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Diffstat (limited to 'gdb/aarch64-tdep.c')
| -rw-r--r-- | gdb/aarch64-tdep.c | 2739 |
1 files changed, 2739 insertions, 0 deletions
diff --git a/gdb/aarch64-tdep.c b/gdb/aarch64-tdep.c new file mode 100644 index 0000000..ac4ed17 --- /dev/null +++ b/gdb/aarch64-tdep.c @@ -0,0 +1,2739 @@ +/* Common target dependent code for GDB on AArch64 systems. + + Copyright (C) 2009-2013 Free Software Foundation, Inc. + Contributed by ARM Ltd. + + 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 "inferior.h" +#include "gdbcmd.h" +#include "gdbcore.h" +#include "gdb_string.h" +#include "dis-asm.h" +#include "regcache.h" +#include "reggroups.h" +#include "doublest.h" +#include "value.h" +#include "arch-utils.h" +#include "osabi.h" +#include "frame-unwind.h" +#include "frame-base.h" +#include "trad-frame.h" +#include "objfiles.h" +#include "dwarf2-frame.h" +#include "gdbtypes.h" +#include "prologue-value.h" +#include "target-descriptions.h" +#include "user-regs.h" +#include "language.h" +#include "infcall.h" + +#include "aarch64-tdep.h" + +#include "elf-bfd.h" +#include "elf/aarch64.h" + +#include "gdb_assert.h" +#include "vec.h" + +#include "features/aarch64.c" +#include "features/aarch64-without-fpu.c" + +/* Pseudo register base numbers. */ +#define AARCH64_Q0_REGNUM 0 +#define AARCH64_D0_REGNUM (AARCH64_Q0_REGNUM + 32) +#define AARCH64_S0_REGNUM (AARCH64_D0_REGNUM + 32) +#define AARCH64_H0_REGNUM (AARCH64_S0_REGNUM + 32) +#define AARCH64_B0_REGNUM (AARCH64_H0_REGNUM + 32) + +/* The standard register names, and all the valid aliases for them. */ +static const struct +{ + const char *const name; + int regnum; +} aarch64_register_aliases[] = +{ + /* 64-bit register names. */ + {"fp", AARCH64_FP_REGNUM}, + {"lr", AARCH64_LR_REGNUM}, + {"sp", AARCH64_SP_REGNUM}, + + /* 32-bit register names. */ + {"w0", AARCH64_X0_REGNUM + 0}, + {"w1", AARCH64_X0_REGNUM + 1}, + {"w2", AARCH64_X0_REGNUM + 2}, + {"w3", AARCH64_X0_REGNUM + 3}, + {"w4", AARCH64_X0_REGNUM + 4}, + {"w5", AARCH64_X0_REGNUM + 5}, + {"w6", AARCH64_X0_REGNUM + 6}, + {"w7", AARCH64_X0_REGNUM + 7}, + {"w8", AARCH64_X0_REGNUM + 8}, + {"w9", AARCH64_X0_REGNUM + 9}, + {"w10", AARCH64_X0_REGNUM + 10}, + {"w11", AARCH64_X0_REGNUM + 11}, + {"w12", AARCH64_X0_REGNUM + 12}, + {"w13", AARCH64_X0_REGNUM + 13}, + {"w14", AARCH64_X0_REGNUM + 14}, + {"w15", AARCH64_X0_REGNUM + 15}, + {"w16", AARCH64_X0_REGNUM + 16}, + {"w17", AARCH64_X0_REGNUM + 17}, + {"w18", AARCH64_X0_REGNUM + 18}, + {"w19", AARCH64_X0_REGNUM + 19}, + {"w20", AARCH64_X0_REGNUM + 20}, + {"w21", AARCH64_X0_REGNUM + 21}, + {"w22", AARCH64_X0_REGNUM + 22}, + {"w23", AARCH64_X0_REGNUM + 23}, + {"w24", AARCH64_X0_REGNUM + 24}, + {"w25", AARCH64_X0_REGNUM + 25}, + {"w26", AARCH64_X0_REGNUM + 26}, + {"w27", AARCH64_X0_REGNUM + 27}, + {"w28", AARCH64_X0_REGNUM + 28}, + {"w29", AARCH64_X0_REGNUM + 29}, + {"w30", AARCH64_X0_REGNUM + 30}, + + /* specials */ + {"ip0", AARCH64_X0_REGNUM + 16}, + {"ip1", AARCH64_X0_REGNUM + 17} +}; + +/* The required core 'R' registers. */ +static const char *const aarch64_r_register_names[] = +{ + /* These registers must appear in consecutive RAW register number + order and they must begin with AARCH64_X0_REGNUM! */ + "x0", "x1", "x2", "x3", + "x4", "x5", "x6", "x7", + "x8", "x9", "x10", "x11", + "x12", "x13", "x14", "x15", + "x16", "x17", "x18", "x19", + "x20", "x21", "x22", "x23", + "x24", "x25", "x26", "x27", + "x28", "x29", "x30", "sp", + "pc", "cpsr" +}; + +/* The FP/SIMD 'V' registers. */ +static const char *const aarch64_v_register_names[] = +{ + /* These registers must appear in consecutive RAW register number + order and they must begin with AARCH64_V0_REGNUM! */ + "v0", "v1", "v2", "v3", + "v4", "v5", "v6", "v7", + "v8", "v9", "v10", "v11", + "v12", "v13", "v14", "v15", + "v16", "v17", "v18", "v19", + "v20", "v21", "v22", "v23", + "v24", "v25", "v26", "v27", + "v28", "v29", "v30", "v31", + "fpsr", + "fpcr" +}; + +/* AArch64 prologue cache structure. */ +struct aarch64_prologue_cache +{ + /* The stack pointer at the time this frame was created; i.e. the + caller's stack pointer when this function was called. It is used + to identify this frame. */ + CORE_ADDR prev_sp; + + /* The frame base for this frame is just prev_sp - frame size. + FRAMESIZE is the distance from the frame pointer to the + initial stack pointer. */ + int framesize; + + /* The register used to hold the frame pointer for this frame. */ + int framereg; + + /* Saved register offsets. */ + 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) +{ + 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. */ + +static CORE_ADDR +aarch64_analyze_prologue (struct gdbarch *gdbarch, + CORE_ADDR start, CORE_ADDR limit, + struct aarch64_prologue_cache *cache) +{ + enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); + int i; + pv_t regs[AARCH64_X_REGISTER_COUNT]; + struct pv_area *stack; + struct cleanup *back_to; + + for (i = 0; i < AARCH64_X_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); + + 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; + unsigned is64; + unsigned is_link; + unsigned op; + unsigned bit; + int32_t offset; + + 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)) + { + /* Stop analysis on branch. */ + break; + } + else if (decode_bcond (start, insn, &cond, &offset)) + { + /* Stop analysis on branch. */ + break; + } + else if (decode_br (start, insn, &is_link, &rn)) + { + /* Stop analysis on branch. */ + break; + } + else if (decode_cb (start, insn, &is64, &op, &rn, &offset)) + { + /* Stop analysis on branch. */ + break; + } + else if (decode_eret (start, insn)) + { + /* 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)) + { + if (imm == 0 && rn == 31) + 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); + break; + } + } + else if (decode_ret (start, insn, &rn)) + { + /* Stop analysis on branch. */ + break; + } + else if (decode_stur (start, insn, &is64, &rt, &rn, &offset)) + { + pv_area_store (stack, pv_add_constant (regs[rn], offset), + is64 ? 8 : 4, regs[rt]); + } + else if (decode_stp_offset (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; + + 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)) || + pv_area_store_would_trash (stack, + pv_add_constant (regs[rn], imm + 8))) + break; + + 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)) + { + /* Stop analysis on branch. */ + break; + } + 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); + break; + } + } + + if (cache == NULL) + { + do_cleanups (back_to); + return start; + } + + if (pv_is_register (regs[AARCH64_FP_REGNUM], AARCH64_SP_REGNUM)) + { + /* Frame pointer is fp. Frame size is constant. */ + cache->framereg = AARCH64_FP_REGNUM; + cache->framesize = -regs[AARCH64_FP_REGNUM].k; + } + else if (pv_is_register (regs[AARCH64_SP_REGNUM], AARCH64_SP_REGNUM)) + { + /* Try the stack pointer. */ + cache->framesize = -regs[AARCH64_SP_REGNUM].k; + cache->framereg = AARCH64_SP_REGNUM; + } + else + { + /* We're just out of luck. We don't know where the frame is. */ + cache->framereg = -1; + cache->framesize = 0; + } + + for (i = 0; i < AARCH64_X_REGISTER_COUNT; i++) + { + CORE_ADDR offset; + + if (pv_area_find_reg (stack, gdbarch, i, &offset)) + cache->saved_regs[i].addr = offset; + } + + do_cleanups (back_to); + return start; +} + +/* Implement the "skip_prologue" gdbarch method. */ + +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 + prologue, whichever is greater. */ + if (find_pc_partial_function (pc, NULL, &func_addr, NULL)) + { + CORE_ADDR post_prologue_pc + = skip_prologue_using_sal (gdbarch, func_addr); + + if (post_prologue_pc != 0) + return max (pc, post_prologue_pc); + } + + /* Can't determine prologue from the symbol table, need to examine + instructions. */ + + /* Find an upper limit on the function prologue using the debug + information. If the debug information could not be used to + provide that bound, then use an arbitrary large number as the + upper bound. */ + limit_pc = skip_prologue_using_sal (gdbarch, pc); + if (limit_pc == 0) + limit_pc = pc + 128; /* Magic. */ + + /* Try disassembling prologue. */ + return aarch64_analyze_prologue (gdbarch, pc, limit_pc, NULL); +} + +/* Scan the function prologue for THIS_FRAME and populate the prologue + cache CACHE. */ + +static void +aarch64_scan_prologue (struct frame_info *this_frame, + struct aarch64_prologue_cache *cache) +{ + CORE_ADDR block_addr = get_frame_address_in_block (this_frame); + CORE_ADDR prologue_start; + CORE_ADDR prologue_end; + CORE_ADDR prev_pc = get_frame_pc (this_frame); + struct gdbarch *gdbarch = get_frame_arch (this_frame); + + /* Assume we do not find a frame. */ + cache->framereg = -1; + cache->framesize = 0; + + if (find_pc_partial_function (block_addr, NULL, &prologue_start, + &prologue_end)) + { + struct symtab_and_line sal = find_pc_line (prologue_start, 0); + + if (sal.line == 0) + { + /* No line info so use the current PC. */ + prologue_end = prev_pc; + } + else if (sal.end < prologue_end) + { + /* The next line begins after the function end. */ + prologue_end = sal.end; + } + + prologue_end = 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) + return; + + cache->framereg = AARCH64_FP_REGNUM; + cache->framesize = 16; + cache->saved_regs[29].addr = 0; + cache->saved_regs[30].addr = 8; + } +} + +/* Allocate an aarch64_prologue_cache and fill it with information + about the prologue of *THIS_FRAME. */ + +static struct aarch64_prologue_cache * +aarch64_make_prologue_cache (struct frame_info *this_frame) +{ + struct aarch64_prologue_cache *cache; + CORE_ADDR unwound_fp; + int reg; + + cache = FRAME_OBSTACK_ZALLOC (struct aarch64_prologue_cache); + cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); + + aarch64_scan_prologue (this_frame, cache); + + if (cache->framereg == -1) + return cache; + + unwound_fp = get_frame_register_unsigned (this_frame, cache->framereg); + if (unwound_fp == 0) + return cache; + + cache->prev_sp = unwound_fp + cache->framesize; + + /* Calculate actual addresses of saved registers using offsets + determined by aarch64_analyze_prologue. */ + for (reg = 0; reg < gdbarch_num_regs (get_frame_arch (this_frame)); reg++) + if (trad_frame_addr_p (cache->saved_regs, reg)) + cache->saved_regs[reg].addr += cache->prev_sp; + + return cache; +} + +/* Our frame ID for a normal frame is the current function's starting + PC and the caller's SP when we were called. */ + +static void +aarch64_prologue_this_id (struct frame_info *this_frame, + void **this_cache, struct frame_id *this_id) +{ + struct aarch64_prologue_cache *cache; + struct frame_id id; + CORE_ADDR pc, func; + + if (*this_cache == NULL) + *this_cache = aarch64_make_prologue_cache (this_frame); + cache = *this_cache; + + /* This is meant to halt the backtrace at "_start". */ + pc = get_frame_pc (this_frame); + if (pc <= gdbarch_tdep (get_frame_arch (this_frame))->lowest_pc) + return; + + /* If we've hit a wall, stop. */ + if (cache->prev_sp == 0) + return; + + func = get_frame_func (this_frame); + id = frame_id_build (cache->prev_sp, func); + *this_id = id; +} + +/* Implement the "prev_register" frame_unwind method. */ + +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; + + if (*this_cache == NULL) + *this_cache = aarch64_make_prologue_cache (this_frame); + cache = *this_cache; + + /* If we are asked to unwind the PC, then we need to return the LR + instead. The prologue may save PC, but it will point into this + frame's prologue, not the next frame's resume location. */ + if (prev_regnum == AARCH64_PC_REGNUM) + { + CORE_ADDR lr; + + lr = frame_unwind_register_unsigned (this_frame, AARCH64_LR_REGNUM); + return frame_unwind_got_constant (this_frame, prev_regnum, lr); + } + + /* SP is generally not saved to the stack, but this frame is + identified by the next frame's stack pointer at the time of the + call. The value was already reconstructed into PREV_SP. */ + /* + +----------+ ^ + | saved lr | | + +->| saved fp |--+ + | | | + | | | <- Previous SP + | +----------+ + | | saved lr | + +--| saved fp |<- FP + | | + | |<- SP + +----------+ */ + if (prev_regnum == AARCH64_SP_REGNUM) + return frame_unwind_got_constant (this_frame, prev_regnum, + cache->prev_sp); + + return trad_frame_get_prev_register (this_frame, cache->saved_regs, + prev_regnum); +} + +/* AArch64 prologue unwinder. */ +struct frame_unwind aarch64_prologue_unwind = +{ + NORMAL_FRAME, + default_frame_unwind_stop_reason, + aarch64_prologue_this_id, + aarch64_prologue_prev_register, + NULL, + default_frame_sniffer +}; + +/* Allocate an aarch64_prologue_cache and fill it with information + about the prologue of *THIS_FRAME. */ + +static struct aarch64_prologue_cache * +aarch64_make_stub_cache (struct frame_info *this_frame) +{ + int reg; + struct aarch64_prologue_cache *cache; + CORE_ADDR unwound_fp; + + cache = FRAME_OBSTACK_ZALLOC (struct aarch64_prologue_cache); + cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); + + cache->prev_sp + = get_frame_register_unsigned (this_frame, AARCH64_SP_REGNUM); + + return cache; +} + +/* Our frame ID for a stub frame is the current SP and LR. */ + +static void +aarch64_stub_this_id (struct frame_info *this_frame, + void **this_cache, struct frame_id *this_id) +{ + struct aarch64_prologue_cache *cache; + + if (*this_cache == NULL) + *this_cache = aarch64_make_stub_cache (this_frame); + cache = *this_cache; + + *this_id = frame_id_build (cache->prev_sp, get_frame_pc (this_frame)); +} + +/* Implement the "sniffer" frame_unwind method. */ + +static int +aarch64_stub_unwind_sniffer (const struct frame_unwind *self, + struct frame_info *this_frame, + void **this_prologue_cache) +{ + CORE_ADDR addr_in_block; + gdb_byte dummy[4]; + + addr_in_block = get_frame_address_in_block (this_frame); + if (in_plt_section (addr_in_block, NULL) + /* We also use the stub winder if the target memory is unreadable + to avoid having the prologue unwinder trying to read it. */ + || target_read_memory (get_frame_pc (this_frame), dummy, 4) != 0) + return 1; + + return 0; +} + +/* AArch64 stub unwinder. */ +struct frame_unwind aarch64_stub_unwind = +{ + NORMAL_FRAME, + default_frame_unwind_stop_reason, + aarch64_stub_this_id, + aarch64_prologue_prev_register, + NULL, + aarch64_stub_unwind_sniffer +}; + +/* Return the frame base address of *THIS_FRAME. */ + +static CORE_ADDR +aarch64_normal_frame_base (struct frame_info *this_frame, void **this_cache) +{ + struct aarch64_prologue_cache *cache; + + if (*this_cache == NULL) + *this_cache = aarch64_make_prologue_cache (this_frame); + cache = *this_cache; + + return cache->prev_sp - cache->framesize; +} + +/* AArch64 default frame base information. */ +struct frame_base aarch64_normal_base = +{ + &aarch64_prologue_unwind, + aarch64_normal_frame_base, + aarch64_normal_frame_base, + aarch64_normal_frame_base +}; + +/* Assuming THIS_FRAME is a dummy, return the frame ID of that + dummy frame. The frame ID's base needs to match the TOS value + saved by save_dummy_frame_tos () and returned from + aarch64_push_dummy_call, and the PC needs to match the dummy + frame's breakpoint. */ + +static struct frame_id +aarch64_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) +{ + return frame_id_build (get_frame_register_unsigned (this_frame, + AARCH64_SP_REGNUM), + get_frame_pc (this_frame)); +} + +/* Implement the "unwind_pc" gdbarch method. */ + +static CORE_ADDR +aarch64_unwind_pc (struct gdbarch *gdbarch, struct frame_info *this_frame) +{ + CORE_ADDR pc + = frame_unwind_register_unsigned (this_frame, AARCH64_PC_REGNUM); + + return pc; +} + +/* Implement the "unwind_sp" gdbarch method. */ + +static CORE_ADDR +aarch64_unwind_sp (struct gdbarch *gdbarch, struct frame_info *this_frame) +{ + return frame_unwind_register_unsigned (this_frame, AARCH64_SP_REGNUM); +} + +/* Return the value of the REGNUM register in the previous frame of + *THIS_FRAME. */ + +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) + { + case AARCH64_PC_REGNUM: + lr = frame_unwind_register_unsigned (this_frame, AARCH64_LR_REGNUM); + return frame_unwind_got_constant (this_frame, regnum, lr); + + default: + internal_error (__FILE__, __LINE__, + _("Unexpected register %d"), regnum); + } +} + +/* Implement the "init_reg" dwarf2_frame_ops method. */ + +static void +aarch64_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum, + struct dwarf2_frame_state_reg *reg, + struct frame_info *this_frame) +{ + switch (regnum) + { + case AARCH64_PC_REGNUM: + reg->how = DWARF2_FRAME_REG_FN; + reg->loc.fn = aarch64_dwarf2_prev_register; + break; + case AARCH64_SP_REGNUM: + reg->how = DWARF2_FRAME_REG_CFA; + break; + } +} + +/* When arguments must be pushed onto the stack, they go on in reverse + order. The code below implements a FILO (stack) to do this. */ + +typedef struct +{ + /* Value to pass on stack. */ + const void *data; + + /* Size in bytes of value to pass on stack. */ + int len; +} stack_item_t; + +DEF_VEC_O (stack_item_t); + +/* Return the alignment (in bytes) of the given type. */ + +static int +aarch64_type_align (struct type *t) +{ + int n; + int align; + int falign; + + t = check_typedef (t); + switch (TYPE_CODE (t)) + { + default: + /* Should never happen. */ + internal_error (__FILE__, __LINE__, _("unknown type alignment")); + return 4; + + case TYPE_CODE_PTR: + case TYPE_CODE_ENUM: + case TYPE_CODE_INT: + case TYPE_CODE_FLT: + case TYPE_CODE_SET: + case TYPE_CODE_RANGE: + case TYPE_CODE_BITSTRING: + case TYPE_CODE_REF: + case TYPE_CODE_CHAR: + case TYPE_CODE_BOOL: + return TYPE_LENGTH (t); + + case TYPE_CODE_ARRAY: + case TYPE_CODE_COMPLEX: + return aarch64_type_align (TYPE_TARGET_TYPE (t)); + + case TYPE_CODE_STRUCT: + case TYPE_CODE_UNION: + align = 1; + for (n = 0; n < TYPE_NFIELDS (t); n++) + { + falign = aarch64_type_align (TYPE_FIELD_TYPE (t, n)); + if (falign > align) + align = falign; + } + return align; + } +} + +/* Return 1 if *TY is a homogeneous floating-point aggregate as + defined in the AAPCS64 ABI document; otherwise return 0. */ + +static int +is_hfa (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) + return 1; + break; + } + + case TYPE_CODE_UNION: + case TYPE_CODE_STRUCT: + { + 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) + { + int i; + + for (i = 0; i < TYPE_NFIELDS (ty); i++) + { + struct type *member1_type; + + member1_type = check_typedef (TYPE_FIELD_TYPE (ty, i)); + if (TYPE_CODE (member0_type) != TYPE_CODE (member1_type) + || (TYPE_LENGTH (member0_type) + != TYPE_LENGTH (member1_type))) + return 0; + } + return 1; + } + } + return 0; + } + + default: + break; + } + + return 0; +} + +/* AArch64 function call information structure. */ +struct aarch64_call_info +{ + /* the current argument number. */ + unsigned argnum; + + /* The next general purpose register number, equivalent to NGRN as + described in the AArch64 Procedure Call Standard. */ + unsigned ngrn; + + /* The next SIMD and floating point register number, equivalent to + NSRN as described in the AArch64 Procedure Call Standard. */ + unsigned nsrn; + + /* The next stacked argument address, equivalent to NSAA as + described in the AArch64 Procedure Call Standard. */ + unsigned nsaa; + + /* Stack item vector. */ + VEC(stack_item_t) *si; +}; + +/* Pass a value in a sequence of consecutive X registers. The caller + is responsbile for ensuring sufficient registers are available. */ + +static void +pass_in_x (struct gdbarch *gdbarch, struct regcache *regcache, + struct aarch64_call_info *info, struct type *type, + const bfd_byte *buf) +{ + 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; + + info->argnum++; + + while (len > 0) + { + int partial_len = len < X_REGISTER_SIZE ? len : X_REGISTER_SIZE; + CORE_ADDR regval = extract_unsigned_integer (buf, partial_len, + byte_order); + + + /* Adjust sub-word struct/union args when big-endian. */ + if (byte_order == BFD_ENDIAN_BIG + && partial_len < X_REGISTER_SIZE + && (typecode == TYPE_CODE_STRUCT || typecode == TYPE_CODE_UNION)) + 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)); + regcache_cooked_write_unsigned (regcache, regnum, regval); + len -= partial_len; + buf += partial_len; + regnum++; + } +} + +/* Attempt to marshall a value in a V register. Return 1 if + successful, or 0 if insufficient registers are available. This + function, unlike the equivalent pass_in_x() function does not + handle arguments spread across multiple registers. */ + +static int +pass_in_v (struct gdbarch *gdbarch, + struct regcache *regcache, + struct aarch64_call_info *info, + const bfd_byte *buf) +{ + if (info->nsrn < 8) + { + enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); + int regnum = AARCH64_V0_REGNUM + info->nsrn; + + info->argnum++; + info->nsrn++; + + regcache_cooked_write (regcache, regnum, buf); + if (aarch64_debug) + fprintf_unfiltered (gdb_stdlog, "arg %d in %s\n", + info->argnum, + gdbarch_register_name (gdbarch, regnum)); + return 1; + } + info->nsrn = 8; + return 0; +} + +/* Marshall an argument onto the stack. */ + +static void +pass_on_stack (struct aarch64_call_info *info, struct type *type, + const bfd_byte *buf) +{ + int len = TYPE_LENGTH (type); + int align; + stack_item_t item; + + info->argnum++; + + align = aarch64_type_align (type); + + /* PCS C.17 Stack should be aligned to the larger of 8 bytes or the + Natural alignment of the argument's type. */ + align = align_up (align, 8); + + /* The AArch64 PCS requires at most doubleword alignment. */ + if (align > 16) + align = 16; + + if (aarch64_debug) + fprintf_unfiltered (gdb_stdlog, "arg %d len=%d @ sp + %d\n", + info->argnum, len, info->nsaa); + + item.len = len; + item.data = buf; + VEC_safe_push (stack_item_t, info->si, &item); + + info->nsaa += len; + if (info->nsaa & (align - 1)) + { + /* Push stack alignment padding. */ + int pad = align - (info->nsaa & (align - 1)); + + item.len = pad; + item.data = buf; + + VEC_safe_push (stack_item_t, info->si, &item); + info->nsaa += pad; + } +} + +/* Marshall an argument into a sequence of one or more consecutive X + registers or, if insufficient X registers are available then onto + the stack. */ + +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) +{ + int len = TYPE_LENGTH (type); + int nregs = (len + X_REGISTER_SIZE - 1) / X_REGISTER_SIZE; + + /* PCS C.13 - Pass in registers if we have enough spare */ + if (info->ngrn + nregs <= 8) + { + pass_in_x (gdbarch, regcache, info, type, buf); + info->ngrn += nregs; + } + else + { + info->ngrn = 8; + pass_on_stack (info, type, buf); + } +} + +/* Pass a value in a V register, or on the stack if insufficient are + available. */ + +static void +pass_in_v_or_stack (struct gdbarch *gdbarch, + struct regcache *regcache, + struct aarch64_call_info *info, + struct type *type, + const bfd_byte *buf) +{ + if (!pass_in_v (gdbarch, regcache, info, buf)) + pass_on_stack (info, type, buf); +} + +/* Implement the "push_dummy_call" gdbarch method. */ + +static CORE_ADDR +aarch64_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) +{ + int nstack = 0; + int argnum; + int x_argreg; + int v_argreg; + struct aarch64_call_info info; + struct type *func_type; + struct type *return_type; + int lang_struct_return; + + memset (&info, 0, sizeof (info)); + + /* We need to know what the type of the called function is in order + to determine the number of named/anonymous arguments for the + actual argument placement, and the return type in order to handle + return value correctly. + + The generic code above us views the decision of return in memory + or return in registers as a two stage processes. The language + handler is consulted first and may decide to return in memory (eg + class with copy constructor returned by value), this will cause + the generic code to allocate space AND insert an initial leading + argument. + + If the language code does not decide to pass in memory then the + target code is consulted. + + If the language code decides to pass in memory we want to move + the pointer inserted as the initial argument from the argument + list and into X8, the conventional AArch64 struct return pointer + register. + + This is slightly awkward, ideally the flag "lang_struct_return" + would be passed to the targets implementation of push_dummy_call. + Rather that change the target interface we call the language code + directly ourselves. */ + + func_type = check_typedef (value_type (function)); + + /* Dereference function pointer types. */ + if (TYPE_CODE (func_type) == TYPE_CODE_PTR) + func_type = TYPE_TARGET_TYPE (func_type); + + gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC + || TYPE_CODE (func_type) == TYPE_CODE_METHOD); + + /* If language_pass_by_reference () returned true we will have been + given an additional initial argument, a hidden pointer to the + return slot in memory. */ + return_type = TYPE_TARGET_TYPE (func_type); + lang_struct_return = language_pass_by_reference (return_type); + + /* Set the return address. For the AArch64, the return breakpoint + is always at BP_ADDR. */ + regcache_cooked_write_unsigned (regcache, AARCH64_LR_REGNUM, bp_addr); + + /* If we were given an initial argument for the return slot because + lang_struct_return was true, lose it. */ + if (lang_struct_return) + { + args++; + nargs--; + } + + /* The struct_return pointer occupies X8. */ + 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)); + regcache_cooked_write_unsigned (regcache, AARCH64_STRUCT_RETURN_REGNUM, + struct_addr); + } + + for (argnum = 0; argnum < nargs; argnum++) + { + struct value *arg = args[argnum]; + struct type *arg_type; + int len; + + arg_type = check_typedef (value_type (arg)); + len = TYPE_LENGTH (arg_type); + + switch (TYPE_CODE (arg_type)) + { + case TYPE_CODE_INT: + case TYPE_CODE_BOOL: + case TYPE_CODE_CHAR: + case TYPE_CODE_RANGE: + case TYPE_CODE_ENUM: + if (len < 4) + { + /* Promote to 32 bit integer. */ + if (TYPE_UNSIGNED (arg_type)) + arg_type = builtin_type (gdbarch)->builtin_uint32; + else + 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)); + break; + + case TYPE_CODE_COMPLEX: + if (info.nsrn <= 6) + { + const bfd_byte *buf = value_contents (arg); + struct type *target_type = + check_typedef (TYPE_TARGET_TYPE (arg_type)); + + pass_in_v (gdbarch, regcache, &info, buf); + pass_in_v (gdbarch, regcache, &info, + buf + TYPE_LENGTH (target_type)); + } + else + { + info.nsrn = 8; + pass_on_stack (&info, arg_type, value_contents (arg)); + } + break; + case TYPE_CODE_FLT: + pass_in_v_or_stack (gdbarch, regcache, &info, arg_type, + value_contents (arg)); + break; + + case TYPE_CODE_STRUCT: + case TYPE_CODE_ARRAY: + case TYPE_CODE_UNION: + if (is_hfa (arg_type)) + { + int elements = TYPE_NFIELDS (arg_type); + + /* Homogeneous Aggregates */ + if (info.nsrn + elements < 8) + { + int i; + + for (i = 0; i < elements; i++) + { + /* We know that we have sufficient registers + available therefore this will never fallback + to the stack. */ + struct value *field = + value_primitive_field (arg, 0, i, arg_type); + struct type *field_type = + check_typedef (value_type (field)); + + pass_in_v_or_stack (gdbarch, regcache, &info, field_type, + value_contents_writeable (field)); + } + } + else + { + info.nsrn = 8; + pass_on_stack (&info, arg_type, value_contents (arg)); + } + } + else if (len > 16) + { + /* PCS B.7 Aggregates larger than 16 bytes are passed by + invisible reference. */ + + /* Allocate aligned storage. */ + sp = align_down (sp - len, 16); + + /* Write the real data into the stack. */ + write_memory (sp, value_contents (arg), len); + + /* 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)); + } + else + /* PCS C.15 / C.18 multiple values pass. */ + pass_in_x_or_stack (gdbarch, regcache, &info, arg_type, + value_contents (arg)); + break; + + default: + pass_in_x_or_stack (gdbarch, regcache, &info, arg_type, + value_contents (arg)); + break; + } + } + + /* Make sure stack retains 16 byte alignment. */ + if (info.nsaa & 15) + sp -= 16 - (info.nsaa & 15); + + while (!VEC_empty (stack_item_t, info.si)) + { + stack_item_t *si = VEC_last (stack_item_t, info.si); + + sp -= si->len; + write_memory (sp, si->data, si->len); + VEC_pop (stack_item_t, info.si); + } + + VEC_free (stack_item_t, info.si); + + /* Finally, update the SP register. */ + regcache_cooked_write_unsigned (regcache, AARCH64_SP_REGNUM, sp); + + return sp; +} + +/* Implement the "frame_align" gdbarch method. */ + +static CORE_ADDR +aarch64_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) +{ + /* Align the stack to sixteen bytes. */ + return sp & ~(CORE_ADDR) 15; +} + +/* Return the type for an AdvSISD Q register. */ + +static struct type * +aarch64_vnq_type (struct gdbarch *gdbarch) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + + if (tdep->vnq_type == NULL) + { + struct type *t; + struct type *elem; + + t = arch_composite_type (gdbarch, "__gdb_builtin_type_vnq", + TYPE_CODE_UNION); + + elem = builtin_type (gdbarch)->builtin_uint128; + append_composite_type_field (t, "u", elem); + + elem = builtin_type (gdbarch)->builtin_int128; + append_composite_type_field (t, "s", elem); + + tdep->vnq_type = t; + } + + return tdep->vnq_type; +} + +/* Return the type for an AdvSISD D register. */ + +static struct type * +aarch64_vnd_type (struct gdbarch *gdbarch) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + + if (tdep->vnd_type == NULL) + { + struct type *t; + struct type *elem; + + t = arch_composite_type (gdbarch, "__gdb_builtin_type_vnd", + TYPE_CODE_UNION); + + elem = builtin_type (gdbarch)->builtin_double; + append_composite_type_field (t, "f", elem); + + elem = builtin_type (gdbarch)->builtin_uint64; + append_composite_type_field (t, "u", elem); + + elem = builtin_type (gdbarch)->builtin_int64; + append_composite_type_field (t, "s", elem); + + tdep->vnd_type = t; + } + + return tdep->vnd_type; +} + +/* Return the type for an AdvSISD S register. */ + +static struct type * +aarch64_vns_type (struct gdbarch *gdbarch) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + + if (tdep->vns_type == NULL) + { + struct type *t; + struct type *elem; + + t = arch_composite_type (gdbarch, "__gdb_builtin_type_vns", + TYPE_CODE_UNION); + + elem = builtin_type (gdbarch)->builtin_float; + append_composite_type_field (t, "f", elem); + + elem = builtin_type (gdbarch)->builtin_uint32; + append_composite_type_field (t, "u", elem); + + elem = builtin_type (gdbarch)->builtin_int32; + append_composite_type_field (t, "s", elem); + + tdep->vns_type = t; + } + + return tdep->vns_type; +} + +/* Return the type for an AdvSISD H register. */ + +static struct type * +aarch64_vnh_type (struct gdbarch *gdbarch) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + + if (tdep->vnh_type == NULL) + { + struct type *t; + struct type *elem; + + t = arch_composite_type (gdbarch, "__gdb_builtin_type_vnh", + TYPE_CODE_UNION); + + elem = builtin_type (gdbarch)->builtin_uint16; + append_composite_type_field (t, "u", elem); + + elem = builtin_type (gdbarch)->builtin_int16; + append_composite_type_field (t, "s", elem); + + tdep->vnh_type = t; + } + + return tdep->vnh_type; +} + +/* Return the type for an AdvSISD B register. */ + +static struct type * +aarch64_vnb_type (struct gdbarch *gdbarch) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + + if (tdep->vnb_type == NULL) + { + struct type *t; + struct type *elem; + + t = arch_composite_type (gdbarch, "__gdb_builtin_type_vnb", + TYPE_CODE_UNION); + + elem = builtin_type (gdbarch)->builtin_uint8; + append_composite_type_field (t, "u", elem); + + elem = builtin_type (gdbarch)->builtin_int8; + append_composite_type_field (t, "s", elem); + + tdep->vnb_type = t; + } + + return tdep->vnb_type; +} + +/* Implement the "dwarf2_reg_to_regnum" gdbarch method. */ + +static int +aarch64_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg) +{ + if (reg >= AARCH64_DWARF_X0 && reg <= AARCH64_DWARF_X0 + 30) + return AARCH64_X0_REGNUM + reg - AARCH64_DWARF_X0; + + if (reg == AARCH64_DWARF_SP) + return AARCH64_SP_REGNUM; + + if (reg >= AARCH64_DWARF_V0 && reg <= AARCH64_DWARF_V0 + 31) + return AARCH64_V0_REGNUM + reg - AARCH64_DWARF_V0; + + return -1; +} + + +/* Implement the "print_insn" gdbarch method. */ + +static int +aarch64_gdb_print_insn (bfd_vma memaddr, disassemble_info *info) +{ + info->symbols = NULL; + return print_insn_aarch64 (memaddr, info); +} + +/* AArch64 BRK software debug mode instruction. + Note that AArch64 code is always little-endian. + 1101.0100.0010.0000.0000.0000.0000.0000 = 0xd4200000. */ +static const char aarch64_default_breakpoint[] = {0x00, 0x00, 0x20, 0xd4}; + +/* Implement the "breakpoint_from_pc" gdbarch method. */ + +static const unsigned char * +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; +} + +/* Extract from an array REGS containing the (raw) register state a + function return value of type TYPE, and copy that, in virtual + format, into VALBUF. */ + +static void +aarch64_extract_return_value (struct type *type, struct regcache *regs, + gdb_byte *valbuf) +{ + struct gdbarch *gdbarch = get_regcache_arch (regs); + enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); + + if (TYPE_CODE (type) == TYPE_CODE_FLT) + { + bfd_byte buf[V_REGISTER_SIZE]; + int len = TYPE_LENGTH (type); + + regcache_cooked_read (regs, AARCH64_V0_REGNUM, buf); + memcpy (valbuf, buf, len); + } + else if (TYPE_CODE (type) == TYPE_CODE_INT + || TYPE_CODE (type) == TYPE_CODE_CHAR + || TYPE_CODE (type) == TYPE_CODE_BOOL + || TYPE_CODE (type) == TYPE_CODE_PTR + || TYPE_CODE (type) == TYPE_CODE_REF + || TYPE_CODE (type) == TYPE_CODE_ENUM) + { + /* If the the type is a plain integer, then the access is + straight-forward. Otherwise we have to play around a bit + more. */ + int len = TYPE_LENGTH (type); + int regno = AARCH64_X0_REGNUM; + ULONGEST tmp; + + while (len > 0) + { + /* By using store_unsigned_integer we avoid having to do + anything special for small big-endian values. */ + regcache_cooked_read_unsigned (regs, regno++, &tmp); + store_unsigned_integer (valbuf, + (len > X_REGISTER_SIZE + ? X_REGISTER_SIZE : len), byte_order, tmp); + len -= X_REGISTER_SIZE; + valbuf += X_REGISTER_SIZE; + } + } + else if (TYPE_CODE (type) == TYPE_CODE_COMPLEX) + { + int regno = AARCH64_V0_REGNUM; + bfd_byte buf[V_REGISTER_SIZE]; + struct type *target_type = check_typedef (TYPE_TARGET_TYPE (type)); + int len = TYPE_LENGTH (target_type); + + regcache_cooked_read (regs, regno, buf); + memcpy (valbuf, buf, len); + valbuf += len; + regcache_cooked_read (regs, regno + 1, buf); + memcpy (valbuf, buf, len); + valbuf += len; + } + else if (is_hfa (type)) + { + int elements = TYPE_NFIELDS (type); + struct type *member_type = check_typedef (TYPE_FIELD_TYPE (type, 0)); + int len = TYPE_LENGTH (member_type); + int i; + + for (i = 0; i < elements; i++) + { + int regno = AARCH64_V0_REGNUM + i; + bfd_byte buf[X_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)); + regcache_cooked_read (regs, regno, buf); + + memcpy (valbuf, buf, len); + valbuf += len; + } + } + else + { + /* For a structure or union the behaviour is as if the value had + been stored to word-aligned memory and then loaded into + registers with 64-bit load instruction(s). */ + int len = TYPE_LENGTH (type); + int regno = AARCH64_X0_REGNUM; + bfd_byte buf[X_REGISTER_SIZE]; + + while (len > 0) + { + regcache_cooked_read (regs, regno++, buf); + memcpy (valbuf, buf, len > X_REGISTER_SIZE ? X_REGISTER_SIZE : len); + len -= X_REGISTER_SIZE; + valbuf += X_REGISTER_SIZE; + } + } +} + + +/* Will a function return an aggregate type in memory or in a + register? Return 0 if an aggregate type can be returned in a + register, 1 if it must be returned in memory. */ + +static int +aarch64_return_in_memory (struct gdbarch *gdbarch, struct type *type) +{ + int nRc; + enum type_code code; + + 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)) + { + /* PCS B.5 If the argument is a Named HFA, then the argument is + used unmodified. */ + return 0; + } + + if (TYPE_LENGTH (type) > 16) + { + /* PCS B.6 Aggregates larger than 16 bytes are passed by + invisible reference. */ + + return 1; + } + + return 0; +} + +/* Write into appropriate registers a function return value of type + TYPE, given in virtual format. */ + +static void +aarch64_store_return_value (struct type *type, struct regcache *regs, + const gdb_byte *valbuf) +{ + struct gdbarch *gdbarch = get_regcache_arch (regs); + enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); + + if (TYPE_CODE (type) == TYPE_CODE_FLT) + { + bfd_byte buf[V_REGISTER_SIZE]; + int len = TYPE_LENGTH (type); + + memcpy (buf, valbuf, len > V_REGISTER_SIZE ? V_REGISTER_SIZE : len); + regcache_cooked_write (regs, AARCH64_V0_REGNUM, buf); + } + else if (TYPE_CODE (type) == TYPE_CODE_INT + || TYPE_CODE (type) == TYPE_CODE_CHAR + || TYPE_CODE (type) == TYPE_CODE_BOOL + || TYPE_CODE (type) == TYPE_CODE_PTR + || TYPE_CODE (type) == TYPE_CODE_REF + || TYPE_CODE (type) == TYPE_CODE_ENUM) + { + if (TYPE_LENGTH (type) <= X_REGISTER_SIZE) + { + /* Values of one word or less are zero/sign-extended and + returned in r0. */ + bfd_byte tmpbuf[X_REGISTER_SIZE]; + LONGEST val = unpack_long (type, valbuf); + + store_signed_integer (tmpbuf, X_REGISTER_SIZE, byte_order, val); + regcache_cooked_write (regs, AARCH64_X0_REGNUM, tmpbuf); + } + else + { + /* Integral values greater than one word are stored in + consecutive registers starting with r0. This will always + be a multiple of the regiser size. */ + int len = TYPE_LENGTH (type); + int regno = AARCH64_X0_REGNUM; + + while (len > 0) + { + regcache_cooked_write (regs, regno++, valbuf); + len -= X_REGISTER_SIZE; + valbuf += X_REGISTER_SIZE; + } + } + } + else if (is_hfa (type)) + { + int elements = TYPE_NFIELDS (type); + struct type *member_type = check_typedef (TYPE_FIELD_TYPE (type, 0)); + int len = TYPE_LENGTH (member_type); + int i; + + for (i = 0; i < elements; i++) + { + int regno = AARCH64_V0_REGNUM + i; + 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)); + + memcpy (tmpbuf, valbuf, len); + regcache_cooked_write (regs, regno, tmpbuf); + valbuf += len; + } + } + else + { + /* For a structure or union the behaviour is as if the value had + been stored to word-aligned memory and then loaded into + registers with 64-bit load instruction(s). */ + int len = TYPE_LENGTH (type); + int regno = AARCH64_X0_REGNUM; + bfd_byte tmpbuf[X_REGISTER_SIZE]; + + while (len > 0) + { + memcpy (tmpbuf, valbuf, + len > X_REGISTER_SIZE ? X_REGISTER_SIZE : len); + regcache_cooked_write (regs, regno++, tmpbuf); + len -= X_REGISTER_SIZE; + valbuf += X_REGISTER_SIZE; + } + } +} + +/* Implement the "return_value" gdbarch method. */ + +static enum return_value_convention +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 + || TYPE_CODE (valtype) == TYPE_CODE_ARRAY) + { + if (aarch64_return_in_memory (gdbarch, valtype)) + { + if (aarch64_debug) + fprintf_unfiltered (gdb_stdlog, "return value in memory\n"); + return RETURN_VALUE_STRUCT_CONVENTION; + } + } + + if (writebuf) + aarch64_store_return_value (valtype, regcache, writebuf); + + if (readbuf) + aarch64_extract_return_value (valtype, regcache, readbuf); + + if (aarch64_debug) + fprintf_unfiltered (gdb_stdlog, "return value in registers\n"); + + return RETURN_VALUE_REGISTER_CONVENTION; +} + +/* Implement the "get_longjmp_target" gdbarch method. */ + +static int +aarch64_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) +{ + CORE_ADDR jb_addr; + gdb_byte buf[X_REGISTER_SIZE]; + struct gdbarch *gdbarch = get_frame_arch (frame); + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); + + jb_addr = get_frame_register_unsigned (frame, AARCH64_X0_REGNUM); + + if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf, + X_REGISTER_SIZE)) + return 0; + + *pc = extract_unsigned_integer (buf, X_REGISTER_SIZE, byte_order); + return 1; +} + + +/* Return the pseudo register name corresponding to register regnum. */ + +static const char * +aarch64_pseudo_register_name (struct gdbarch *gdbarch, int regnum) +{ + static const char *const q_name[] = + { + "q0", "q1", "q2", "q3", + "q4", "q5", "q6", "q7", + "q8", "q9", "q10", "q11", + "q12", "q13", "q14", "q15", + "q16", "q17", "q18", "q19", + "q20", "q21", "q22", "q23", + "q24", "q25", "q26", "q27", + "q28", "q29", "q30", "q31", + }; + + static const char *const d_name[] = + { + "d0", "d1", "d2", "d3", + "d4", "d5", "d6", "d7", + "d8", "d9", "d10", "d11", + "d12", "d13", "d14", "d15", + "d16", "d17", "d18", "d19", + "d20", "d21", "d22", "d23", + "d24", "d25", "d26", "d27", + "d28", "d29", "d30", "d31", + }; + + static const char *const s_name[] = + { + "s0", "s1", "s2", "s3", + "s4", "s5", "s6", "s7", + "s8", "s9", "s10", "s11", + "s12", "s13", "s14", "s15", + "s16", "s17", "s18", "s19", + "s20", "s21", "s22", "s23", + "s24", "s25", "s26", "s27", + "s28", "s29", "s30", "s31", + }; + + static const char *const h_name[] = + { + "h0", "h1", "h2", "h3", + "h4", "h5", "h6", "h7", + "h8", "h9", "h10", "h11", + "h12", "h13", "h14", "h15", + "h16", "h17", "h18", "h19", + "h20", "h21", "h22", "h23", + "h24", "h25", "h26", "h27", + "h28", "h29", "h30", "h31", + }; + + static const char *const b_name[] = + { + "b0", "b1", "b2", "b3", + "b4", "b5", "b6", "b7", + "b8", "b9", "b10", "b11", + "b12", "b13", "b14", "b15", + "b16", "b17", "b18", "b19", + "b20", "b21", "b22", "b23", + "b24", "b25", "b26", "b27", + "b28", "b29", "b30", "b31", + }; + + regnum -= gdbarch_num_regs (gdbarch); + + if (regnum >= AARCH64_Q0_REGNUM && regnum < AARCH64_Q0_REGNUM + 32) + return q_name[regnum - AARCH64_Q0_REGNUM]; + + if (regnum >= AARCH64_D0_REGNUM && regnum < AARCH64_D0_REGNUM + 32) + return d_name[regnum - AARCH64_D0_REGNUM]; + + if (regnum >= AARCH64_S0_REGNUM && regnum < AARCH64_S0_REGNUM + 32) + return s_name[regnum - AARCH64_S0_REGNUM]; + + if (regnum >= AARCH64_H0_REGNUM && regnum < AARCH64_H0_REGNUM + 32) + return h_name[regnum - AARCH64_H0_REGNUM]; + + if (regnum >= AARCH64_B0_REGNUM && regnum < AARCH64_B0_REGNUM + 32) + return b_name[regnum - AARCH64_B0_REGNUM]; + + internal_error (__FILE__, __LINE__, + _("aarch64_pseudo_register_name: bad register number %d"), + regnum); +} + +/* Implement the "pseudo_register_type" tdesc_arch_data method. */ + +static struct type * +aarch64_pseudo_register_type (struct gdbarch *gdbarch, int regnum) +{ + regnum -= gdbarch_num_regs (gdbarch); + + if (regnum >= AARCH64_Q0_REGNUM && regnum < AARCH64_Q0_REGNUM + 32) + return aarch64_vnq_type (gdbarch); + + if (regnum >= AARCH64_D0_REGNUM && regnum < AARCH64_D0_REGNUM + 32) + return aarch64_vnd_type (gdbarch); + + if (regnum >= AARCH64_S0_REGNUM && regnum < AARCH64_S0_REGNUM + 32) + return aarch64_vns_type (gdbarch); + + if (regnum >= AARCH64_H0_REGNUM && regnum < AARCH64_H0_REGNUM + 32) + return aarch64_vnh_type (gdbarch); + + if (regnum >= AARCH64_B0_REGNUM && regnum < AARCH64_B0_REGNUM + 32) + return aarch64_vnb_type (gdbarch); + + internal_error (__FILE__, __LINE__, + _("aarch64_pseudo_register_type: bad register number %d"), + regnum); +} + +/* Implement the "pseudo_register_reggroup_p" tdesc_arch_data method. */ + +static int +aarch64_pseudo_register_reggroup_p (struct gdbarch *gdbarch, int regnum, + struct reggroup *group) +{ + regnum -= gdbarch_num_regs (gdbarch); + + if (regnum >= AARCH64_Q0_REGNUM && regnum < AARCH64_Q0_REGNUM + 32) + return group == all_reggroup || group == vector_reggroup; + else if (regnum >= AARCH64_D0_REGNUM && regnum < AARCH64_D0_REGNUM + 32) + return (group == all_reggroup || group == vector_reggroup + || group == float_reggroup); + else if (regnum >= AARCH64_S0_REGNUM && regnum < AARCH64_S0_REGNUM + 32) + return (group == all_reggroup || group == vector_reggroup + || group == float_reggroup); + else if (regnum >= AARCH64_H0_REGNUM && regnum < AARCH64_H0_REGNUM + 32) + return group == all_reggroup || group == vector_reggroup; + else if (regnum >= AARCH64_B0_REGNUM && regnum < AARCH64_B0_REGNUM + 32) + return group == all_reggroup || group == vector_reggroup; + + return group == all_reggroup; +} + +/* Implement the "pseudo_register_read_value" gdbarch method. */ + +static struct value * +aarch64_pseudo_read_value (struct gdbarch *gdbarch, + struct regcache *regcache, + int regnum) +{ + gdb_byte reg_buf[MAX_REGISTER_SIZE]; + struct value *result_value; + gdb_byte *buf; + + result_value = allocate_value (register_type (gdbarch, regnum)); + VALUE_LVAL (result_value) = lval_register; + VALUE_REGNUM (result_value) = regnum; + buf = value_contents_raw (result_value); + + regnum -= gdbarch_num_regs (gdbarch); + + if (regnum >= AARCH64_Q0_REGNUM && regnum < AARCH64_Q0_REGNUM + 32) + { + enum register_status status; + unsigned v_regnum; + + v_regnum = AARCH64_V0_REGNUM + regnum - AARCH64_Q0_REGNUM; + status = regcache_raw_read (regcache, v_regnum, reg_buf); + if (status != REG_VALID) + mark_value_bytes_unavailable (result_value, 0, + TYPE_LENGTH (value_type (result_value))); + else + memcpy (buf, reg_buf, Q_REGISTER_SIZE); + return result_value; + } + + if (regnum >= AARCH64_D0_REGNUM && regnum < AARCH64_D0_REGNUM + 32) + { + enum register_status status; + unsigned v_regnum; + + v_regnum = AARCH64_V0_REGNUM + regnum - AARCH64_D0_REGNUM; + status = regcache_raw_read (regcache, v_regnum, reg_buf); + if (status != REG_VALID) + mark_value_bytes_unavailable (result_value, 0, + TYPE_LENGTH (value_type (result_value))); + else + memcpy (buf, reg_buf, D_REGISTER_SIZE); + return result_value; + } + + if (regnum >= AARCH64_S0_REGNUM && regnum < AARCH64_S0_REGNUM + 32) + { + enum register_status status; + unsigned v_regnum; + + 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); + return result_value; + } + + if (regnum >= AARCH64_H0_REGNUM && regnum < AARCH64_H0_REGNUM + 32) + { + enum register_status status; + unsigned v_regnum; + + v_regnum = AARCH64_V0_REGNUM + regnum - AARCH64_H0_REGNUM; + status = regcache_raw_read (regcache, v_regnum, reg_buf); + if (status != REG_VALID) + mark_value_bytes_unavailable (result_value, 0, + TYPE_LENGTH (value_type (result_value))); + else + memcpy (buf, reg_buf, H_REGISTER_SIZE); + return result_value; + } + + if (regnum >= AARCH64_B0_REGNUM && regnum < AARCH64_B0_REGNUM + 32) + { + enum register_status status; + unsigned v_regnum; + + v_regnum = AARCH64_V0_REGNUM + regnum - AARCH64_B0_REGNUM; + status = regcache_raw_read (regcache, v_regnum, reg_buf); + if (status != REG_VALID) + mark_value_bytes_unavailable (result_value, 0, + TYPE_LENGTH (value_type (result_value))); + else + memcpy (buf, reg_buf, B_REGISTER_SIZE); + return result_value; + } + + gdb_assert_not_reached ("regnum out of bound"); +} + +/* Implement the "pseudo_register_write" gdbarch method. */ + +static void +aarch64_pseudo_write (struct gdbarch *gdbarch, struct regcache *regcache, + int regnum, const gdb_byte *buf) +{ + gdb_byte reg_buf[MAX_REGISTER_SIZE]; + + /* Ensure the register buffer is zero, we want gdb writes of the + various 'scalar' pseudo registers to behavior like architectural + writes, register width bytes are written the remainder are set to + zero. */ + memset (reg_buf, 0, sizeof (reg_buf)); + + regnum -= gdbarch_num_regs (gdbarch); + + if (regnum >= AARCH64_Q0_REGNUM && regnum < AARCH64_Q0_REGNUM + 32) + { + /* pseudo Q registers */ + unsigned v_regnum; + + v_regnum = AARCH64_V0_REGNUM + regnum - AARCH64_Q0_REGNUM; + memcpy (reg_buf, buf, Q_REGISTER_SIZE); + regcache_raw_write (regcache, v_regnum, reg_buf); + return; + } + + if (regnum >= AARCH64_D0_REGNUM && regnum < AARCH64_D0_REGNUM + 32) + { + /* pseudo D registers */ + unsigned v_regnum; + + v_regnum = AARCH64_V0_REGNUM + regnum - AARCH64_D0_REGNUM; + memcpy (reg_buf, buf, D_REGISTER_SIZE); + regcache_raw_write (regcache, v_regnum, reg_buf); + return; + } + + if (regnum >= AARCH64_S0_REGNUM && regnum < AARCH64_S0_REGNUM + 32) + { + unsigned v_regnum; + + v_regnum = AARCH64_V0_REGNUM + regnum - AARCH64_S0_REGNUM; + memcpy (reg_buf, buf, S_REGISTER_SIZE); + regcache_raw_write (regcache, v_regnum, reg_buf); + return; + } + + if (regnum >= AARCH64_H0_REGNUM && regnum < AARCH64_H0_REGNUM + 32) + { + /* pseudo H registers */ + unsigned v_regnum; + + v_regnum = AARCH64_V0_REGNUM + regnum - AARCH64_H0_REGNUM; + memcpy (reg_buf, buf, H_REGISTER_SIZE); + regcache_raw_write (regcache, v_regnum, reg_buf); + return; + } + + if (regnum >= AARCH64_B0_REGNUM && regnum < AARCH64_B0_REGNUM + 32) + { + /* pseudo B registers */ + unsigned v_regnum; + + v_regnum = AARCH64_V0_REGNUM + regnum - AARCH64_B0_REGNUM; + memcpy (reg_buf, buf, B_REGISTER_SIZE); + regcache_raw_write (regcache, v_regnum, reg_buf); + return; + } + + gdb_assert_not_reached ("regnum out of bound"); +} + +/* Implement the "write_pc" gdbarch method. */ + +static void +aarch64_write_pc (struct regcache *regcache, CORE_ADDR pc) +{ + regcache_cooked_write_unsigned (regcache, AARCH64_PC_REGNUM, pc); +} + +/* Callback function for user_reg_add. */ + +static struct value * +value_of_aarch64_user_reg (struct frame_info *frame, const void *baton) +{ + const int *reg_p = baton; + + return value_of_register (*reg_p, frame); +} + + +/* 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. + + Called e.g. at program startup, when reading a core file, and when + reading a binary file. */ + +static struct gdbarch * +aarch64_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) +{ + struct gdbarch_tdep *tdep; + struct gdbarch *gdbarch; + struct gdbarch_list *best_arch; + 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; + int num_pseudo_regs = 0; + + /* Ensure we always have a target descriptor. */ + if (!tdesc_has_registers (tdesc)) + tdesc = tdesc_aarch64; + + gdb_assert (tdesc); + + feature = tdesc_find_feature (tdesc, "org.gnu.gdb.aarch64.core"); + + if (feature == NULL) + return NULL; + + tdesc_data = tdesc_data_alloc (); + + /* Validate the descriptor provides the mandatory core R registers + and allocate their numbers. */ + for (i = 0; i < ARRAY_SIZE (aarch64_r_register_names); i++) + valid_p &= + tdesc_numbered_register (feature, tdesc_data, AARCH64_X0_REGNUM + i, + aarch64_r_register_names[i]); + + num_regs = AARCH64_X0_REGNUM + i; + + /* Look for the V registers. */ + feature = tdesc_find_feature (tdesc, "org.gnu.gdb.aarch64.fpu"); + if (feature) + { + /* Validate the descriptor provides the mandatory V registers + and allocate their numbers. */ + for (i = 0; i < ARRAY_SIZE (aarch64_v_register_names); i++) + valid_p &= + tdesc_numbered_register (feature, tdesc_data, AARCH64_V0_REGNUM + i, + aarch64_v_register_names[i]); + + num_regs = AARCH64_V0_REGNUM + i; + + num_pseudo_regs += 32; /* add the Qn scalar register pseudos */ + num_pseudo_regs += 32; /* add the Dn scalar register pseudos */ + num_pseudo_regs += 32; /* add the Sn scalar register pseudos */ + num_pseudo_regs += 32; /* add the Hn scalar register pseudos */ + num_pseudo_regs += 32; /* add the Bn scalar register pseudos */ + } + + if (!valid_p) + { + tdesc_data_cleanup (tdesc_data); + return NULL; + } + + /* AArch64 code is always little-endian. */ + info.byte_order_for_code = BFD_ENDIAN_LITTLE; + + /* If there is already a candidate, use it. */ + for (best_arch = gdbarch_list_lookup_by_info (arches, &info); + best_arch != NULL; + best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info)) + { + /* Found a match. */ + break; + } + + if (best_arch != NULL) + { + if (tdesc_data != NULL) + tdesc_data_cleanup (tdesc_data); + return best_arch->gdbarch; + } + + tdep = xcalloc (1, sizeof (struct gdbarch_tdep)); + gdbarch = gdbarch_alloc (&info, tdep); + + /* This should be low enough for everything. */ + tdep->lowest_pc = 0x20; + tdep->jb_pc = -1; /* Longjump support not enabled by default. */ + tdep->jb_elt_size = 8; + + set_gdbarch_push_dummy_call (gdbarch, aarch64_push_dummy_call); + set_gdbarch_frame_align (gdbarch, aarch64_frame_align); + + set_gdbarch_write_pc (gdbarch, aarch64_write_pc); + + /* Frame handling. */ + set_gdbarch_dummy_id (gdbarch, aarch64_dummy_id); + set_gdbarch_unwind_pc (gdbarch, aarch64_unwind_pc); + set_gdbarch_unwind_sp (gdbarch, aarch64_unwind_sp); + + /* Advance PC across function entry code. */ + set_gdbarch_skip_prologue (gdbarch, aarch64_skip_prologue); + + /* The stack grows downward. */ + set_gdbarch_inner_than (gdbarch, core_addr_lessthan); + + /* Breakpoint manipulation. */ + set_gdbarch_breakpoint_from_pc (gdbarch, aarch64_breakpoint_from_pc); + set_gdbarch_cannot_step_breakpoint (gdbarch, 1); + set_gdbarch_have_nonsteppable_watchpoint (gdbarch, 1); + + /* Information about registers, etc. */ + set_gdbarch_sp_regnum (gdbarch, AARCH64_SP_REGNUM); + set_gdbarch_pc_regnum (gdbarch, AARCH64_PC_REGNUM); + set_gdbarch_num_regs (gdbarch, num_regs); + + set_gdbarch_num_pseudo_regs (gdbarch, num_pseudo_regs); + set_gdbarch_pseudo_register_read_value (gdbarch, aarch64_pseudo_read_value); + set_gdbarch_pseudo_register_write (gdbarch, aarch64_pseudo_write); + set_tdesc_pseudo_register_name (gdbarch, aarch64_pseudo_register_name); + set_tdesc_pseudo_register_type (gdbarch, aarch64_pseudo_register_type); + set_tdesc_pseudo_register_reggroup_p (gdbarch, + aarch64_pseudo_register_reggroup_p); + + /* ABI */ + set_gdbarch_short_bit (gdbarch, 16); + set_gdbarch_int_bit (gdbarch, 32); + set_gdbarch_float_bit (gdbarch, 32); + set_gdbarch_double_bit (gdbarch, 64); + set_gdbarch_long_double_bit (gdbarch, 128); + set_gdbarch_long_bit (gdbarch, 64); + set_gdbarch_long_long_bit (gdbarch, 64); + set_gdbarch_ptr_bit (gdbarch, 64); + set_gdbarch_char_signed (gdbarch, 0); + set_gdbarch_float_format (gdbarch, floatformats_ieee_single); + set_gdbarch_double_format (gdbarch, floatformats_ieee_double); + set_gdbarch_long_double_format (gdbarch, floatformats_ia64_quad); + + /* Internal <-> external register number maps. */ + set_gdbarch_dwarf2_reg_to_regnum (gdbarch, aarch64_dwarf_reg_to_regnum); + + /* Returning results. */ + set_gdbarch_return_value (gdbarch, aarch64_return_value); + + /* Disassembly. */ + set_gdbarch_print_insn (gdbarch, aarch64_gdb_print_insn); + + /* Virtual tables. */ + set_gdbarch_vbit_in_delta (gdbarch, 1); + + /* Hook in the ABI-specific overrides, if they have been registered. */ + info.target_desc = tdesc; + info.tdep_info = (void *) tdesc_data; + gdbarch_init_osabi (info, gdbarch); + + dwarf2_frame_set_init_reg (gdbarch, aarch64_dwarf2_frame_init_reg); + + /* Add some default predicates. */ + frame_unwind_append_unwinder (gdbarch, &aarch64_stub_unwind); + dwarf2_append_unwinders (gdbarch); + frame_unwind_append_unwinder (gdbarch, &aarch64_prologue_unwind); + + frame_base_set_default (gdbarch, &aarch64_normal_base); + + /* Now we have tuned the configuration, set a few final things, + based on what the OS ABI has told us. */ + + if (tdep->jb_pc >= 0) + set_gdbarch_get_longjmp_target (gdbarch, aarch64_get_longjmp_target); + + tdesc_use_registers (gdbarch, tdesc, tdesc_data); + + /* Add standard register aliases. */ + for (i = 0; i < ARRAY_SIZE (aarch64_register_aliases); i++) + user_reg_add (gdbarch, aarch64_register_aliases[i].name, + value_of_aarch64_user_reg, + &aarch64_register_aliases[i].regnum); + + return gdbarch; +} + +static void +aarch64_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + + if (tdep == NULL) + return; + + fprintf_unfiltered (file, _("aarch64_dump_tdep: Lowest pc = 0x%s"), + paddress (gdbarch, tdep->lowest_pc)); +} + +/* Suppress warning from -Wmissing-prototypes. */ +extern initialize_file_ftype _initialize_aarch64_tdep; + +void +_initialize_aarch64_tdep (void) +{ + gdbarch_register (bfd_arch_aarch64, aarch64_gdbarch_init, + aarch64_dump_tdep); + + initialize_tdesc_aarch64 (); + initialize_tdesc_aarch64_without_fpu (); + + /* Debug this file's internals. */ + add_setshow_boolean_cmd ("aarch64", class_maintenance, &aarch64_debug, _("\ +Set AArch64 debugging."), _("\ +Show AArch64 debugging."), _("\ +When on, AArch64 specific debugging is enabled."), + NULL, + show_aarch64_debug, + &setdebuglist, &showdebuglist); +} |