X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Faarch64-tdep.c;h=304d9df7e84b1ba24623397bd2c1038fdea9f65e;hb=598cc9dc84aeaa66e4a77efa9dc8ff03d5532620;hp=2cecad0f857e03cfbce63e8ceee6d2b21dbdf7eb;hpb=f168693bc9d109c387e442119354bd57ecec8267;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/aarch64-tdep.c b/gdb/aarch64-tdep.c index 2cecad0f85..304d9df7e8 100644 --- a/gdb/aarch64-tdep.c +++ b/gdb/aarch64-tdep.c @@ -1,6 +1,6 @@ /* Common target dependent code for GDB on AArch64 systems. - Copyright (C) 2009-2015 Free Software Foundation, Inc. + Copyright (C) 2009-2016 Free Software Foundation, Inc. Contributed by ARM Ltd. This file is part of GDB. @@ -57,9 +57,18 @@ #include "features/aarch64.c" +#include "arch/aarch64-insn.h" + +#include "opcode/aarch64.h" +#include + +#define submask(x) ((1L << ((x) + 1)) - 1) +#define bit(obj,st) (((obj) >> (st)) & 1) +#define bits(obj,st,fn) (((obj) >> (st)) & submask ((fn) - (st))) + /* Pseudo register base numbers. */ #define AARCH64_Q0_REGNUM 0 -#define AARCH64_D0_REGNUM (AARCH64_Q0_REGNUM + 32) +#define AARCH64_D0_REGNUM (AARCH64_Q0_REGNUM + AARCH64_D_REGISTER_COUNT) #define AARCH64_S0_REGNUM (AARCH64_D0_REGNUM + 32) #define AARCH64_H0_REGNUM (AARCH64_S0_REGNUM + 32) #define AARCH64_B0_REGNUM (AARCH64_H0_REGNUM + 32) @@ -179,9 +188,6 @@ struct aarch64_prologue_cache struct trad_frame_saved_reg *saved_regs; }; -/* Toggle this file's internal debugging dump. */ -static int aarch64_debug; - static void show_aarch64_debug (struct ui_file *file, int from_tty, struct cmd_list_element *c, const char *value) @@ -189,482 +195,6 @@ show_aarch64_debug (struct ui_file *file, int from_tty, fprintf_filtered (file, _("AArch64 debugging is %s.\n"), value); } -/* Extract a signed value from a bit field within an instruction - encoding. - - INSN is the instruction opcode. - - WIDTH specifies the width of the bit field to extract (in bits). - - OFFSET specifies the least significant bit of the field where bits - are numbered zero counting from least to most significant. */ - -static int32_t -extract_signed_bitfield (uint32_t insn, unsigned width, unsigned offset) -{ - unsigned shift_l = sizeof (int32_t) * 8 - (offset + width); - unsigned shift_r = sizeof (int32_t) * 8 - width; - - return ((int32_t) insn << shift_l) >> shift_r; -} - -/* Determine if specified bits within an instruction opcode matches a - specific pattern. - - INSN is the instruction opcode. - - MASK specifies the bits within the opcode that are to be tested - agsinst for a match with PATTERN. */ - -static int -decode_masked_match (uint32_t insn, uint32_t mask, uint32_t pattern) -{ - return (insn & mask) == pattern; -} - -/* Decode an opcode if it represents an immediate ADD or SUB instruction. - - ADDR specifies the address of the opcode. - INSN specifies the opcode to test. - RD receives the 'rd' field from the decoded instruction. - RN receives the 'rn' field from the decoded instruction. - - Return 1 if the opcodes matches and is decoded, otherwise 0. */ -static int -decode_add_sub_imm (CORE_ADDR addr, uint32_t insn, unsigned *rd, unsigned *rn, - int32_t *imm) -{ - if ((insn & 0x9f000000) == 0x91000000) - { - unsigned shift; - unsigned op_is_sub; - - *rd = (insn >> 0) & 0x1f; - *rn = (insn >> 5) & 0x1f; - *imm = (insn >> 10) & 0xfff; - shift = (insn >> 22) & 0x3; - op_is_sub = (insn >> 30) & 0x1; - - switch (shift) - { - case 0: - break; - case 1: - *imm <<= 12; - break; - default: - /* UNDEFINED */ - return 0; - } - - if (op_is_sub) - *imm = -*imm; - - if (aarch64_debug) - fprintf_unfiltered (gdb_stdlog, - "decode: 0x%s 0x%x add x%u, x%u, #%d\n", - core_addr_to_string_nz (addr), insn, *rd, *rn, - *imm); - return 1; - } - return 0; -} - -/* Decode an opcode if it represents an ADRP instruction. - - ADDR specifies the address of the opcode. - INSN specifies the opcode to test. - RD receives the 'rd' field from the decoded instruction. - - Return 1 if the opcodes matches and is decoded, otherwise 0. */ - -static int -decode_adrp (CORE_ADDR addr, uint32_t insn, unsigned *rd) -{ - if (decode_masked_match (insn, 0x9f000000, 0x90000000)) - { - *rd = (insn >> 0) & 0x1f; - - if (aarch64_debug) - fprintf_unfiltered (gdb_stdlog, - "decode: 0x%s 0x%x adrp x%u, #?\n", - core_addr_to_string_nz (addr), insn, *rd); - return 1; - } - return 0; -} - -/* Decode an opcode if it represents an branch immediate or branch - and link immediate instruction. - - ADDR specifies the address of the opcode. - INSN specifies the opcode to test. - LINK receives the 'link' bit from the decoded instruction. - OFFSET receives the immediate offset from the decoded instruction. - - Return 1 if the opcodes matches and is decoded, otherwise 0. */ - -static int -decode_b (CORE_ADDR addr, uint32_t insn, unsigned *link, int32_t *offset) -{ - /* b 0001 01ii iiii iiii iiii iiii iiii iiii */ - /* bl 1001 01ii iiii iiii iiii iiii iiii iiii */ - if (decode_masked_match (insn, 0x7c000000, 0x14000000)) - { - *link = insn >> 31; - *offset = extract_signed_bitfield (insn, 26, 0) << 2; - - if (aarch64_debug) - fprintf_unfiltered (gdb_stdlog, - "decode: 0x%s 0x%x %s 0x%s\n", - core_addr_to_string_nz (addr), insn, - *link ? "bl" : "b", - core_addr_to_string_nz (addr + *offset)); - - return 1; - } - return 0; -} - -/* Decode an opcode if it represents a conditional branch instruction. - - ADDR specifies the address of the opcode. - INSN specifies the opcode to test. - COND receives the branch condition field from the decoded - instruction. - OFFSET receives the immediate offset from the decoded instruction. - - Return 1 if the opcodes matches and is decoded, otherwise 0. */ - -static int -decode_bcond (CORE_ADDR addr, uint32_t insn, unsigned *cond, int32_t *offset) -{ - if (decode_masked_match (insn, 0xfe000000, 0x54000000)) - { - *cond = (insn >> 0) & 0xf; - *offset = extract_signed_bitfield (insn, 19, 5) << 2; - - if (aarch64_debug) - fprintf_unfiltered (gdb_stdlog, - "decode: 0x%s 0x%x b<%u> 0x%s\n", - core_addr_to_string_nz (addr), insn, *cond, - core_addr_to_string_nz (addr + *offset)); - return 1; - } - return 0; -} - -/* Decode an opcode if it represents a branch via register instruction. - - ADDR specifies the address of the opcode. - INSN specifies the opcode to test. - LINK receives the 'link' bit from the decoded instruction. - RN receives the 'rn' field from the decoded instruction. - - Return 1 if the opcodes matches and is decoded, otherwise 0. */ - -static int -decode_br (CORE_ADDR addr, uint32_t insn, unsigned *link, unsigned *rn) -{ - /* 8 4 0 6 2 8 4 0 */ - /* blr 110101100011111100000000000rrrrr */ - /* br 110101100001111100000000000rrrrr */ - if (decode_masked_match (insn, 0xffdffc1f, 0xd61f0000)) - { - *link = (insn >> 21) & 1; - *rn = (insn >> 5) & 0x1f; - - if (aarch64_debug) - fprintf_unfiltered (gdb_stdlog, - "decode: 0x%s 0x%x %s 0x%x\n", - core_addr_to_string_nz (addr), insn, - *link ? "blr" : "br", *rn); - - return 1; - } - return 0; -} - -/* Decode an opcode if it represents a CBZ or CBNZ instruction. - - ADDR specifies the address of the opcode. - INSN specifies the opcode to test. - IS64 receives the 'sf' field from the decoded instruction. - OP receives the 'op' field from the decoded instruction. - RN receives the 'rn' field from the decoded instruction. - OFFSET receives the 'imm19' field from the decoded instruction. - - Return 1 if the opcodes matches and is decoded, otherwise 0. */ - -static int -decode_cb (CORE_ADDR addr, - uint32_t insn, int *is64, unsigned *op, unsigned *rn, - int32_t *offset) -{ - if (decode_masked_match (insn, 0x7e000000, 0x34000000)) - { - /* cbz T011 010o iiii iiii iiii iiii iiir rrrr */ - /* cbnz T011 010o iiii iiii iiii iiii iiir rrrr */ - - *rn = (insn >> 0) & 0x1f; - *is64 = (insn >> 31) & 0x1; - *op = (insn >> 24) & 0x1; - *offset = extract_signed_bitfield (insn, 19, 5) << 2; - - if (aarch64_debug) - fprintf_unfiltered (gdb_stdlog, - "decode: 0x%s 0x%x %s 0x%s\n", - core_addr_to_string_nz (addr), insn, - *op ? "cbnz" : "cbz", - core_addr_to_string_nz (addr + *offset)); - return 1; - } - return 0; -} - -/* Decode an opcode if it represents a ERET instruction. - - ADDR specifies the address of the opcode. - INSN specifies the opcode to test. - - Return 1 if the opcodes matches and is decoded, otherwise 0. */ - -static int -decode_eret (CORE_ADDR addr, uint32_t insn) -{ - /* eret 1101 0110 1001 1111 0000 0011 1110 0000 */ - if (insn == 0xd69f03e0) - { - if (aarch64_debug) - fprintf_unfiltered (gdb_stdlog, "decode: 0x%s 0x%x eret\n", - core_addr_to_string_nz (addr), insn); - return 1; - } - return 0; -} - -/* Decode an opcode if it represents a MOVZ instruction. - - ADDR specifies the address of the opcode. - INSN specifies the opcode to test. - RD receives the 'rd' field from the decoded instruction. - - Return 1 if the opcodes matches and is decoded, otherwise 0. */ - -static int -decode_movz (CORE_ADDR addr, uint32_t insn, unsigned *rd) -{ - if (decode_masked_match (insn, 0xff800000, 0x52800000)) - { - *rd = (insn >> 0) & 0x1f; - - if (aarch64_debug) - fprintf_unfiltered (gdb_stdlog, - "decode: 0x%s 0x%x movz x%u, #?\n", - core_addr_to_string_nz (addr), insn, *rd); - return 1; - } - return 0; -} - -/* Decode an opcode if it represents a ORR (shifted register) - instruction. - - ADDR specifies the address of the opcode. - INSN specifies the opcode to test. - RD receives the 'rd' field from the decoded instruction. - RN receives the 'rn' field from the decoded instruction. - RM receives the 'rm' field from the decoded instruction. - IMM receives the 'imm6' field from the decoded instruction. - - Return 1 if the opcodes matches and is decoded, otherwise 0. */ - -static int -decode_orr_shifted_register_x (CORE_ADDR addr, - uint32_t insn, unsigned *rd, unsigned *rn, - unsigned *rm, int32_t *imm) -{ - if (decode_masked_match (insn, 0xff200000, 0xaa000000)) - { - *rd = (insn >> 0) & 0x1f; - *rn = (insn >> 5) & 0x1f; - *rm = (insn >> 16) & 0x1f; - *imm = (insn >> 10) & 0x3f; - - if (aarch64_debug) - fprintf_unfiltered (gdb_stdlog, - "decode: 0x%s 0x%x orr x%u, x%u, x%u, #%u\n", - core_addr_to_string_nz (addr), insn, *rd, - *rn, *rm, *imm); - return 1; - } - return 0; -} - -/* Decode an opcode if it represents a RET instruction. - - ADDR specifies the address of the opcode. - INSN specifies the opcode to test. - RN receives the 'rn' field from the decoded instruction. - - Return 1 if the opcodes matches and is decoded, otherwise 0. */ - -static int -decode_ret (CORE_ADDR addr, uint32_t insn, unsigned *rn) -{ - if (decode_masked_match (insn, 0xfffffc1f, 0xd65f0000)) - { - *rn = (insn >> 5) & 0x1f; - if (aarch64_debug) - fprintf_unfiltered (gdb_stdlog, - "decode: 0x%s 0x%x ret x%u\n", - core_addr_to_string_nz (addr), insn, *rn); - return 1; - } - return 0; -} - -/* Decode an opcode if it represents the following instruction: - STP rt, rt2, [rn, #imm] - - ADDR specifies the address of the opcode. - INSN specifies the opcode to test. - RT1 receives the 'rt' field from the decoded instruction. - RT2 receives the 'rt2' field from the decoded instruction. - RN receives the 'rn' field from the decoded instruction. - IMM receives the 'imm' field from the decoded instruction. - - Return 1 if the opcodes matches and is decoded, otherwise 0. */ - -static int -decode_stp_offset (CORE_ADDR addr, - uint32_t insn, - unsigned *rt1, unsigned *rt2, unsigned *rn, int32_t *imm) -{ - if (decode_masked_match (insn, 0xffc00000, 0xa9000000)) - { - *rt1 = (insn >> 0) & 0x1f; - *rn = (insn >> 5) & 0x1f; - *rt2 = (insn >> 10) & 0x1f; - *imm = extract_signed_bitfield (insn, 7, 15); - *imm <<= 3; - - if (aarch64_debug) - fprintf_unfiltered (gdb_stdlog, - "decode: 0x%s 0x%x stp x%u, x%u, [x%u + #%d]\n", - core_addr_to_string_nz (addr), insn, - *rt1, *rt2, *rn, *imm); - return 1; - } - return 0; -} - -/* Decode an opcode if it represents the following instruction: - STP rt, rt2, [rn, #imm]! - - ADDR specifies the address of the opcode. - INSN specifies the opcode to test. - RT1 receives the 'rt' field from the decoded instruction. - RT2 receives the 'rt2' field from the decoded instruction. - RN receives the 'rn' field from the decoded instruction. - IMM receives the 'imm' field from the decoded instruction. - - Return 1 if the opcodes matches and is decoded, otherwise 0. */ - -static int -decode_stp_offset_wb (CORE_ADDR addr, - uint32_t insn, - unsigned *rt1, unsigned *rt2, unsigned *rn, - int32_t *imm) -{ - if (decode_masked_match (insn, 0xffc00000, 0xa9800000)) - { - *rt1 = (insn >> 0) & 0x1f; - *rn = (insn >> 5) & 0x1f; - *rt2 = (insn >> 10) & 0x1f; - *imm = extract_signed_bitfield (insn, 7, 15); - *imm <<= 3; - - if (aarch64_debug) - fprintf_unfiltered (gdb_stdlog, - "decode: 0x%s 0x%x stp x%u, x%u, [x%u + #%d]!\n", - core_addr_to_string_nz (addr), insn, - *rt1, *rt2, *rn, *imm); - return 1; - } - return 0; -} - -/* Decode an opcode if it represents the following instruction: - STUR rt, [rn, #imm] - - ADDR specifies the address of the opcode. - INSN specifies the opcode to test. - IS64 receives size field from the decoded instruction. - RT receives the 'rt' field from the decoded instruction. - RN receives the 'rn' field from the decoded instruction. - IMM receives the 'imm' field from the decoded instruction. - - Return 1 if the opcodes matches and is decoded, otherwise 0. */ - -static int -decode_stur (CORE_ADDR addr, uint32_t insn, int *is64, unsigned *rt, - unsigned *rn, int32_t *imm) -{ - if (decode_masked_match (insn, 0xbfe00c00, 0xb8000000)) - { - *is64 = (insn >> 30) & 1; - *rt = (insn >> 0) & 0x1f; - *rn = (insn >> 5) & 0x1f; - *imm = extract_signed_bitfield (insn, 9, 12); - - if (aarch64_debug) - fprintf_unfiltered (gdb_stdlog, - "decode: 0x%s 0x%x stur %c%u, [x%u + #%d]\n", - core_addr_to_string_nz (addr), insn, - *is64 ? 'x' : 'w', *rt, *rn, *imm); - return 1; - } - return 0; -} - -/* Decode an opcode if it represents a TB or TBNZ instruction. - - ADDR specifies the address of the opcode. - INSN specifies the opcode to test. - OP receives the 'op' field from the decoded instruction. - BIT receives the bit position field from the decoded instruction. - RT receives 'rt' field from the decoded instruction. - IMM receives 'imm' field from the decoded instruction. - - Return 1 if the opcodes matches and is decoded, otherwise 0. */ - -static int -decode_tb (CORE_ADDR addr, - uint32_t insn, unsigned *op, unsigned *bit, unsigned *rt, - int32_t *imm) -{ - if (decode_masked_match (insn, 0x7e000000, 0x36000000)) - { - /* tbz b011 0110 bbbb biii iiii iiii iiir rrrr */ - /* tbnz B011 0111 bbbb biii iiii iiii iiir rrrr */ - - *rt = (insn >> 0) & 0x1f; - *op = insn & (1 << 24); - *bit = ((insn >> (31 - 4)) & 0x20) | ((insn >> 19) & 0x1f); - *imm = extract_signed_bitfield (insn, 14, 5) << 2; - - if (aarch64_debug) - fprintf_unfiltered (gdb_stdlog, - "decode: 0x%s 0x%x %s x%u, #%u, 0x%s\n", - core_addr_to_string_nz (addr), insn, - *op ? "tbnz" : "tbz", *rt, *bit, - core_addr_to_string_nz (addr + *imm)); - return 1; - } - return 0; -} - /* Analyze a prologue, looking for a recognizable stack frame and frame pointer. Scan until we encounter a store that could clobber the stack frame unexpectedly, or an unknown instruction. */ @@ -676,11 +206,12 @@ aarch64_analyze_prologue (struct gdbarch *gdbarch, { enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); int i; - pv_t regs[AARCH64_X_REGISTER_COUNT]; + /* Track X registers and D registers in prologue. */ + pv_t regs[AARCH64_X_REGISTER_COUNT + AARCH64_D_REGISTER_COUNT]; struct pv_area *stack; struct cleanup *back_to; - for (i = 0; i < AARCH64_X_REGISTER_COUNT; i++) + for (i = 0; i < AARCH64_X_REGISTER_COUNT + AARCH64_D_REGISTER_COUNT; i++) regs[i] = pv_register (i, 0); stack = make_pv_area (AARCH64_SP_REGNUM, gdbarch_addr_bit (gdbarch)); back_to = make_cleanup_free_pv_area (stack); @@ -688,83 +219,128 @@ aarch64_analyze_prologue (struct gdbarch *gdbarch, for (; start < limit; start += 4) { uint32_t insn; - unsigned rd; - unsigned rn; - unsigned rm; - unsigned rt; - unsigned rt1; - unsigned rt2; - int op_is_sub; - int32_t imm; - unsigned cond; - int is64; - unsigned is_link; - unsigned op; - unsigned bit; - int32_t offset; + aarch64_inst inst; insn = read_memory_unsigned_integer (start, 4, byte_order_for_code); - if (decode_add_sub_imm (start, insn, &rd, &rn, &imm)) - regs[rd] = pv_add_constant (regs[rn], imm); - else if (decode_adrp (start, insn, &rd)) - regs[rd] = pv_unknown (); - else if (decode_b (start, insn, &is_link, &offset)) + if (aarch64_decode_insn (insn, &inst, 1) != 0) + break; + + if (inst.opcode->iclass == addsub_imm + && (inst.opcode->op == OP_ADD + || strcmp ("sub", inst.opcode->name) == 0)) { - /* Stop analysis on branch. */ - break; + unsigned rd = inst.operands[0].reg.regno; + unsigned rn = inst.operands[1].reg.regno; + + gdb_assert (aarch64_num_of_operands (inst.opcode) == 3); + gdb_assert (inst.operands[0].type == AARCH64_OPND_Rd_SP); + gdb_assert (inst.operands[1].type == AARCH64_OPND_Rn_SP); + gdb_assert (inst.operands[2].type == AARCH64_OPND_AIMM); + + if (inst.opcode->op == OP_ADD) + { + regs[rd] = pv_add_constant (regs[rn], + inst.operands[2].imm.value); + } + else + { + regs[rd] = pv_add_constant (regs[rn], + -inst.operands[2].imm.value); + } } - else if (decode_bcond (start, insn, &cond, &offset)) + else if (inst.opcode->iclass == pcreladdr + && inst.operands[1].type == AARCH64_OPND_ADDR_ADRP) + { + gdb_assert (aarch64_num_of_operands (inst.opcode) == 2); + gdb_assert (inst.operands[0].type == AARCH64_OPND_Rd); + + regs[inst.operands[0].reg.regno] = pv_unknown (); + } + else if (inst.opcode->iclass == branch_imm) { /* Stop analysis on branch. */ break; } - else if (decode_br (start, insn, &is_link, &rn)) + else if (inst.opcode->iclass == condbranch) { /* Stop analysis on branch. */ break; } - else if (decode_cb (start, insn, &is64, &op, &rn, &offset)) + else if (inst.opcode->iclass == branch_reg) { /* Stop analysis on branch. */ break; } - else if (decode_eret (start, insn)) + else if (inst.opcode->iclass == compbranch) { /* Stop analysis on branch. */ break; } - else if (decode_movz (start, insn, &rd)) - regs[rd] = pv_unknown (); - else - if (decode_orr_shifted_register_x (start, insn, &rd, &rn, &rm, &imm)) + else if (inst.opcode->op == OP_MOVZ) + { + gdb_assert (inst.operands[0].type == AARCH64_OPND_Rd); + regs[inst.operands[0].reg.regno] = pv_unknown (); + } + else if (inst.opcode->iclass == log_shift + && strcmp (inst.opcode->name, "orr") == 0) { - if (imm == 0 && rn == 31) + unsigned rd = inst.operands[0].reg.regno; + unsigned rn = inst.operands[1].reg.regno; + unsigned rm = inst.operands[2].reg.regno; + + gdb_assert (inst.operands[0].type == AARCH64_OPND_Rd); + gdb_assert (inst.operands[1].type == AARCH64_OPND_Rn); + gdb_assert (inst.operands[2].type == AARCH64_OPND_Rm_SFT); + + if (inst.operands[2].shifter.amount == 0 + && rn == AARCH64_SP_REGNUM) regs[rd] = regs[rm]; else { if (aarch64_debug) - fprintf_unfiltered - (gdb_stdlog, - "aarch64: prologue analysis gave up addr=0x%s " - "opcode=0x%x (orr x register)\n", - core_addr_to_string_nz (start), - insn); + { + debug_printf ("aarch64: prologue analysis gave up " + "addr=%s opcode=0x%x (orr x register)\n", + core_addr_to_string_nz (start), insn); + } break; } } - else if (decode_ret (start, insn, &rn)) - { - /* Stop analysis on branch. */ - break; - } - else if (decode_stur (start, insn, &is64, &rt, &rn, &offset)) + else if (inst.opcode->op == OP_STUR) { - pv_area_store (stack, pv_add_constant (regs[rn], offset), + unsigned rt = inst.operands[0].reg.regno; + unsigned rn = inst.operands[1].addr.base_regno; + int is64 + = (aarch64_get_qualifier_esize (inst.operands[0].qualifier) == 8); + + gdb_assert (aarch64_num_of_operands (inst.opcode) == 2); + gdb_assert (inst.operands[0].type == AARCH64_OPND_Rt); + gdb_assert (inst.operands[1].type == AARCH64_OPND_ADDR_SIMM9); + gdb_assert (!inst.operands[1].addr.offset.is_reg); + + pv_area_store (stack, pv_add_constant (regs[rn], + inst.operands[1].addr.offset.imm), is64 ? 8 : 4, regs[rt]); } - else if (decode_stp_offset (start, insn, &rt1, &rt2, &rn, &imm)) + else if ((inst.opcode->iclass == ldstpair_off + || (inst.opcode->iclass == ldstpair_indexed + && inst.operands[2].addr.preind)) + && strcmp ("stp", inst.opcode->name) == 0) { + /* STP with addressing mode Pre-indexed and Base register. */ + unsigned rt1; + unsigned rt2; + unsigned rn = inst.operands[2].addr.base_regno; + int32_t imm = inst.operands[2].addr.offset.imm; + + gdb_assert (inst.operands[0].type == AARCH64_OPND_Rt + || inst.operands[0].type == AARCH64_OPND_Ft); + gdb_assert (inst.operands[1].type == AARCH64_OPND_Rt2 + || inst.operands[1].type == AARCH64_OPND_Ft2); + gdb_assert (inst.operands[2].type == AARCH64_OPND_ADDR_SIMM7); + gdb_assert (!inst.operands[2].addr.offset.is_reg); + /* If recording this store would invalidate the store area (perhaps because rn is not known) then we should abandon further prologue analysis. */ @@ -776,31 +352,27 @@ aarch64_analyze_prologue (struct gdbarch *gdbarch, pv_add_constant (regs[rn], imm + 8))) break; + rt1 = inst.operands[0].reg.regno; + rt2 = inst.operands[1].reg.regno; + if (inst.operands[0].type == AARCH64_OPND_Ft) + { + /* Only bottom 64-bit of each V register (D register) need + to be preserved. */ + gdb_assert (inst.operands[0].qualifier == AARCH64_OPND_QLF_S_D); + rt1 += AARCH64_X_REGISTER_COUNT; + rt2 += AARCH64_X_REGISTER_COUNT; + } + pv_area_store (stack, pv_add_constant (regs[rn], imm), 8, regs[rt1]); pv_area_store (stack, pv_add_constant (regs[rn], imm + 8), 8, regs[rt2]); - } - else if (decode_stp_offset_wb (start, insn, &rt1, &rt2, &rn, &imm)) - { - /* If recording this store would invalidate the store area - (perhaps because rn is not known) then we should abandon - further prologue analysis. */ - if (pv_area_store_would_trash (stack, - pv_add_constant (regs[rn], imm))) - break; - if (pv_area_store_would_trash (stack, - pv_add_constant (regs[rn], imm + 8))) - break; + if (inst.operands[2].addr.writeback) + regs[rn] = pv_add_constant (regs[rn], imm); - pv_area_store (stack, pv_add_constant (regs[rn], imm), 8, - regs[rt1]); - pv_area_store (stack, pv_add_constant (regs[rn], imm + 8), 8, - regs[rt2]); - regs[rn] = pv_add_constant (regs[rn], imm); } - else if (decode_tb (start, insn, &op, &bit, &rn, &offset)) + else if (inst.opcode->iclass == testbranch) { /* Stop analysis on branch. */ break; @@ -808,10 +380,11 @@ aarch64_analyze_prologue (struct gdbarch *gdbarch, else { if (aarch64_debug) - fprintf_unfiltered (gdb_stdlog, - "aarch64: prologue analysis gave up addr=0x%s" - " opcode=0x%x\n", - core_addr_to_string_nz (start), insn); + { + debug_printf ("aarch64: prologue analysis gave up addr=%s" + " opcode=0x%x\n", + core_addr_to_string_nz (start), insn); + } break; } } @@ -849,6 +422,16 @@ aarch64_analyze_prologue (struct gdbarch *gdbarch, cache->saved_regs[i].addr = offset; } + for (i = 0; i < AARCH64_D_REGISTER_COUNT; i++) + { + int regnum = gdbarch_num_regs (gdbarch); + CORE_ADDR offset; + + if (pv_area_find_reg (stack, gdbarch, i + AARCH64_X_REGISTER_COUNT, + &offset)) + cache->saved_regs[i + regnum + AARCH64_D0_REGNUM].addr = offset; + } + do_cleanups (back_to); return start; } @@ -858,10 +441,7 @@ aarch64_analyze_prologue (struct gdbarch *gdbarch, static CORE_ADDR aarch64_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) { - unsigned long inst; - CORE_ADDR skip_pc; CORE_ADDR func_addr, limit_pc; - struct symtab_and_line sal; /* See if we can determine the end of the prologue via the symbol table. If so, then return either PC, or the PC after the @@ -872,7 +452,7 @@ aarch64_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) = skip_prologue_using_sal (gdbarch, func_addr); if (post_prologue_pc != 0) - return max (pc, post_prologue_pc); + return std::max (pc, post_prologue_pc); } /* Can't determine prologue from the symbol table, need to examine @@ -925,15 +505,12 @@ aarch64_scan_prologue (struct frame_info *this_frame, prologue_end = sal.end; } - prologue_end = min (prologue_end, prev_pc); + prologue_end = std::min (prologue_end, prev_pc); aarch64_analyze_prologue (gdbarch, prologue_start, prologue_end, cache); } else { CORE_ADDR frame_loc; - LONGEST saved_fp; - LONGEST saved_lr; - enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); frame_loc = get_frame_register_unsigned (this_frame, AARCH64_FP_REGNUM); if (frame_loc == 0) @@ -990,7 +567,7 @@ aarch64_make_prologue_cache (struct frame_info *this_frame, void **this_cache) struct aarch64_prologue_cache *cache; if (*this_cache != NULL) - return *this_cache; + return (struct aarch64_prologue_cache *) *this_cache; cache = FRAME_OBSTACK_ZALLOC (struct aarch64_prologue_cache); cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); @@ -1055,7 +632,6 @@ static struct value * aarch64_prologue_prev_register (struct frame_info *this_frame, void **this_cache, int prev_regnum) { - struct gdbarch *gdbarch = get_frame_arch (this_frame); struct aarch64_prologue_cache *cache = aarch64_make_prologue_cache (this_frame, this_cache); @@ -1115,7 +691,7 @@ aarch64_make_stub_cache (struct frame_info *this_frame, void **this_cache) struct aarch64_prologue_cache *cache; if (*this_cache != NULL) - return *this_cache; + return (struct aarch64_prologue_cache *) *this_cache; cache = FRAME_OBSTACK_ZALLOC (struct aarch64_prologue_cache); cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); @@ -1259,7 +835,6 @@ static struct value * aarch64_dwarf2_prev_register (struct frame_info *this_frame, void **this_cache, int regnum) { - struct gdbarch *gdbarch = get_frame_arch (this_frame); CORE_ADDR lr; switch (regnum) @@ -1298,8 +873,9 @@ aarch64_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum, typedef struct { - /* Value to pass on stack. */ - const void *data; + /* Value to pass on stack. It can be NULL if this item is for stack + padding. */ + const gdb_byte *data; /* Size in bytes of value to pass on stack. */ int len; @@ -1337,6 +913,17 @@ aarch64_type_align (struct type *t) return TYPE_LENGTH (t); case TYPE_CODE_ARRAY: + if (TYPE_VECTOR (t)) + { + /* Use the natural alignment for vector types (the same for + scalar type), but the maximum alignment is 128-bit. */ + if (TYPE_LENGTH (t) > 16) + return 16; + else + return TYPE_LENGTH (t); + } + else + return aarch64_type_align (TYPE_TARGET_TYPE (t)); case TYPE_CODE_COMPLEX: return aarch64_type_align (TYPE_TARGET_TYPE (t)); @@ -1353,18 +940,26 @@ aarch64_type_align (struct type *t) } } -/* Return 1 if *TY is a homogeneous floating-point aggregate as - defined in the AAPCS64 ABI document; otherwise return 0. */ +/* Return 1 if *TY is a homogeneous floating-point aggregate or + homogeneous short-vector aggregate as defined in the AAPCS64 ABI + document; otherwise return 0. */ static int -is_hfa (struct type *ty) +is_hfa_or_hva (struct type *ty) { switch (TYPE_CODE (ty)) { case TYPE_CODE_ARRAY: { struct type *target_ty = TYPE_TARGET_TYPE (ty); - if (TYPE_CODE (target_ty) == TYPE_CODE_FLT && TYPE_LENGTH (ty) <= 4) + + if (TYPE_VECTOR (ty)) + return 0; + + if (TYPE_LENGTH (ty) <= 4 /* HFA or HVA has at most 4 members. */ + && (TYPE_CODE (target_ty) == TYPE_CODE_FLT /* HFA */ + || (TYPE_CODE (target_ty) == TYPE_CODE_ARRAY /* HVA */ + && TYPE_VECTOR (target_ty)))) return 1; break; } @@ -1372,12 +967,15 @@ is_hfa (struct type *ty) case TYPE_CODE_UNION: case TYPE_CODE_STRUCT: { + /* HFA or HVA has at most four members. */ if (TYPE_NFIELDS (ty) > 0 && TYPE_NFIELDS (ty) <= 4) { struct type *member0_type; member0_type = check_typedef (TYPE_FIELD_TYPE (ty, 0)); - if (TYPE_CODE (member0_type) == TYPE_CODE_FLT) + if (TYPE_CODE (member0_type) == TYPE_CODE_FLT + || (TYPE_CODE (member0_type) == TYPE_CODE_ARRAY + && TYPE_VECTOR (member0_type))) { int i; @@ -1432,12 +1030,13 @@ struct aarch64_call_info static void pass_in_x (struct gdbarch *gdbarch, struct regcache *regcache, struct aarch64_call_info *info, struct type *type, - const bfd_byte *buf) + struct value *arg) { enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); int len = TYPE_LENGTH (type); enum type_code typecode = TYPE_CODE (type); int regnum = AARCH64_X0_REGNUM + info->ngrn; + const bfd_byte *buf = value_contents (arg); info->argnum++; @@ -1455,10 +1054,11 @@ pass_in_x (struct gdbarch *gdbarch, struct regcache *regcache, regval <<= ((X_REGISTER_SIZE - partial_len) * TARGET_CHAR_BIT); if (aarch64_debug) - fprintf_unfiltered (gdb_stdlog, "arg %d in %s = 0x%s\n", - info->argnum, - gdbarch_register_name (gdbarch, regnum), - phex (regval, X_REGISTER_SIZE)); + { + debug_printf ("arg %d in %s = 0x%s\n", info->argnum, + gdbarch_register_name (gdbarch, regnum), + phex (regval, X_REGISTER_SIZE)); + } regcache_cooked_write_unsigned (regcache, regnum, regval); len -= partial_len; buf += partial_len; @@ -1475,21 +1075,27 @@ static int pass_in_v (struct gdbarch *gdbarch, struct regcache *regcache, struct aarch64_call_info *info, - const bfd_byte *buf) + int len, const bfd_byte *buf) { if (info->nsrn < 8) { - enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); int regnum = AARCH64_V0_REGNUM + info->nsrn; + gdb_byte reg[V_REGISTER_SIZE]; info->argnum++; info->nsrn++; - regcache_cooked_write (regcache, regnum, buf); + memset (reg, 0, sizeof (reg)); + /* PCS C.1, the argument is allocated to the least significant + bits of V register. */ + memcpy (reg, buf, len); + regcache_cooked_write (regcache, regnum, reg); + if (aarch64_debug) - fprintf_unfiltered (gdb_stdlog, "arg %d in %s\n", - info->argnum, - gdbarch_register_name (gdbarch, regnum)); + { + debug_printf ("arg %d in %s\n", info->argnum, + gdbarch_register_name (gdbarch, regnum)); + } return 1; } info->nsrn = 8; @@ -1500,8 +1106,9 @@ pass_in_v (struct gdbarch *gdbarch, static void pass_on_stack (struct aarch64_call_info *info, struct type *type, - const bfd_byte *buf) + struct value *arg) { + const bfd_byte *buf = value_contents (arg); int len = TYPE_LENGTH (type); int align; stack_item_t item; @@ -1519,8 +1126,10 @@ pass_on_stack (struct aarch64_call_info *info, struct type *type, align = 16; if (aarch64_debug) - fprintf_unfiltered (gdb_stdlog, "arg %d len=%d @ sp + %d\n", - info->argnum, len, info->nsaa); + { + debug_printf ("arg %d len=%d @ sp + %d\n", info->argnum, len, + info->nsaa); + } item.len = len; item.data = buf; @@ -1533,7 +1142,7 @@ pass_on_stack (struct aarch64_call_info *info, struct type *type, int pad = align - (info->nsaa & (align - 1)); item.len = pad; - item.data = buf; + item.data = NULL; VEC_safe_push (stack_item_t, info->si, &item); info->nsaa += pad; @@ -1547,7 +1156,7 @@ pass_on_stack (struct aarch64_call_info *info, struct type *type, static void pass_in_x_or_stack (struct gdbarch *gdbarch, struct regcache *regcache, struct aarch64_call_info *info, struct type *type, - const bfd_byte *buf) + struct value *arg) { int len = TYPE_LENGTH (type); int nregs = (len + X_REGISTER_SIZE - 1) / X_REGISTER_SIZE; @@ -1555,13 +1164,13 @@ pass_in_x_or_stack (struct gdbarch *gdbarch, struct regcache *regcache, /* PCS C.13 - Pass in registers if we have enough spare */ if (info->ngrn + nregs <= 8) { - pass_in_x (gdbarch, regcache, info, type, buf); + pass_in_x (gdbarch, regcache, info, type, arg); info->ngrn += nregs; } else { info->ngrn = 8; - pass_on_stack (info, type, buf); + pass_on_stack (info, type, arg); } } @@ -1573,10 +1182,11 @@ pass_in_v_or_stack (struct gdbarch *gdbarch, struct regcache *regcache, struct aarch64_call_info *info, struct type *type, - const bfd_byte *buf) + struct value *arg) { - if (!pass_in_v (gdbarch, regcache, info, buf)) - pass_on_stack (info, type, buf); + if (!pass_in_v (gdbarch, regcache, info, TYPE_LENGTH (type), + value_contents (arg))) + pass_on_stack (info, type, arg); } /* Implement the "push_dummy_call" gdbarch method. */ @@ -1588,10 +1198,7 @@ aarch64_push_dummy_call (struct gdbarch *gdbarch, struct value *function, struct value **args, CORE_ADDR sp, int struct_return, CORE_ADDR struct_addr) { - int nstack = 0; int argnum; - int x_argreg; - int v_argreg; struct aarch64_call_info info; struct type *func_type; struct type *return_type; @@ -1655,11 +1262,12 @@ aarch64_push_dummy_call (struct gdbarch *gdbarch, struct value *function, if (struct_return || lang_struct_return) { if (aarch64_debug) - fprintf_unfiltered (gdb_stdlog, "struct return in %s = 0x%s\n", - gdbarch_register_name - (gdbarch, - AARCH64_STRUCT_RETURN_REGNUM), - paddress (gdbarch, struct_addr)); + { + debug_printf ("struct return in %s = 0x%s\n", + gdbarch_register_name (gdbarch, + AARCH64_STRUCT_RETURN_REGNUM), + paddress (gdbarch, struct_addr)); + } regcache_cooked_write_unsigned (regcache, AARCH64_STRUCT_RETURN_REGNUM, struct_addr); } @@ -1689,8 +1297,7 @@ aarch64_push_dummy_call (struct gdbarch *gdbarch, struct value *function, arg_type = builtin_type (gdbarch)->builtin_int32; arg = value_cast (arg_type, arg); } - pass_in_x_or_stack (gdbarch, regcache, &info, arg_type, - value_contents (arg)); + pass_in_x_or_stack (gdbarch, regcache, &info, arg_type, arg); break; case TYPE_CODE_COMPLEX: @@ -1700,25 +1307,26 @@ aarch64_push_dummy_call (struct gdbarch *gdbarch, struct value *function, struct type *target_type = check_typedef (TYPE_TARGET_TYPE (arg_type)); - pass_in_v (gdbarch, regcache, &info, buf); pass_in_v (gdbarch, regcache, &info, + TYPE_LENGTH (target_type), buf); + pass_in_v (gdbarch, regcache, &info, + TYPE_LENGTH (target_type), buf + TYPE_LENGTH (target_type)); } else { info.nsrn = 8; - pass_on_stack (&info, arg_type, value_contents (arg)); + pass_on_stack (&info, arg_type, arg); } break; case TYPE_CODE_FLT: - pass_in_v_or_stack (gdbarch, regcache, &info, arg_type, - value_contents (arg)); + pass_in_v_or_stack (gdbarch, regcache, &info, arg_type, arg); break; case TYPE_CODE_STRUCT: case TYPE_CODE_ARRAY: case TYPE_CODE_UNION: - if (is_hfa (arg_type)) + if (is_hfa_or_hva (arg_type)) { int elements = TYPE_NFIELDS (arg_type); @@ -1737,16 +1345,22 @@ aarch64_push_dummy_call (struct gdbarch *gdbarch, struct value *function, struct type *field_type = check_typedef (value_type (field)); - pass_in_v_or_stack (gdbarch, regcache, &info, field_type, - value_contents_writeable (field)); + pass_in_v_or_stack (gdbarch, regcache, &info, + field_type, field); } } else { info.nsrn = 8; - pass_on_stack (&info, arg_type, value_contents (arg)); + pass_on_stack (&info, arg_type, arg); } } + else if (TYPE_CODE (arg_type) == TYPE_CODE_ARRAY + && TYPE_VECTOR (arg_type) && (len == 16 || len == 8)) + { + /* Short vector types are passed in V registers. */ + pass_in_v_or_stack (gdbarch, regcache, &info, arg_type, arg); + } else if (len > 16) { /* PCS B.7 Aggregates larger than 16 bytes are passed by @@ -1761,18 +1375,15 @@ aarch64_push_dummy_call (struct gdbarch *gdbarch, struct value *function, /* Construct the indirection. */ arg_type = lookup_pointer_type (arg_type); arg = value_from_pointer (arg_type, sp); - pass_in_x_or_stack (gdbarch, regcache, &info, arg_type, - value_contents (arg)); + pass_in_x_or_stack (gdbarch, regcache, &info, arg_type, arg); } else /* PCS C.15 / C.18 multiple values pass. */ - pass_in_x_or_stack (gdbarch, regcache, &info, arg_type, - value_contents (arg)); + pass_in_x_or_stack (gdbarch, regcache, &info, arg_type, arg); break; default: - pass_in_x_or_stack (gdbarch, regcache, &info, arg_type, - value_contents (arg)); + pass_in_x_or_stack (gdbarch, regcache, &info, arg_type, arg); break; } } @@ -1786,7 +1397,8 @@ aarch64_push_dummy_call (struct gdbarch *gdbarch, struct value *function, stack_item_t *si = VEC_last (stack_item_t, info.si); sp -= si->len; - write_memory (sp, si->data, si->len); + if (si->data != NULL) + write_memory (sp, si->data, si->len); VEC_pop (stack_item_t, info.si); } @@ -1980,17 +1592,7 @@ aarch64_gdb_print_insn (bfd_vma memaddr, disassemble_info *info) 1101.0100.0010.0000.0000.0000.0000.0000 = 0xd4200000. */ static const gdb_byte aarch64_default_breakpoint[] = {0x00, 0x00, 0x20, 0xd4}; -/* Implement the "breakpoint_from_pc" gdbarch method. */ - -static const gdb_byte * -aarch64_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, - int *lenptr) -{ - struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); - - *lenptr = sizeof (aarch64_default_breakpoint); - return aarch64_default_breakpoint; -} +GDBARCH_BREAKPOINT_MANIPULATION (aarch64, aarch64_default_breakpoint) /* Extract from an array REGS containing the (raw) register state a function return value of type TYPE, and copy that, in virtual @@ -2051,7 +1653,7 @@ aarch64_extract_return_value (struct type *type, struct regcache *regs, memcpy (valbuf, buf, len); valbuf += len; } - else if (is_hfa (type)) + else if (is_hfa_or_hva (type)) { int elements = TYPE_NFIELDS (type); struct type *member_type = check_typedef (TYPE_FIELD_TYPE (type, 0)); @@ -2061,19 +1663,29 @@ aarch64_extract_return_value (struct type *type, struct regcache *regs, for (i = 0; i < elements; i++) { int regno = AARCH64_V0_REGNUM + i; - bfd_byte buf[X_REGISTER_SIZE]; + bfd_byte buf[V_REGISTER_SIZE]; if (aarch64_debug) - fprintf_unfiltered (gdb_stdlog, - "read HFA return value element %d from %s\n", - i + 1, - gdbarch_register_name (gdbarch, regno)); + { + debug_printf ("read HFA or HVA return value element %d from %s\n", + i + 1, + gdbarch_register_name (gdbarch, regno)); + } regcache_cooked_read (regs, regno, buf); memcpy (valbuf, buf, len); valbuf += len; } } + else if (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type) + && (TYPE_LENGTH (type) == 16 || TYPE_LENGTH (type) == 8)) + { + /* Short vector is returned in V register. */ + gdb_byte buf[V_REGISTER_SIZE]; + + regcache_cooked_read (regs, AARCH64_V0_REGNUM, buf); + memcpy (valbuf, buf, TYPE_LENGTH (type)); + } else { /* For a structure or union the behaviour is as if the value had @@ -2101,19 +1713,12 @@ aarch64_extract_return_value (struct type *type, struct regcache *regs, static int aarch64_return_in_memory (struct gdbarch *gdbarch, struct type *type) { - int nRc; - enum type_code code; - type = check_typedef (type); - /* In the AArch64 ABI, "integer" like aggregate types are returned - in registers. For an aggregate type to be integer like, its size - must be less than or equal to 4 * X_REGISTER_SIZE. */ - - if (is_hfa (type)) + if (is_hfa_or_hva (type)) { - /* PCS B.5 If the argument is a Named HFA, then the argument is - used unmodified. */ + /* v0-v7 are used to return values and one register is allocated + for one member. However, HFA or HVA has at most four members. */ return 0; } @@ -2179,7 +1784,7 @@ aarch64_store_return_value (struct type *type, struct regcache *regs, } } } - else if (is_hfa (type)) + else if (is_hfa_or_hva (type)) { int elements = TYPE_NFIELDS (type); struct type *member_type = check_typedef (TYPE_FIELD_TYPE (type, 0)); @@ -2192,16 +1797,26 @@ aarch64_store_return_value (struct type *type, struct regcache *regs, bfd_byte tmpbuf[MAX_REGISTER_SIZE]; if (aarch64_debug) - fprintf_unfiltered (gdb_stdlog, - "write HFA return value element %d to %s\n", - i + 1, - gdbarch_register_name (gdbarch, regno)); + { + debug_printf ("write HFA or HVA return value element %d to %s\n", + i + 1, + gdbarch_register_name (gdbarch, regno)); + } memcpy (tmpbuf, valbuf, len); regcache_cooked_write (regs, regno, tmpbuf); valbuf += len; } } + else if (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type) + && (TYPE_LENGTH (type) == 8 || TYPE_LENGTH (type) == 16)) + { + /* Short vector. */ + gdb_byte buf[V_REGISTER_SIZE]; + + memcpy (buf, valbuf, TYPE_LENGTH (type)); + regcache_cooked_write (regs, AARCH64_V0_REGNUM, buf); + } else { /* For a structure or union the behaviour is as if the value had @@ -2229,7 +1844,6 @@ aarch64_return_value (struct gdbarch *gdbarch, struct value *func_value, struct type *valtype, struct regcache *regcache, gdb_byte *readbuf, const gdb_byte *writebuf) { - struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); if (TYPE_CODE (valtype) == TYPE_CODE_STRUCT || TYPE_CODE (valtype) == TYPE_CODE_UNION @@ -2238,7 +1852,7 @@ aarch64_return_value (struct gdbarch *gdbarch, struct value *func_value, if (aarch64_return_in_memory (gdbarch, valtype)) { if (aarch64_debug) - fprintf_unfiltered (gdb_stdlog, "return value in memory\n"); + debug_printf ("return value in memory\n"); return RETURN_VALUE_STRUCT_CONVENTION; } } @@ -2250,7 +1864,7 @@ aarch64_return_value (struct gdbarch *gdbarch, struct value *func_value, aarch64_extract_return_value (valtype, regcache, readbuf); if (aarch64_debug) - fprintf_unfiltered (gdb_stdlog, "return value in registers\n"); + debug_printf ("return value in registers\n"); return RETURN_VALUE_REGISTER_CONVENTION; } @@ -2482,7 +2096,11 @@ aarch64_pseudo_read_value (struct gdbarch *gdbarch, v_regnum = AARCH64_V0_REGNUM + regnum - AARCH64_S0_REGNUM; status = regcache_raw_read (regcache, v_regnum, reg_buf); - memcpy (buf, reg_buf, S_REGISTER_SIZE); + if (status != REG_VALID) + mark_value_bytes_unavailable (result_value, 0, + TYPE_LENGTH (value_type (result_value))); + else + memcpy (buf, reg_buf, S_REGISTER_SIZE); return result_value; } @@ -2597,7 +2215,7 @@ aarch64_pseudo_write (struct gdbarch *gdbarch, struct regcache *regcache, static struct value * value_of_aarch64_user_reg (struct frame_info *frame, const void *baton) { - const int *reg_p = baton; + const int *reg_p = (const int *) baton; return value_of_register (*reg_p, frame); } @@ -2624,35 +2242,40 @@ aarch64_software_single_step (struct frame_info *frame) int insn_count; int bc_insn_count = 0; /* Conditional branch instruction count. */ int last_breakpoint = 0; /* Defaults to 0 (no breakpoints placed). */ + aarch64_inst inst; + + if (aarch64_decode_insn (insn, &inst, 1) != 0) + return 0; /* Look for a Load Exclusive instruction which begins the sequence. */ - if (!decode_masked_match (insn, 0x3fc00000, 0x08400000)) + if (inst.opcode->iclass != ldstexcl || bit (insn, 22) == 0) return 0; for (insn_count = 0; insn_count < atomic_sequence_length; ++insn_count) { - int32_t offset; - unsigned cond; - loc += insn_size; insn = read_memory_unsigned_integer (loc, insn_size, byte_order_for_code); + if (aarch64_decode_insn (insn, &inst, 1) != 0) + return 0; /* Check if the instruction is a conditional branch. */ - if (decode_bcond (loc, insn, &cond, &offset)) + if (inst.opcode->iclass == condbranch) { + gdb_assert (inst.operands[0].type == AARCH64_OPND_ADDR_PCREL19); + if (bc_insn_count >= 1) return 0; /* It is, so we'll try to set a breakpoint at the destination. */ - breaks[1] = loc + offset; + breaks[1] = loc + inst.operands[0].imm.value; bc_insn_count++; last_breakpoint++; } /* Look for the Store Exclusive which closes the atomic sequence. */ - if (decode_masked_match (insn, 0x3fc00000, 0x08000000)) + if (inst.opcode->iclass == ldstexcl && bit (insn, 22) == 0) { closing_insn = loc; break; @@ -2681,6 +2304,345 @@ aarch64_software_single_step (struct frame_info *frame) return 1; } +struct displaced_step_closure +{ + /* It is true when condition instruction, such as B.CON, TBZ, etc, + is being displaced stepping. */ + int cond; + + /* PC adjustment offset after displaced stepping. */ + int32_t pc_adjust; +}; + +/* Data when visiting instructions for displaced stepping. */ + +struct aarch64_displaced_step_data +{ + struct aarch64_insn_data base; + + /* The address where the instruction will be executed at. */ + CORE_ADDR new_addr; + /* Buffer of instructions to be copied to NEW_ADDR to execute. */ + uint32_t insn_buf[DISPLACED_MODIFIED_INSNS]; + /* Number of instructions in INSN_BUF. */ + unsigned insn_count; + /* Registers when doing displaced stepping. */ + struct regcache *regs; + + struct displaced_step_closure *dsc; +}; + +/* Implementation of aarch64_insn_visitor method "b". */ + +static void +aarch64_displaced_step_b (const int is_bl, const int32_t offset, + struct aarch64_insn_data *data) +{ + struct aarch64_displaced_step_data *dsd + = (struct aarch64_displaced_step_data *) data; + int64_t new_offset = data->insn_addr - dsd->new_addr + offset; + + if (can_encode_int32 (new_offset, 28)) + { + /* Emit B rather than BL, because executing BL on a new address + will get the wrong address into LR. In order to avoid this, + we emit B, and update LR if the instruction is BL. */ + emit_b (dsd->insn_buf, 0, new_offset); + dsd->insn_count++; + } + else + { + /* Write NOP. */ + emit_nop (dsd->insn_buf); + dsd->insn_count++; + dsd->dsc->pc_adjust = offset; + } + + if (is_bl) + { + /* Update LR. */ + regcache_cooked_write_unsigned (dsd->regs, AARCH64_LR_REGNUM, + data->insn_addr + 4); + } +} + +/* Implementation of aarch64_insn_visitor method "b_cond". */ + +static void +aarch64_displaced_step_b_cond (const unsigned cond, const int32_t offset, + struct aarch64_insn_data *data) +{ + struct aarch64_displaced_step_data *dsd + = (struct aarch64_displaced_step_data *) data; + + /* GDB has to fix up PC after displaced step this instruction + differently according to the condition is true or false. Instead + of checking COND against conditional flags, we can use + the following instructions, and GDB can tell how to fix up PC + according to the PC value. + + B.COND TAKEN ; If cond is true, then jump to TAKEN. + INSN1 ; + TAKEN: + INSN2 + */ + + emit_bcond (dsd->insn_buf, cond, 8); + dsd->dsc->cond = 1; + dsd->dsc->pc_adjust = offset; + dsd->insn_count = 1; +} + +/* Dynamically allocate a new register. If we know the register + statically, we should make it a global as above instead of using this + helper function. */ + +static struct aarch64_register +aarch64_register (unsigned num, int is64) +{ + return (struct aarch64_register) { num, is64 }; +} + +/* Implementation of aarch64_insn_visitor method "cb". */ + +static void +aarch64_displaced_step_cb (const int32_t offset, const int is_cbnz, + const unsigned rn, int is64, + struct aarch64_insn_data *data) +{ + struct aarch64_displaced_step_data *dsd + = (struct aarch64_displaced_step_data *) data; + + /* The offset is out of range for a compare and branch + instruction. We can use the following instructions instead: + + CBZ xn, TAKEN ; xn == 0, then jump to TAKEN. + INSN1 ; + TAKEN: + INSN2 + */ + emit_cb (dsd->insn_buf, is_cbnz, aarch64_register (rn, is64), 8); + dsd->insn_count = 1; + dsd->dsc->cond = 1; + dsd->dsc->pc_adjust = offset; +} + +/* Implementation of aarch64_insn_visitor method "tb". */ + +static void +aarch64_displaced_step_tb (const int32_t offset, int is_tbnz, + const unsigned rt, unsigned bit, + struct aarch64_insn_data *data) +{ + struct aarch64_displaced_step_data *dsd + = (struct aarch64_displaced_step_data *) data; + + /* The offset is out of range for a test bit and branch + instruction We can use the following instructions instead: + + TBZ xn, #bit, TAKEN ; xn[bit] == 0, then jump to TAKEN. + INSN1 ; + TAKEN: + INSN2 + + */ + emit_tb (dsd->insn_buf, is_tbnz, bit, aarch64_register (rt, 1), 8); + dsd->insn_count = 1; + dsd->dsc->cond = 1; + dsd->dsc->pc_adjust = offset; +} + +/* Implementation of aarch64_insn_visitor method "adr". */ + +static void +aarch64_displaced_step_adr (const int32_t offset, const unsigned rd, + const int is_adrp, struct aarch64_insn_data *data) +{ + struct aarch64_displaced_step_data *dsd + = (struct aarch64_displaced_step_data *) data; + /* We know exactly the address the ADR{P,} instruction will compute. + We can just write it to the destination register. */ + CORE_ADDR address = data->insn_addr + offset; + + if (is_adrp) + { + /* Clear the lower 12 bits of the offset to get the 4K page. */ + regcache_cooked_write_unsigned (dsd->regs, AARCH64_X0_REGNUM + rd, + address & ~0xfff); + } + else + regcache_cooked_write_unsigned (dsd->regs, AARCH64_X0_REGNUM + rd, + address); + + dsd->dsc->pc_adjust = 4; + emit_nop (dsd->insn_buf); + dsd->insn_count = 1; +} + +/* Implementation of aarch64_insn_visitor method "ldr_literal". */ + +static void +aarch64_displaced_step_ldr_literal (const int32_t offset, const int is_sw, + const unsigned rt, const int is64, + struct aarch64_insn_data *data) +{ + struct aarch64_displaced_step_data *dsd + = (struct aarch64_displaced_step_data *) data; + CORE_ADDR address = data->insn_addr + offset; + struct aarch64_memory_operand zero = { MEMORY_OPERAND_OFFSET, 0 }; + + regcache_cooked_write_unsigned (dsd->regs, AARCH64_X0_REGNUM + rt, + address); + + if (is_sw) + dsd->insn_count = emit_ldrsw (dsd->insn_buf, aarch64_register (rt, 1), + aarch64_register (rt, 1), zero); + else + dsd->insn_count = emit_ldr (dsd->insn_buf, aarch64_register (rt, is64), + aarch64_register (rt, 1), zero); + + dsd->dsc->pc_adjust = 4; +} + +/* Implementation of aarch64_insn_visitor method "others". */ + +static void +aarch64_displaced_step_others (const uint32_t insn, + struct aarch64_insn_data *data) +{ + struct aarch64_displaced_step_data *dsd + = (struct aarch64_displaced_step_data *) data; + + aarch64_emit_insn (dsd->insn_buf, insn); + dsd->insn_count = 1; + + if ((insn & 0xfffffc1f) == 0xd65f0000) + { + /* RET */ + dsd->dsc->pc_adjust = 0; + } + else + dsd->dsc->pc_adjust = 4; +} + +static const struct aarch64_insn_visitor visitor = +{ + aarch64_displaced_step_b, + aarch64_displaced_step_b_cond, + aarch64_displaced_step_cb, + aarch64_displaced_step_tb, + aarch64_displaced_step_adr, + aarch64_displaced_step_ldr_literal, + aarch64_displaced_step_others, +}; + +/* Implement the "displaced_step_copy_insn" gdbarch method. */ + +struct displaced_step_closure * +aarch64_displaced_step_copy_insn (struct gdbarch *gdbarch, + CORE_ADDR from, CORE_ADDR to, + struct regcache *regs) +{ + struct displaced_step_closure *dsc = NULL; + enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); + uint32_t insn = read_memory_unsigned_integer (from, 4, byte_order_for_code); + struct aarch64_displaced_step_data dsd; + aarch64_inst inst; + + if (aarch64_decode_insn (insn, &inst, 1) != 0) + return NULL; + + /* Look for a Load Exclusive instruction which begins the sequence. */ + if (inst.opcode->iclass == ldstexcl && bit (insn, 22)) + { + /* We can't displaced step atomic sequences. */ + return NULL; + } + + dsc = XCNEW (struct displaced_step_closure); + dsd.base.insn_addr = from; + dsd.new_addr = to; + dsd.regs = regs; + dsd.dsc = dsc; + dsd.insn_count = 0; + aarch64_relocate_instruction (insn, &visitor, + (struct aarch64_insn_data *) &dsd); + gdb_assert (dsd.insn_count <= DISPLACED_MODIFIED_INSNS); + + if (dsd.insn_count != 0) + { + int i; + + /* Instruction can be relocated to scratch pad. Copy + relocated instruction(s) there. */ + for (i = 0; i < dsd.insn_count; i++) + { + if (debug_displaced) + { + debug_printf ("displaced: writing insn "); + debug_printf ("%.8x", dsd.insn_buf[i]); + debug_printf (" at %s\n", paddress (gdbarch, to + i * 4)); + } + write_memory_unsigned_integer (to + i * 4, 4, byte_order_for_code, + (ULONGEST) dsd.insn_buf[i]); + } + } + else + { + xfree (dsc); + dsc = NULL; + } + + return dsc; +} + +/* Implement the "displaced_step_fixup" gdbarch method. */ + +void +aarch64_displaced_step_fixup (struct gdbarch *gdbarch, + struct displaced_step_closure *dsc, + CORE_ADDR from, CORE_ADDR to, + struct regcache *regs) +{ + if (dsc->cond) + { + ULONGEST pc; + + regcache_cooked_read_unsigned (regs, AARCH64_PC_REGNUM, &pc); + if (pc - to == 8) + { + /* Condition is true. */ + } + else if (pc - to == 4) + { + /* Condition is false. */ + dsc->pc_adjust = 4; + } + else + gdb_assert_not_reached ("Unexpected PC value after displaced stepping"); + } + + if (dsc->pc_adjust != 0) + { + if (debug_displaced) + { + debug_printf ("displaced: fixup: set PC to %s:%d\n", + paddress (gdbarch, from), dsc->pc_adjust); + } + regcache_cooked_write_unsigned (regs, AARCH64_PC_REGNUM, + from + dsc->pc_adjust); + } +} + +/* Implement the "displaced_step_hw_singlestep" gdbarch method. */ + +int +aarch64_displaced_step_hw_singlestep (struct gdbarch *gdbarch, + struct displaced_step_closure *closure) +{ + return 1; +} + /* Initialize the current architecture based on INFO. If possible, re-use an architecture from ARCHES, which is a list of architectures already created during this debugging session. @@ -2697,7 +2659,6 @@ aarch64_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) struct tdesc_arch_data *tdesc_data = NULL; const struct target_desc *tdesc = info.target_desc; int i; - int have_fpa_registers = 1; int valid_p = 1; const struct tdesc_feature *feature; int num_regs = 0; @@ -2770,7 +2731,7 @@ aarch64_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) return best_arch->gdbarch; } - tdep = xcalloc (1, sizeof (struct gdbarch_tdep)); + tdep = XCNEW (struct gdbarch_tdep); gdbarch = gdbarch_alloc (&info, tdep); /* This should be low enough for everything. */ @@ -2793,7 +2754,7 @@ aarch64_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) set_gdbarch_inner_than (gdbarch, core_addr_lessthan); /* Breakpoint manipulation. */ - set_gdbarch_breakpoint_from_pc (gdbarch, aarch64_breakpoint_from_pc); + SET_GDBARCH_BREAKPOINT_MANIPULATION (aarch64); set_gdbarch_have_nonsteppable_watchpoint (gdbarch, 1); set_gdbarch_software_single_step (gdbarch, aarch64_software_single_step); @@ -2904,10 +2865,6 @@ When on, AArch64 specific debugging is enabled."), /* AArch64 process record-replay related structures, defines etc. */ -#define submask(x) ((1L << ((x) + 1)) - 1) -#define bit(obj,st) (((obj) >> (st)) & 1) -#define bits(obj,st,fn) (((obj) >> (st)) & submask ((fn) - (st))) - #define REG_ALLOC(REGS, LENGTH, RECORD_BUF) \ do \ { \ @@ -3042,11 +2999,10 @@ aarch64_record_data_proc_reg (insn_decode_record *aarch64_insn_r) static unsigned int aarch64_record_data_proc_imm (insn_decode_record *aarch64_insn_r) { - uint8_t reg_rd, insn_bit28, insn_bit23, insn_bits24_27, setflags; + uint8_t reg_rd, insn_bit23, insn_bits24_27, setflags; uint32_t record_buf[4]; reg_rd = bits (aarch64_insn_r->aarch64_insn, 0, 4); - insn_bit28 = bit (aarch64_insn_r->aarch64_insn, 28); insn_bit23 = bit (aarch64_insn_r->aarch64_insn, 23); insn_bits24_27 = bits (aarch64_insn_r->aarch64_insn, 24, 27); @@ -3183,10 +3139,7 @@ aarch64_record_asimd_load_store (insn_decode_record *aarch64_insn_r) regcache_raw_read_unsigned (aarch64_insn_r->regcache, reg_rn, &address); if (record_debug) - { - fprintf_unfiltered (gdb_stdlog, - "Process record: Advanced SIMD load/store\n"); - } + debug_printf ("Process record: Advanced SIMD load/store\n"); /* Load/store single structure. */ if (bit (aarch64_insn_r->aarch64_insn, 24)) @@ -3234,15 +3187,17 @@ aarch64_record_asimd_load_store (insn_decode_record *aarch64_insn_r) else { for (sindex = 0; sindex < selem; sindex++) - if (bit (aarch64_insn_r->aarch64_insn, 22)) - record_buf[reg_index++] = reg_rt + AARCH64_V0_REGNUM; - else - { - record_buf_mem[mem_index++] = esize / 8; - record_buf_mem[mem_index++] = address + addr_offset; - } - addr_offset = addr_offset + (esize / 8); - reg_rt = (reg_rt + 1) % 32; + { + if (bit (aarch64_insn_r->aarch64_insn, 22)) + record_buf[reg_index++] = reg_rt + AARCH64_V0_REGNUM; + else + { + record_buf_mem[mem_index++] = esize / 8; + record_buf_mem[mem_index++] = address + addr_offset; + } + addr_offset = addr_offset + (esize / 8); + reg_rt = (reg_rt + 1) % 32; + } } } /* Load/store multiple structure. */ @@ -3360,10 +3315,7 @@ aarch64_record_load_store (insn_decode_record *aarch64_insn_r) if (insn_bits24_27 == 0x08 && insn_bits28_29 == 0x00) { if (record_debug) - { - fprintf_unfiltered (gdb_stdlog, - "Process record: load/store exclusive\n"); - } + debug_printf ("Process record: load/store exclusive\n"); if (ld_flag) { @@ -3398,10 +3350,7 @@ aarch64_record_load_store (insn_decode_record *aarch64_insn_r) else if ((insn_bits24_27 & 0x0b) == 0x08 && insn_bits28_29 == 0x01) { if (record_debug) - { - fprintf_unfiltered (gdb_stdlog, - "Process record: load register (literal)\n"); - } + debug_printf ("Process record: load register (literal)\n"); if (vector_flag) record_buf[0] = reg_rt + AARCH64_V0_REGNUM; else @@ -3412,10 +3361,7 @@ aarch64_record_load_store (insn_decode_record *aarch64_insn_r) else if ((insn_bits24_27 & 0x0a) == 0x08 && insn_bits28_29 == 0x02) { if (record_debug) - { - fprintf_unfiltered (gdb_stdlog, - "Process record: load/store pair\n"); - } + debug_printf ("Process record: load/store pair\n"); if (ld_flag) { @@ -3476,10 +3422,9 @@ aarch64_record_load_store (insn_decode_record *aarch64_insn_r) if (record_debug) { - fprintf_unfiltered (gdb_stdlog, - "Process record: load/store (unsigned immediate):" - " size %x V %d opc %x\n", size_bits, vector_flag, - opc); + debug_printf ("Process record: load/store (unsigned immediate):" + " size %x V %d opc %x\n", size_bits, vector_flag, + opc); } if (!ld_flag) @@ -3509,10 +3454,7 @@ aarch64_record_load_store (insn_decode_record *aarch64_insn_r) && insn_bits10_11 == 0x02 && insn_bit21) { if (record_debug) - { - fprintf_unfiltered (gdb_stdlog, - "Process record: load/store (register offset)\n"); - } + debug_printf ("Process record: load/store (register offset)\n"); opc = bits (aarch64_insn_r->aarch64_insn, 22, 23); if (!(opc >> 1)) if (opc & 0x01) @@ -3527,7 +3469,8 @@ aarch64_record_load_store (insn_decode_record *aarch64_insn_r) if (!ld_flag) { - uint64_t reg_rm_val; + ULONGEST reg_rm_val; + regcache_raw_read_unsigned (aarch64_insn_r->regcache, bits (aarch64_insn_r->aarch64_insn, 16, 20), ®_rm_val); if (bit (aarch64_insn_r->aarch64_insn, 12)) @@ -3557,8 +3500,8 @@ aarch64_record_load_store (insn_decode_record *aarch64_insn_r) { if (record_debug) { - fprintf_unfiltered (gdb_stdlog, - "Process record: load/store (immediate and unprivileged)\n"); + debug_printf ("Process record: load/store " + "(immediate and unprivileged)\n"); } opc = bits (aarch64_insn_r->aarch64_insn, 22, 23); if (!(opc >> 1)) @@ -3634,10 +3577,7 @@ aarch64_record_data_proc_simd_fp (insn_decode_record *aarch64_insn_r) insn_bit21 = bit (aarch64_insn_r->aarch64_insn, 21); if (record_debug) - { - fprintf_unfiltered (gdb_stdlog, - "Process record: data processing SIMD/FP: "); - } + debug_printf ("Process record: data processing SIMD/FP: "); if ((insn_bits28_31 & 0x05) == 0x01 && insn_bits24_27 == 0x0e) { @@ -3645,7 +3585,7 @@ aarch64_record_data_proc_simd_fp (insn_decode_record *aarch64_insn_r) if (!insn_bit21) { if (record_debug) - fprintf_unfiltered (gdb_stdlog, "FP - fixed point conversion"); + debug_printf ("FP - fixed point conversion"); if ((opcode >> 1) == 0x0 && rmode == 0x03) record_buf[0] = reg_rd; @@ -3656,7 +3596,7 @@ aarch64_record_data_proc_simd_fp (insn_decode_record *aarch64_insn_r) else if (insn_bits10_11 == 0x01) { if (record_debug) - fprintf_unfiltered (gdb_stdlog, "FP - conditional compare"); + debug_printf ("FP - conditional compare"); record_buf[0] = AARCH64_CPSR_REGNUM; } @@ -3665,7 +3605,7 @@ aarch64_record_data_proc_simd_fp (insn_decode_record *aarch64_insn_r) else if (insn_bits10_11 == 0x02 || insn_bits10_11 == 0x03) { if (record_debug) - fprintf_unfiltered (gdb_stdlog, "FP - DP (2-source)"); + debug_printf ("FP - DP (2-source)"); record_buf[0] = reg_rd + AARCH64_V0_REGNUM; } @@ -3676,14 +3616,14 @@ aarch64_record_data_proc_simd_fp (insn_decode_record *aarch64_insn_r) || (insn_bits12_15 & 0x07) == 0x04) { if (record_debug) - fprintf_unfiltered (gdb_stdlog, "FP - immediate"); + debug_printf ("FP - immediate"); record_buf[0] = reg_rd + AARCH64_V0_REGNUM; } /* Floating point - compare instructions. */ else if ((insn_bits12_15 & 0x03) == 0x02) { if (record_debug) - fprintf_unfiltered (gdb_stdlog, "FP - immediate"); + debug_printf ("FP - immediate"); record_buf[0] = AARCH64_CPSR_REGNUM; } /* Floating point - integer conversions instructions. */ @@ -3693,7 +3633,7 @@ aarch64_record_data_proc_simd_fp (insn_decode_record *aarch64_insn_r) if (!(opcode >> 1) || ((opcode >> 1) == 0x02 && !rmode)) { if (record_debug) - fprintf_unfiltered (gdb_stdlog, "float to int conversion"); + debug_printf ("float to int conversion"); record_buf[0] = reg_rd + AARCH64_X0_REGNUM; } @@ -3701,7 +3641,7 @@ aarch64_record_data_proc_simd_fp (insn_decode_record *aarch64_insn_r) else if ((opcode >> 1) == 0x01 && !rmode) { if (record_debug) - fprintf_unfiltered (gdb_stdlog, "int to float conversion"); + debug_printf ("int to float conversion"); record_buf[0] = reg_rd + AARCH64_V0_REGNUM; } @@ -3709,7 +3649,7 @@ aarch64_record_data_proc_simd_fp (insn_decode_record *aarch64_insn_r) else if ((opcode >> 1) == 0x03) { if (record_debug) - fprintf_unfiltered (gdb_stdlog, "move float to int"); + debug_printf ("move float to int"); if (!(opcode & 0x01)) record_buf[0] = reg_rd + AARCH64_X0_REGNUM; @@ -3728,7 +3668,7 @@ aarch64_record_data_proc_simd_fp (insn_decode_record *aarch64_insn_r) else if ((insn_bits28_31 & 0x09) == 0x00 && insn_bits24_27 == 0x0e) { if (record_debug) - fprintf_unfiltered (gdb_stdlog, "SIMD copy"); + debug_printf ("SIMD copy"); /* Advanced SIMD copy instructions. */ if (!bits (aarch64_insn_r->aarch64_insn, 21, 23) @@ -3747,13 +3687,13 @@ aarch64_record_data_proc_simd_fp (insn_decode_record *aarch64_insn_r) else { if (record_debug) - fprintf_unfiltered (gdb_stdlog, "all remain"); + debug_printf ("all remain"); record_buf[0] = reg_rd + AARCH64_V0_REGNUM; } if (record_debug) - fprintf_unfiltered (gdb_stdlog, "\n"); + debug_printf ("\n"); aarch64_insn_r->reg_rec_count++; gdb_assert (aarch64_insn_r->reg_rec_count == 1); @@ -3817,7 +3757,6 @@ aarch64_process_record (struct gdbarch *gdbarch, struct regcache *regcache, uint32_t rec_no = 0; uint8_t insn_size = 4; uint32_t ret = 0; - ULONGEST t_bit = 0, insn_id = 0; gdb_byte buf[insn_size]; insn_decode_record aarch64_record;