
+
+/* Find a function's return value in the appropriate registers (in
+ REGCACHE), and copy it into VALBUF. */
+
+static void
+tilegx_extract_return_value (struct type *type, struct regcache *regcache,
+ gdb_byte *valbuf)
+{
+ int len = TYPE_LENGTH (type);
+ int i, regnum = TILEGX_R0_REGNUM;
+
+ for (i = 0; i < len; i += tilegx_reg_size)
+ regcache_raw_read (regcache, regnum++, valbuf + i);
+}
+
+/* Copy the function return value from VALBUF into the proper
+ location for a function return.
+ Called only in the context of the "return" command. */
+
+static void
+tilegx_store_return_value (struct type *type, struct regcache *regcache,
+ const void *valbuf)
+{
+ if (TYPE_LENGTH (type) < tilegx_reg_size)
+ {
+ /* Add leading zeros to the (little-endian) value. */
+ gdb_byte buf[tilegx_reg_size] = { 0 };
+
+ memcpy (buf, valbuf, TYPE_LENGTH (type));
+ regcache_raw_write (regcache, TILEGX_R0_REGNUM, buf);
+ }
+ else
+ {
+ int len = TYPE_LENGTH (type);
+ int i, regnum = TILEGX_R0_REGNUM;
+
+ for (i = 0; i < len; i += tilegx_reg_size)
+ regcache_raw_write (regcache, regnum++, (gdb_byte *) valbuf + i);
+ }
+}
+
+/* This is the implementation of gdbarch method return_value. */
+
+static enum return_value_convention
+tilegx_return_value (struct gdbarch *gdbarch, struct value *function,
+ struct type *type, struct regcache *regcache,
+ gdb_byte *readbuf, const gdb_byte *writebuf)
+{
+ if (tilegx_use_struct_convention (type))
+ return RETURN_VALUE_STRUCT_CONVENTION;
+ if (writebuf)
+ tilegx_store_return_value (type, regcache, writebuf);
+ else if (readbuf)
+ tilegx_extract_return_value (type, regcache, readbuf);
+ return RETURN_VALUE_REGISTER_CONVENTION;
+}
+
+/* This is the implementation of gdbarch method frame_align. */
+
+static CORE_ADDR
+tilegx_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr)
+{
+ return addr & -8;
+}
+
+
+/* Implement the "push_dummy_call" gdbarch method. */
+
+static CORE_ADDR
+tilegx_push_dummy_call (struct gdbarch *gdbarch,
+ struct value *function,
+ struct regcache *regcache,
+ CORE_ADDR bp_addr, int nargs,
+ struct value **args,
+ CORE_ADDR sp, int struct_return,
+ CORE_ADDR struct_addr)
+{
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ CORE_ADDR stack_dest = sp;
+ int argreg = TILEGX_R0_REGNUM;
+ int i, j;
+ int typelen, slacklen, alignlen;
+ static const gdb_byte two_zero_words[8] = { 0 };
+
+ /* If struct_return is 1, then the struct return address will
+ consume one argument-passing register. */
+ if (struct_return)
+ regcache_cooked_write_unsigned (regcache, argreg++, struct_addr);
+
+ /* Arguments are passed in R0 - R9, and as soon as an argument
+ will not fit completely in the remaining registers, then it,
+ and all remaining arguments, are put on the stack. */
+ for (i = 0; i < nargs && argreg <= TILEGX_R9_REGNUM; i++)
+ {
+ const gdb_byte *val;
+ typelen = TYPE_LENGTH (value_enclosing_type (args[i]));
+
+ if (typelen > (TILEGX_R9_REGNUM - argreg + 1) * tilegx_reg_size)
+ break;
+
+ /* Put argument into registers wordwise. */
+ val = value_contents (args[i]);
+ for (j = 0; j < typelen; j += tilegx_reg_size)
+ {
+ /* ISSUE: Why special handling for "typelen = 4x + 1"?
+ I don't ever see "typelen" values except 4 and 8. */
+ int n = (typelen - j == 1) ? 1 : tilegx_reg_size;
+ ULONGEST w = extract_unsigned_integer (val + j, n, byte_order);
+
+ regcache_cooked_write_unsigned (regcache, argreg++, w);
+ }
+ }
+
+ /* Align SP. */
+ stack_dest = tilegx_frame_align (gdbarch, stack_dest);
+
+ /* Loop backwards through arguments to determine stack alignment. */
+ alignlen = 0;
+
+ for (j = nargs - 1; j >= i; j--)
+ {
+ typelen = TYPE_LENGTH (value_enclosing_type (args[j]));
+ alignlen += (typelen + 3) & (~3);
+ }
+
+ if (alignlen & 0x4)
+ stack_dest -= 4;
+
+ /* Loop backwards through remaining arguments and push them on
+ the stack, word aligned. */
+ for (j = nargs - 1; j >= i; j--)
+ {
+ gdb_byte *val;
+
+ typelen = TYPE_LENGTH (value_enclosing_type (args[j]));
+ slacklen = ((typelen + 3) & (~3)) - typelen;
+ val = alloca (typelen + slacklen);
+ memcpy (val, value_contents (args[j]), typelen);
+ memset (val + typelen, 0, slacklen);
+
+ /* Now write data to the stack. The stack grows downwards. */
+ stack_dest -= typelen + slacklen;
+ write_memory (stack_dest, val, typelen + slacklen);
+ }
+
+ /* Add 2 words for linkage space to the stack. */
+ stack_dest = stack_dest - 8;
+ write_memory (stack_dest, two_zero_words, 8);
+
+ /* Update stack pointer. */
+ regcache_cooked_write_unsigned (regcache, TILEGX_SP_REGNUM, stack_dest);
+
+ /* Set the return address register to point to the entry point of
+ the program, where a breakpoint lies in wait. */
+ regcache_cooked_write_unsigned (regcache, TILEGX_LR_REGNUM, bp_addr);
+
+ return stack_dest;
+}
+
+
+/* Decode the instructions within the given address range.
+ Decide when we must have reached the end of the function prologue.
+ If a frame_info pointer is provided, fill in its saved_regs etc.
+ Returns the address of the first instruction after the prologue.
+ NOTE: This is often called with start_addr being the start of some
+ function, and end_addr being the current PC. */
+
+static CORE_ADDR
+tilegx_analyze_prologue (struct gdbarch* gdbarch,
+ CORE_ADDR start_addr, CORE_ADDR end_addr,
+ struct tilegx_frame_cache *cache,
+ struct frame_info *next_frame)
+{
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ CORE_ADDR next_addr;
+ CORE_ADDR prolog_end = end_addr;
+ ULONGEST inst, inst2;
+ LONGEST offset;
+ int regnum;
+ gdb_byte instbuf[32 * TILEGX_BUNDLE_SIZE_IN_BYTES];
+ CORE_ADDR instbuf_start;
+ unsigned int instbuf_size;
+ int status;
+ bfd_uint64_t bundle;
+ struct tilegx_decoded_instruction
+ decoded[TILEGX_MAX_INSTRUCTIONS_PER_BUNDLE];
+ int num_insns;
+ struct tilegx_reverse_regs reverse_frame[TILEGX_NUM_PHYS_REGS];
+ struct tilegx_reverse_regs
+ new_reverse_frame[TILEGX_MAX_INSTRUCTIONS_PER_BUNDLE];
+ int dest_regs[TILEGX_MAX_INSTRUCTIONS_PER_BUNDLE];
+ int reverse_frame_valid, prolog_done, branch_seen;
+ LONGEST prev_sp_value;
+ int i, j;
+
+ if (start_addr >= end_addr
+ || (start_addr % TILEGX_BUNDLE_ALIGNMENT_IN_BYTES) != 0)
+ return end_addr;
+
+ /* Initialize the reverse frame. This maps the CURRENT frame's
+ registers to the outer frame's registers (the frame on the
+ stack goes the other way). */
+ memcpy (&reverse_frame, &template_reverse_regs, sizeof (reverse_frame));
+
+ prolog_done = 0;
+ branch_seen = 0;
+ prev_sp_value = 0;
+
+ /* To cut down on round-trip overhead, we fetch multiple bundles
+ at once. These variables describe the range of memory we have
+ prefetched. */
+ instbuf_start = 0;
+ instbuf_size = 0;
+
+ for (next_addr = start_addr;
+ next_addr < end_addr;
+ next_addr += TILEGX_BUNDLE_SIZE_IN_BYTES)
+ {
+ /* Retrieve the next instruction. */
+ if (next_addr - instbuf_start >= instbuf_size)
+ {
+ /* Figure out how many bytes to fetch. Don't span a page
+ boundary since that might cause an unnecessary memory
+ error. */
+ unsigned int size_on_same_page = 4096 - (next_addr & 4095);
+
+ instbuf_size = sizeof instbuf;
+
+ if (instbuf_size > size_on_same_page)
+ instbuf_size = size_on_same_page;
+ instbuf_start = next_addr;
+
+ status = safe_frame_unwind_memory (next_frame, instbuf_start,
+ instbuf, instbuf_size);
+ if (status == 0)
+ memory_error (status, next_addr);
+ }
+
+ reverse_frame_valid = 0;
+
+ bundle = extract_unsigned_integer (&instbuf[next_addr - instbuf_start],
+ 8, byte_order);
+
+ num_insns = parse_insn_tilegx (bundle, next_addr, decoded);
+
+ for (i = 0; i < num_insns; i++)
+ {
+ struct tilegx_decoded_instruction *this_insn = &decoded[i];
+ int64_t *operands = (int64_t *) this_insn->operand_values;
+ const struct tilegx_opcode *opcode = this_insn->opcode;
+
+ switch (opcode->mnemonic)
+ {
+ case TILEGX_OPC_ST:
+ if (cache
+ && reverse_frame[operands[0]].state == REVERSE_STATE_VALUE
+ && reverse_frame[operands[1]].state
+ == REVERSE_STATE_REGISTER)
+ {
+ LONGEST saved_address = reverse_frame[operands[0]].value;
+ unsigned saved_register
+ = (unsigned) reverse_frame[operands[1]].value;
+
+ /* realreg >= 0 and addr != -1 indicates that the
+ value of saved_register is in memory location
+ saved_address. The value of realreg is not
+ meaningful in this case but it must be >= 0.
+ See trad-frame.h. */
+ cache->saved_regs[saved_register].realreg = saved_register;
+ cache->saved_regs[saved_register].addr = saved_address;
+ }
+ break;
+ case TILEGX_OPC_ADDI:
+ case TILEGX_OPC_ADDLI:
+ if (cache
+ && operands[0] == TILEGX_SP_REGNUM
+ && operands[1] == TILEGX_SP_REGNUM
+ && reverse_frame[operands[1]].state == REVERSE_STATE_REGISTER)
+ {
+ /* Special case. We're fixing up the stack frame. */
+ uint64_t hopefully_sp
+ = (unsigned) reverse_frame[operands[1]].value;
+ short op2_as_short = (short) operands[2];
+ signed char op2_as_char = (signed char) operands[2];
+
+ /* Fix up the sign-extension. */
+ if (opcode->mnemonic == TILEGX_OPC_ADDI)
+ op2_as_short = op2_as_char;
+ prev_sp_value = (cache->saved_regs[hopefully_sp].addr
+ - op2_as_short);
+
+ new_reverse_frame[i].state = REVERSE_STATE_VALUE;
+ new_reverse_frame[i].value
+ = cache->saved_regs[hopefully_sp].addr;
+ trad_frame_set_value (cache->saved_regs,
+ hopefully_sp, prev_sp_value);
+ }
+ else
+ {
+ short op2_as_short = (short) operands[2];
+ signed char op2_as_char = (signed char) operands[2];
+
+ /* Fix up the sign-extension. */
+ if (opcode->mnemonic == TILEGX_OPC_ADDI)
+ op2_as_short = op2_as_char;
+
+ new_reverse_frame[i] = reverse_frame[operands[1]];
+ if (new_reverse_frame[i].state == REVERSE_STATE_VALUE)
+ new_reverse_frame[i].value += op2_as_short;
+ else
+ new_reverse_frame[i].state = REVERSE_STATE_UNKNOWN;
+ }
+ reverse_frame_valid |= 1 << i;
+ dest_regs[i] = operands[0];
+ break;
+ case TILEGX_OPC_ADD:
+ if (reverse_frame[operands[1]].state == REVERSE_STATE_VALUE
+ && reverse_frame[operands[2]].state == REVERSE_STATE_VALUE)
+ {
+ /* We have values -- we can do this. */
+ new_reverse_frame[i] = reverse_frame[operands[2]];
+ new_reverse_frame[i].value
+ += reverse_frame[operands[i]].value;
+ }
+ else
+ {
+ /* We don't know anything about the values. Punt. */
+ new_reverse_frame[i].state = REVERSE_STATE_UNKNOWN;
+ }
+ reverse_frame_valid |= 1 << i;
+ dest_regs[i] = operands[0];
+ break;
+ case TILEGX_OPC_MOVE:
+ new_reverse_frame[i] = reverse_frame[operands[1]];
+ reverse_frame_valid |= 1 << i;
+ dest_regs[i] = operands[0];
+ break;
+ case TILEGX_OPC_MOVEI:
+ case TILEGX_OPC_MOVELI:
+ new_reverse_frame[i].state = REVERSE_STATE_VALUE;
+ new_reverse_frame[i].value = operands[1];
+ reverse_frame_valid |= 1 << i;
+ dest_regs[i] = operands[0];
+ break;
+ case TILEGX_OPC_ORI:
+ if (reverse_frame[operands[1]].state == REVERSE_STATE_VALUE)
+ {
+ /* We have a value in A -- we can do this. */
+ new_reverse_frame[i] = reverse_frame[operands[1]];
+ new_reverse_frame[i].value
+ = reverse_frame[operands[1]].value | operands[2];
+ }
+ else if (operands[2] == 0)
+ {
+ /* This is a move. */
+ new_reverse_frame[i] = reverse_frame[operands[1]];
+ }
+ else
+ {
+ /* We don't know anything about the values. Punt. */
+ new_reverse_frame[i].state = REVERSE_STATE_UNKNOWN;
+ }
+ reverse_frame_valid |= 1 << i;
+ dest_regs[i] = operands[0];
+ break;
+ case TILEGX_OPC_OR:
+ if (reverse_frame[operands[1]].state == REVERSE_STATE_VALUE
+ && reverse_frame[operands[1]].value == 0)
+ {
+ /* This is a move. */
+ new_reverse_frame[i] = reverse_frame[operands[2]];
+ }
+ else if (reverse_frame[operands[2]].state == REVERSE_STATE_VALUE
+ && reverse_frame[operands[2]].value == 0)
+ {
+ /* This is a move. */
+ new_reverse_frame[i] = reverse_frame[operands[1]];
+ }
+ else
+ {
+ /* We don't know anything about the values. Punt. */
+ new_reverse_frame[i].state = REVERSE_STATE_UNKNOWN;
+ }
+ reverse_frame_valid |= 1 << i;
+ dest_regs[i] = operands[0];
+ break;
+ case TILEGX_OPC_SUB:
+ if (reverse_frame[operands[1]].state == REVERSE_STATE_VALUE
+ && reverse_frame[operands[2]].state == REVERSE_STATE_VALUE)
+ {
+ /* We have values -- we can do this. */
+ new_reverse_frame[i] = reverse_frame[operands[1]];
+ new_reverse_frame[i].value
+ -= reverse_frame[operands[2]].value;
+ }
+ else
+ {
+ /* We don't know anything about the values. Punt. */
+ new_reverse_frame[i].state = REVERSE_STATE_UNKNOWN;
+ }
+ reverse_frame_valid |= 1 << i;
+ dest_regs[i] = operands[0];
+ break;
+
+ case TILEGX_OPC_FNOP:
+ case TILEGX_OPC_INFO:
+ case TILEGX_OPC_INFOL:
+ /* Nothing to see here, move on.
+ Note that real NOP is treated as a 'real' instruction
+ because someone must have intended that it be there.
+ It therefore terminates the prolog. */
+ break;
+
+ case TILEGX_OPC_J:
+ case TILEGX_OPC_JAL:
+
+ case TILEGX_OPC_BEQZ:
+ case TILEGX_OPC_BEQZT:
+ case TILEGX_OPC_BGEZ:
+ case TILEGX_OPC_BGEZT:
+ case TILEGX_OPC_BGTZ:
+ case TILEGX_OPC_BGTZT:
+ case TILEGX_OPC_BLBC:
+ case TILEGX_OPC_BLBCT:
+ case TILEGX_OPC_BLBS:
+ case TILEGX_OPC_BLBST:
+ case TILEGX_OPC_BLEZ:
+ case TILEGX_OPC_BLEZT:
+ case TILEGX_OPC_BLTZ:
+ case TILEGX_OPC_BLTZT:
+ case TILEGX_OPC_BNEZ:
+ case TILEGX_OPC_BNEZT:
+
+ case TILEGX_OPC_IRET:
+ case TILEGX_OPC_JALR:
+ case TILEGX_OPC_JALRP:
+ case TILEGX_OPC_JR:
+ case TILEGX_OPC_JRP:
+ case TILEGX_OPC_SWINT0:
+ case TILEGX_OPC_SWINT1:
+ case TILEGX_OPC_SWINT2:
+ case TILEGX_OPC_SWINT3:
+ /* We're really done -- this is a branch. */
+ branch_seen = 1;
+ prolog_done = 1;
+ break;
+ default:
+ /* We don't know or care what this instruction is.
+ All we know is that it isn't part of a prolog, and if
+ there's a destination register, we're trashing it. */
+ prolog_done = 1;
+ for (j = 0; j < opcode->num_operands; j++)
+ {
+ if (this_insn->operands[j]->is_dest_reg)
+ {
+ dest_regs[i] = operands[j];
+ new_reverse_frame[i].state = REVERSE_STATE_UNKNOWN;
+ reverse_frame_valid |= 1 << i;
+ break;
+ }
+ }
+ break;
+ }
+ }
+
+ /* Now update the reverse frames. */
+ for (i = 0; i < num_insns; i++)
+ {
+ /* ISSUE: Does this properly handle "network" registers? */
+ if ((reverse_frame_valid & (1 << i))
+ && dest_regs[i] != TILEGX_ZERO_REGNUM)
+ reverse_frame[dest_regs[i]] = new_reverse_frame[i];
+ }
+
+ if (prev_sp_value != 0)
+ {
+ /* GCC uses R52 as a frame pointer. Have we seen "move r52, sp"? */
+ if (reverse_frame[TILEGX_R52_REGNUM].state == REVERSE_STATE_REGISTER
+ && reverse_frame[TILEGX_R52_REGNUM].value == TILEGX_SP_REGNUM)
+ {
+ reverse_frame[TILEGX_R52_REGNUM].state = REVERSE_STATE_VALUE;
+ reverse_frame[TILEGX_R52_REGNUM].value = prev_sp_value;
+ }
+
+ prev_sp_value = 0;
+ }
+
+ if (prolog_done && prolog_end == end_addr)
+ {
+ /* We found non-prolog code. As such, _this_ instruction
+ is the one after the prolog. We keep processing, because
+ there may be more prolog code in there, but this is what
+ we'll return. */
+ /* ISSUE: There may not have actually been a prologue, and
+ we may have simply skipped some random instructions. */
+ prolog_end = next_addr;
+ }
+ if (branch_seen)
+ {
+ /* We saw a branch. The prolog absolutely must be over. */
+ break;
+ }
+ }
+
+ if (prolog_end == end_addr && cache)
+ {
+ /* We may have terminated the prolog early, and we're certainly
+ at THIS point right now. It's possible that the values of
+ registers we need are currently actually in other registers
+ (and haven't been written to memory yet). Go find them. */
+ for (i = 0; i < TILEGX_NUM_PHYS_REGS; i++)
+ {
+ if (reverse_frame[i].state == REVERSE_STATE_REGISTER
+ && reverse_frame[i].value != i)
+ {
+ unsigned saved_register = (unsigned) reverse_frame[i].value;
+
+ cache->saved_regs[saved_register].realreg = i;
+ cache->saved_regs[saved_register].addr = (LONGEST) -1;
+ }
+ }
+ }
+
+ return prolog_end;
+}
+
+/* This is the implementation of gdbarch method skip_prologue. */
+
+static CORE_ADDR
+tilegx_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+ struct symtab_and_line sal;
+ CORE_ADDR func_start, func_end;
+
+ /* This is the preferred method, find the end of the prologue by
+ using the debugging information. */
+ if (find_pc_partial_function (pc, NULL, &func_start, &func_end))
+ {
+ sal = find_pc_line (func_start, 0);
+
+ if (sal.end < func_end && pc <= sal.end)
+ return sal.end;
+ }
+
+ /* Otherwise, try to skip prologue the hard way. */
+ return tilegx_analyze_prologue (gdbarch,
+ pc, pc + 8 * TILEGX_BUNDLE_SIZE_IN_BYTES,
+ NULL, NULL);
+}
+
+/* This is the implementation of gdbarch method in_function_epilogue_p. */
+
+static int
+tilegx_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+ CORE_ADDR func_addr = 0, func_end = 0;
+
+ if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
+ {
+ ULONGEST inst, inst2;
+ CORE_ADDR addr = func_end - TILEGX_BUNDLE_SIZE_IN_BYTES;
+
+ /* FIXME: Find the actual epilogue. */
+ /* HACK: Just assume the final bundle is the "ret" instruction". */
+ if (pc > addr)
+ return 1;
+ }
+ return 0;
+}
+
+/* This is the implementation of gdbarch method breakpoint_from_pc. */
+
+static const unsigned char *
+tilegx_breakpoint_from_pc (struct gdbarch *gdbarch,
+ CORE_ADDR *pcptr, int *lenptr)
+{
+ /* 64-bit pattern for a { bpt ; nop } bundle. */
+ static const unsigned char breakpoint[] =
+ { 0x00, 0x50, 0x48, 0x51, 0xae, 0x44, 0x6a, 0x28 };
+
+ *lenptr = sizeof (breakpoint);
+ return breakpoint;
+}
+
+/* Normal frames. */
+
+static struct tilegx_frame_cache *
+tilegx_frame_cache (struct frame_info *this_frame, void **this_cache)
+{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ struct tilegx_frame_cache *cache;
+ CORE_ADDR current_pc;
+ int i;
+
+ if (*this_cache)
+ return *this_cache;
+
+ cache = FRAME_OBSTACK_ZALLOC (struct tilegx_frame_cache);
+ *this_cache = cache;
+ cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
+ cache->base = 0;
+ cache->start_pc = get_frame_func (this_frame);
+ current_pc = get_frame_pc (this_frame);
+
+ cache->base = get_frame_register_unsigned (this_frame, TILEGX_SP_REGNUM);
+ trad_frame_set_value (cache->saved_regs, TILEGX_SP_REGNUM, cache->base);
+
+ cache->saved_regs[TILEGX_PC_REGNUM] = cache->saved_regs[TILEGX_LR_REGNUM];
+ if (cache->start_pc)
+ tilegx_analyze_prologue (gdbarch, cache->start_pc, current_pc,
+ cache, this_frame);
+
+ return cache;
+}
+
+/* Retrieve the value of REGNUM in FRAME. */
+
+static struct value*
+tilegx_frame_prev_register (struct frame_info *this_frame,
+ void **this_cache,
+ int regnum)
+{
+ struct tilegx_frame_cache *info =
+ tilegx_frame_cache (this_frame, this_cache);
+
+ return trad_frame_get_prev_register (this_frame, info->saved_regs,
+ regnum);
+}
+
+/* Build frame id. */
+
+static void
+tilegx_frame_this_id (struct frame_info *this_frame, void **this_cache,
+ struct frame_id *this_id)
+{
+ struct tilegx_frame_cache *info =
+ tilegx_frame_cache (this_frame, this_cache);
+
+ /* This marks the outermost frame. */
+ if (info->base == 0)
+ return;
+
+ (*this_id) = frame_id_build (info->base, info->start_pc);
+}
+
+static CORE_ADDR
+tilegx_frame_base_address (struct frame_info *this_frame, void **this_cache)
+{
+ struct tilegx_frame_cache *cache =
+ tilegx_frame_cache (this_frame, this_cache);
+
+ return cache->base;
+}
+
+static const struct frame_unwind tilegx_frame_unwind = {
+ NORMAL_FRAME,
+ default_frame_unwind_stop_reason,
+ tilegx_frame_this_id,
+ tilegx_frame_prev_register,
+ NULL, /* const struct frame_data *unwind_data */
+ default_frame_sniffer, /* frame_sniffer_ftype *sniffer */
+ NULL /* frame_prev_pc_ftype *prev_pc */
+};
+
+static const struct frame_base tilegx_frame_base = {
+ &tilegx_frame_unwind,
+ tilegx_frame_base_address,
+ tilegx_frame_base_address,
+ tilegx_frame_base_address
+};
+
+static CORE_ADDR
+tilegx_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+ return frame_unwind_register_unsigned (next_frame, TILEGX_SP_REGNUM);
+}
+
+static CORE_ADDR
+tilegx_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+ return frame_unwind_register_unsigned (next_frame, TILEGX_PC_REGNUM);
+}
+
+static struct frame_id
+tilegx_unwind_dummy_id (struct gdbarch *gdbarch,
+ struct frame_info *this_frame)
+{
+ CORE_ADDR sp;
+
+ sp = get_frame_register_unsigned (this_frame, TILEGX_SP_REGNUM);
+ return frame_id_build (sp, get_frame_pc (this_frame));
+}
+
+
+/* We cannot read/write the "special" registers. */
+
+static int
+tilegx_cannot_reference_register (struct gdbarch *gdbarch, int regno)
+{
+ if (regno >= 0 && regno < TILEGX_NUM_EASY_REGS)
+ return 0;
+ else if (regno == TILEGX_PC_REGNUM)
+ return 0;
+ else
+ return 1;
+}
+
+static struct gdbarch *
+tilegx_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
+{
+ struct gdbarch *gdbarch;
+ int arch_size = 64;
+
+ /* Handle arch_size == 32 or 64. Default to 64. */
+ if (info.abfd)
+ arch_size = bfd_get_arch_size (info.abfd);
+
+ /* Try to find a pre-existing architecture. */
+ for (arches = gdbarch_list_lookup_by_info (arches, &info);
+ arches != NULL;
+ arches = gdbarch_list_lookup_by_info (arches->next, &info))
+ {
+ /* We only have two flavors -- just make sure arch_size matches. */
+ if (gdbarch_ptr_bit (arches->gdbarch) == arch_size)
+ return (arches->gdbarch);
+ }
+
+ gdbarch = gdbarch_alloc (&info, NULL);
+
+ /* Basic register fields and methods, datatype sizes and stuff. */
+
+ /* There are 64 physical registers which can be referenced by
+ instructions (although only 56 of them can actually be
+ debugged) and 1 magic register (the PC). The other three
+ magic registers (ex1, syscall, orig_r0) which are known to
+ "ptrace" are ignored by "gdb". Note that we simply pretend
+ that there are 65 registers, and no "pseudo registers". */
+ set_gdbarch_num_regs (gdbarch, TILEGX_NUM_REGS);
+ set_gdbarch_num_pseudo_regs (gdbarch, 0);
+
+ set_gdbarch_sp_regnum (gdbarch, TILEGX_SP_REGNUM);
+ set_gdbarch_pc_regnum (gdbarch, TILEGX_PC_REGNUM);
+
+ set_gdbarch_register_name (gdbarch, tilegx_register_name);
+ set_gdbarch_register_type (gdbarch, tilegx_register_type);
+
+ set_gdbarch_char_signed (gdbarch, 0);
+ set_gdbarch_short_bit (gdbarch, 2 * TARGET_CHAR_BIT);
+ set_gdbarch_int_bit (gdbarch, 4 * TARGET_CHAR_BIT);
+ set_gdbarch_long_bit (gdbarch, arch_size);
+ set_gdbarch_long_long_bit (gdbarch, 8 * TARGET_CHAR_BIT);
+
+ set_gdbarch_float_bit (gdbarch, 4 * TARGET_CHAR_BIT);
+ set_gdbarch_double_bit (gdbarch, 8 * TARGET_CHAR_BIT);
+ set_gdbarch_long_double_bit (gdbarch, 8 * TARGET_CHAR_BIT);
+
+ set_gdbarch_ptr_bit (gdbarch, arch_size);
+ set_gdbarch_addr_bit (gdbarch, arch_size);
+
+ set_gdbarch_cannot_fetch_register (gdbarch,
+ tilegx_cannot_reference_register);
+ set_gdbarch_cannot_store_register (gdbarch,
+ tilegx_cannot_reference_register);
+
+ /* Stack grows down. */
+ set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
+
+ /* Frame Info. */
+ set_gdbarch_unwind_sp (gdbarch, tilegx_unwind_sp);
+ set_gdbarch_unwind_pc (gdbarch, tilegx_unwind_pc);
+ set_gdbarch_dummy_id (gdbarch, tilegx_unwind_dummy_id);
+ set_gdbarch_frame_align (gdbarch, tilegx_frame_align);
+ frame_base_set_default (gdbarch, &tilegx_frame_base);
+
+ set_gdbarch_skip_prologue (gdbarch, tilegx_skip_prologue);
+
+ set_gdbarch_in_function_epilogue_p (gdbarch,
+ tilegx_in_function_epilogue_p);
+
+ /* Map debug registers into internal register numbers. */
+ set_gdbarch_dwarf2_reg_to_regnum (gdbarch, tilegx_dwarf2_reg_to_regnum);
+
+ /* These values and methods are used when gdb calls a target function. */
+ set_gdbarch_push_dummy_call (gdbarch, tilegx_push_dummy_call);
+ set_gdbarch_breakpoint_from_pc (gdbarch, tilegx_breakpoint_from_pc);
+ set_gdbarch_return_value (gdbarch, tilegx_return_value);
+
+ set_gdbarch_print_insn (gdbarch, print_insn_tilegx);
+
+ gdbarch_init_osabi (info, gdbarch);
+
+ dwarf2_append_unwinders (gdbarch);
+ frame_unwind_append_unwinder (gdbarch, &tilegx_frame_unwind);
+
+ return gdbarch;
+}
+
+/* Provide a prototype to silence -Wmissing-prototypes. */
+extern initialize_file_ftype _initialize_tilegx_tdep;
+
+void
+_initialize_tilegx_tdep (void)
+{
+ register_gdbarch_init (bfd_arch_tilegx, tilegx_gdbarch_init);
+}
projects / external / binutils.git / commitdiff