| /* Target dependent code for the Motorola 68000 series. |
| |
| Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1999, 2000, |
| 2001, 2002, 2003, 2004 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 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, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include "defs.h" |
| #include "dwarf2-frame.h" |
| #include "frame.h" |
| #include "frame-base.h" |
| #include "frame-unwind.h" |
| #include "symtab.h" |
| #include "gdbcore.h" |
| #include "value.h" |
| #include "gdb_string.h" |
| #include "gdb_assert.h" |
| #include "inferior.h" |
| #include "regcache.h" |
| #include "arch-utils.h" |
| #include "osabi.h" |
| #include "dis-asm.h" |
| |
| #include "m68k-tdep.h" |
| |
| |
| #define P_LINKL_FP 0x480e |
| #define P_LINKW_FP 0x4e56 |
| #define P_PEA_FP 0x4856 |
| #define P_MOVEAL_SP_FP 0x2c4f |
| #define P_ADDAW_SP 0xdefc |
| #define P_ADDAL_SP 0xdffc |
| #define P_SUBQW_SP 0x514f |
| #define P_SUBQL_SP 0x518f |
| #define P_LEA_SP_SP 0x4fef |
| #define P_LEA_PC_A5 0x4bfb0170 |
| #define P_FMOVEMX_SP 0xf227 |
| #define P_MOVEL_SP 0x2f00 |
| #define P_MOVEML_SP 0x48e7 |
| |
| |
| #define REGISTER_BYTES_FP (16*4 + 8 + 8*12 + 3*4) |
| #define REGISTER_BYTES_NOFP (16*4 + 8) |
| |
| /* Offset from SP to first arg on stack at first instruction of a function */ |
| #define SP_ARG0 (1 * 4) |
| |
| #if !defined (BPT_VECTOR) |
| #define BPT_VECTOR 0xf |
| #endif |
| |
| #if !defined (REMOTE_BPT_VECTOR) |
| #define REMOTE_BPT_VECTOR 1 |
| #endif |
| |
| |
| static const unsigned char * |
| m68k_local_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) |
| { |
| static unsigned char break_insn[] = {0x4e, (0x40 | BPT_VECTOR)}; |
| *lenptr = sizeof (break_insn); |
| return break_insn; |
| } |
| |
| |
| static int |
| m68k_register_bytes_ok (long numbytes) |
| { |
| return ((numbytes == REGISTER_BYTES_FP) |
| || (numbytes == REGISTER_BYTES_NOFP)); |
| } |
| |
| /* Return the GDB type object for the "standard" data type of data in |
| register N. This should be int for D0-D7, SR, FPCONTROL and |
| FPSTATUS, long double for FP0-FP7, and void pointer for all others |
| (A0-A7, PC, FPIADDR). Note, for registers which contain |
| addresses return pointer to void, not pointer to char, because we |
| don't want to attempt to print the string after printing the |
| address. */ |
| |
| static struct type * |
| m68k_register_type (struct gdbarch *gdbarch, int regnum) |
| { |
| if (regnum >= FP0_REGNUM && regnum <= FP0_REGNUM + 7) |
| return builtin_type_m68881_ext; |
| |
| if (regnum == M68K_FPI_REGNUM || regnum == PC_REGNUM) |
| return builtin_type_void_func_ptr; |
| |
| if (regnum == M68K_FPC_REGNUM || regnum == M68K_FPS_REGNUM |
| || regnum == PS_REGNUM) |
| return builtin_type_int32; |
| |
| if (regnum >= M68K_A0_REGNUM && regnum <= M68K_A0_REGNUM + 7) |
| return builtin_type_void_data_ptr; |
| |
| return builtin_type_int32; |
| } |
| |
| /* Function: m68k_register_name |
| Returns the name of the standard m68k register regnum. */ |
| |
| static const char * |
| m68k_register_name (int regnum) |
| { |
| static char *register_names[] = { |
| "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", |
| "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", |
| "ps", "pc", |
| "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", |
| "fpcontrol", "fpstatus", "fpiaddr", "fpcode", "fpflags" |
| }; |
| |
| if (regnum < 0 || |
| regnum >= sizeof (register_names) / sizeof (register_names[0])) |
| internal_error (__FILE__, __LINE__, |
| "m68k_register_name: illegal register number %d", regnum); |
| else |
| return register_names[regnum]; |
| } |
| |
| /* Extract from an array REGBUF containing the (raw) register state, a |
| function return value of TYPE, and copy that, in virtual format, |
| into VALBUF. */ |
| |
| static void |
| m68k_extract_return_value (struct type *type, struct regcache *regcache, |
| void *valbuf) |
| { |
| int len = TYPE_LENGTH (type); |
| char buf[M68K_MAX_REGISTER_SIZE]; |
| |
| if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
| && TYPE_NFIELDS (type) == 1) |
| { |
| m68k_extract_return_value (TYPE_FIELD_TYPE (type, 0), regcache, valbuf); |
| return; |
| } |
| |
| if (len <= 4) |
| { |
| regcache_raw_read (regcache, M68K_D0_REGNUM, buf); |
| memcpy (valbuf, buf + (4 - len), len); |
| } |
| else if (len <= 8) |
| { |
| regcache_raw_read (regcache, M68K_D0_REGNUM, buf); |
| memcpy (valbuf, buf + (8 - len), len - 4); |
| regcache_raw_read (regcache, M68K_D1_REGNUM, |
| (char *) valbuf + (len - 4)); |
| } |
| else |
| internal_error (__FILE__, __LINE__, |
| "Cannot extract return value of %d bytes long.", len); |
| } |
| |
| /* Write into the appropriate registers a function return value stored |
| in VALBUF of type TYPE, given in virtual format. */ |
| |
| static void |
| m68k_store_return_value (struct type *type, struct regcache *regcache, |
| const void *valbuf) |
| { |
| int len = TYPE_LENGTH (type); |
| |
| if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
| && TYPE_NFIELDS (type) == 1) |
| { |
| m68k_store_return_value (TYPE_FIELD_TYPE (type, 0), regcache, valbuf); |
| return; |
| } |
| |
| if (len <= 4) |
| regcache_raw_write_part (regcache, M68K_D0_REGNUM, 4 - len, len, valbuf); |
| else if (len <= 8) |
| { |
| regcache_raw_write_part (regcache, M68K_D1_REGNUM, 8 - len, |
| len - 4, valbuf); |
| regcache_raw_write (regcache, M68K_D0_REGNUM, |
| (char *) valbuf + (len - 4)); |
| } |
| else |
| internal_error (__FILE__, __LINE__, |
| "Cannot store return value of %d bytes long.", len); |
| } |
| |
| /* Extract from REGCACHE, which contains the (raw) register state, the |
| address in which a function should return its structure value, as a |
| CORE_ADDR. */ |
| |
| static CORE_ADDR |
| m68k_extract_struct_value_address (struct regcache *regcache) |
| { |
| char buf[4]; |
| |
| regcache_cooked_read (regcache, M68K_D0_REGNUM, buf); |
| return extract_unsigned_integer (buf, 4); |
| } |
| |
| static int |
| m68k_use_struct_convention (int gcc_p, struct type *type) |
| { |
| enum struct_return struct_return; |
| |
| struct_return = gdbarch_tdep (current_gdbarch)->struct_return; |
| return generic_use_struct_convention (struct_return == reg_struct_return, |
| type); |
| } |
| |
| /* A function that tells us whether the function invocation represented |
| by fi does not have a frame on the stack associated with it. If it |
| does not, FRAMELESS is set to 1, else 0. */ |
| |
| static int |
| m68k_frameless_function_invocation (struct frame_info *fi) |
| { |
| if (get_frame_type (fi) == SIGTRAMP_FRAME) |
| return 0; |
| else |
| return legacy_frameless_look_for_prologue (fi); |
| } |
| |
| int |
| delta68_in_sigtramp (CORE_ADDR pc, char *name) |
| { |
| if (name != NULL) |
| return strcmp (name, "_sigcode") == 0; |
| else |
| return 0; |
| } |
| |
| CORE_ADDR |
| delta68_frame_args_address (struct frame_info *frame_info) |
| { |
| /* we assume here that the only frameless functions are the system calls |
| or other functions who do not put anything on the stack. */ |
| if (get_frame_type (frame_info) == SIGTRAMP_FRAME) |
| return get_frame_base (frame_info) + 12; |
| else if (legacy_frameless_look_for_prologue (frame_info)) |
| { |
| /* Check for an interrupted system call */ |
| if (get_next_frame (frame_info) && (get_frame_type (get_next_frame (frame_info)) == SIGTRAMP_FRAME)) |
| return get_frame_base (get_next_frame (frame_info)) + 16; |
| else |
| return get_frame_base (frame_info) + 4; |
| } |
| else |
| return get_frame_base (frame_info); |
| } |
| |
| CORE_ADDR |
| delta68_frame_saved_pc (struct frame_info *frame_info) |
| { |
| return read_memory_unsigned_integer (delta68_frame_args_address (frame_info) |
| + 4, 4); |
| } |
| |
| int |
| delta68_frame_num_args (struct frame_info *fi) |
| { |
| int val; |
| CORE_ADDR pc = DEPRECATED_FRAME_SAVED_PC (fi); |
| int insn = read_memory_unsigned_integer (pc, 2); |
| val = 0; |
| if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ |
| val = read_memory_integer (pc + 2, 2); |
| else if ((insn & 0170777) == 0050217 /* addql #N, sp */ |
| || (insn & 0170777) == 0050117) /* addqw */ |
| { |
| val = (insn >> 9) & 7; |
| if (val == 0) |
| val = 8; |
| } |
| else if (insn == 0157774) /* addal #WW, sp */ |
| val = read_memory_integer (pc + 2, 4); |
| val >>= 2; |
| return val; |
| } |
| |
| static CORE_ADDR |
| m68k_push_dummy_call (struct gdbarch *gdbarch, CORE_ADDR func_addr, |
| struct regcache *regcache, CORE_ADDR bp_addr, int nargs, |
| struct value **args, CORE_ADDR sp, int struct_return, |
| CORE_ADDR struct_addr) |
| { |
| char buf[4]; |
| int i; |
| |
| /* Push arguments in reverse order. */ |
| for (i = nargs - 1; i >= 0; i--) |
| { |
| struct type *value_type = VALUE_ENCLOSING_TYPE (args[i]); |
| int len = TYPE_LENGTH (value_type); |
| int container_len = (len + 3) & ~3; |
| int offset; |
| |
| /* Non-scalars bigger than 4 bytes are left aligned, others are |
| right aligned. */ |
| if ((TYPE_CODE (value_type) == TYPE_CODE_STRUCT |
| || TYPE_CODE (value_type) == TYPE_CODE_UNION |
| || TYPE_CODE (value_type) == TYPE_CODE_ARRAY) |
| && len > 4) |
| offset = 0; |
| else |
| offset = container_len - len; |
| sp -= container_len; |
| write_memory (sp + offset, VALUE_CONTENTS_ALL (args[i]), len); |
| } |
| |
| /* Store struct value address. */ |
| if (struct_return) |
| { |
| store_unsigned_integer (buf, 4, struct_addr); |
| regcache_cooked_write (regcache, M68K_A1_REGNUM, buf); |
| } |
| |
| /* Store return address. */ |
| sp -= 4; |
| store_unsigned_integer (buf, 4, bp_addr); |
| write_memory (sp, buf, 4); |
| |
| /* Finally, update the stack pointer... */ |
| store_unsigned_integer (buf, 4, sp); |
| regcache_cooked_write (regcache, M68K_SP_REGNUM, buf); |
| |
| /* ...and fake a frame pointer. */ |
| regcache_cooked_write (regcache, M68K_FP_REGNUM, buf); |
| |
| /* DWARF2/GCC uses the stack address *before* the function call as a |
| frame's CFA. */ |
| return sp + 8; |
| } |
| |
| struct m68k_frame_cache |
| { |
| /* Base address. */ |
| CORE_ADDR base; |
| CORE_ADDR sp_offset; |
| CORE_ADDR pc; |
| |
| /* Saved registers. */ |
| CORE_ADDR saved_regs[M68K_NUM_REGS]; |
| CORE_ADDR saved_sp; |
| |
| /* Stack space reserved for local variables. */ |
| long locals; |
| }; |
| |
| /* Allocate and initialize a frame cache. */ |
| |
| static struct m68k_frame_cache * |
| m68k_alloc_frame_cache (void) |
| { |
| struct m68k_frame_cache *cache; |
| int i; |
| |
| cache = FRAME_OBSTACK_ZALLOC (struct m68k_frame_cache); |
| |
| /* Base address. */ |
| cache->base = 0; |
| cache->sp_offset = -4; |
| cache->pc = 0; |
| |
| /* Saved registers. We initialize these to -1 since zero is a valid |
| offset (that's where %fp is supposed to be stored). */ |
| for (i = 0; i < M68K_NUM_REGS; i++) |
| cache->saved_regs[i] = -1; |
| |
| /* Frameless until proven otherwise. */ |
| cache->locals = -1; |
| |
| return cache; |
| } |
| |
| /* Check whether PC points at a code that sets up a new stack frame. |
| If so, it updates CACHE and returns the address of the first |
| instruction after the sequence that sets removes the "hidden" |
| argument from the stack or CURRENT_PC, whichever is smaller. |
| Otherwise, return PC. */ |
| |
| static CORE_ADDR |
| m68k_analyze_frame_setup (CORE_ADDR pc, CORE_ADDR current_pc, |
| struct m68k_frame_cache *cache) |
| { |
| int op; |
| |
| if (pc >= current_pc) |
| return current_pc; |
| |
| op = read_memory_unsigned_integer (pc, 2); |
| |
| if (op == P_LINKW_FP || op == P_LINKL_FP || op == P_PEA_FP) |
| { |
| cache->saved_regs[M68K_FP_REGNUM] = 0; |
| cache->sp_offset += 4; |
| if (op == P_LINKW_FP) |
| { |
| /* link.w %fp, #-N */ |
| /* link.w %fp, #0; adda.l #-N, %sp */ |
| cache->locals = -read_memory_integer (pc + 2, 2); |
| |
| if (pc + 4 < current_pc && cache->locals == 0) |
| { |
| op = read_memory_unsigned_integer (pc + 4, 2); |
| if (op == P_ADDAL_SP) |
| { |
| cache->locals = read_memory_integer (pc + 6, 4); |
| return pc + 10; |
| } |
| } |
| |
| return pc + 4; |
| } |
| else if (op == P_LINKL_FP) |
| { |
| /* link.l %fp, #-N */ |
| cache->locals = -read_memory_integer (pc + 2, 4); |
| return pc + 6; |
| } |
| else |
| { |
| /* pea (%fp); movea.l %sp, %fp */ |
| cache->locals = 0; |
| |
| if (pc + 2 < current_pc) |
| { |
| op = read_memory_unsigned_integer (pc + 2, 2); |
| |
| if (op == P_MOVEAL_SP_FP) |
| { |
| /* move.l %sp, %fp */ |
| return pc + 4; |
| } |
| } |
| |
| return pc + 2; |
| } |
| } |
| else if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) |
| { |
| /* subq.[wl] #N,%sp */ |
| /* subq.[wl] #8,%sp; subq.[wl] #N,%sp */ |
| cache->locals = (op & 07000) == 0 ? 8 : (op & 07000) >> 9; |
| if (pc + 2 < current_pc) |
| { |
| op = read_memory_unsigned_integer (pc + 2, 2); |
| if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) |
| { |
| cache->locals += (op & 07000) == 0 ? 8 : (op & 07000) >> 9; |
| return pc + 4; |
| } |
| } |
| return pc + 2; |
| } |
| else if (op == P_ADDAW_SP || op == P_LEA_SP_SP) |
| { |
| /* adda.w #-N,%sp */ |
| /* lea (-N,%sp),%sp */ |
| cache->locals = -read_memory_integer (pc + 2, 2); |
| return pc + 4; |
| } |
| else if (op == P_ADDAL_SP) |
| { |
| /* adda.l #-N,%sp */ |
| cache->locals = -read_memory_integer (pc + 2, 4); |
| return pc + 6; |
| } |
| |
| return pc; |
| } |
| |
| /* Check whether PC points at code that saves registers on the stack. |
| If so, it updates CACHE and returns the address of the first |
| instruction after the register saves or CURRENT_PC, whichever is |
| smaller. Otherwise, return PC. */ |
| |
| static CORE_ADDR |
| m68k_analyze_register_saves (CORE_ADDR pc, CORE_ADDR current_pc, |
| struct m68k_frame_cache *cache) |
| { |
| if (cache->locals >= 0) |
| { |
| CORE_ADDR offset; |
| int op; |
| int i, mask, regno; |
| |
| offset = -4 - cache->locals; |
| while (pc < current_pc) |
| { |
| op = read_memory_unsigned_integer (pc, 2); |
| if (op == P_FMOVEMX_SP) |
| { |
| /* fmovem.x REGS,-(%sp) */ |
| op = read_memory_unsigned_integer (pc + 2, 2); |
| if ((op & 0xff00) == 0xe000) |
| { |
| mask = op & 0xff; |
| for (i = 0; i < 16; i++, mask >>= 1) |
| { |
| if (mask & 1) |
| { |
| cache->saved_regs[i + M68K_FP0_REGNUM] = offset; |
| offset -= 12; |
| } |
| } |
| pc += 4; |
| } |
| else |
| break; |
| } |
| else if ((op & 0170677) == P_MOVEL_SP) |
| { |
| /* move.l %R,-(%sp) */ |
| regno = ((op & 07000) >> 9) | ((op & 0100) >> 3); |
| cache->saved_regs[regno] = offset; |
| offset -= 4; |
| pc += 2; |
| } |
| else if (op == P_MOVEML_SP) |
| { |
| /* movem.l REGS,-(%sp) */ |
| mask = read_memory_unsigned_integer (pc + 2, 2); |
| for (i = 0; i < 16; i++, mask >>= 1) |
| { |
| if (mask & 1) |
| { |
| cache->saved_regs[15 - i] = offset; |
| offset -= 4; |
| } |
| } |
| pc += 4; |
| } |
| else |
| break; |
| } |
| } |
| |
| return pc; |
| } |
| |
| |
| /* Do a full analysis of the prologue at PC and update CACHE |
| accordingly. Bail out early if CURRENT_PC is reached. Return the |
| address where the analysis stopped. |
| |
| We handle all cases that can be generated by gcc. |
| |
| For allocating a stack frame: |
| |
| link.w %a6,#-N |
| link.l %a6,#-N |
| pea (%fp); move.l %sp,%fp |
| link.w %a6,#0; add.l #-N,%sp |
| subq.l #N,%sp |
| subq.w #N,%sp |
| subq.w #8,%sp; subq.w #N-8,%sp |
| add.w #-N,%sp |
| lea (-N,%sp),%sp |
| add.l #-N,%sp |
| |
| For saving registers: |
| |
| fmovem.x REGS,-(%sp) |
| move.l R1,-(%sp) |
| move.l R1,-(%sp); move.l R2,-(%sp) |
| movem.l REGS,-(%sp) |
| |
| For setting up the PIC register: |
| |
| lea (%pc,N),%a5 |
| |
| */ |
| |
| static CORE_ADDR |
| m68k_analyze_prologue (CORE_ADDR pc, CORE_ADDR current_pc, |
| struct m68k_frame_cache *cache) |
| { |
| unsigned int op; |
| |
| pc = m68k_analyze_frame_setup (pc, current_pc, cache); |
| pc = m68k_analyze_register_saves (pc, current_pc, cache); |
| if (pc >= current_pc) |
| return current_pc; |
| |
| /* Check for GOT setup. */ |
| op = read_memory_unsigned_integer (pc, 4); |
| if (op == P_LEA_PC_A5) |
| { |
| /* lea (%pc,N),%a5 */ |
| return pc + 6; |
| } |
| |
| return pc; |
| } |
| |
| /* Return PC of first real instruction. */ |
| |
| static CORE_ADDR |
| m68k_skip_prologue (CORE_ADDR start_pc) |
| { |
| struct m68k_frame_cache cache; |
| CORE_ADDR pc; |
| int op; |
| |
| cache.locals = -1; |
| pc = m68k_analyze_prologue (start_pc, (CORE_ADDR) -1, &cache); |
| if (cache.locals < 0) |
| return start_pc; |
| return pc; |
| } |
| |
| static CORE_ADDR |
| m68k_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) |
| { |
| char buf[8]; |
| |
| frame_unwind_register (next_frame, PC_REGNUM, buf); |
| return extract_typed_address (buf, builtin_type_void_func_ptr); |
| } |
| |
| /* Normal frames. */ |
| |
| static struct m68k_frame_cache * |
| m68k_frame_cache (struct frame_info *next_frame, void **this_cache) |
| { |
| struct m68k_frame_cache *cache; |
| char buf[4]; |
| int i; |
| |
| if (*this_cache) |
| return *this_cache; |
| |
| cache = m68k_alloc_frame_cache (); |
| *this_cache = cache; |
| |
| /* In principle, for normal frames, %fp holds the frame pointer, |
| which holds the base address for the current stack frame. |
| However, for functions that don't need it, the frame pointer is |
| optional. For these "frameless" functions the frame pointer is |
| actually the frame pointer of the calling frame. Signal |
| trampolines are just a special case of a "frameless" function. |
| They (usually) share their frame pointer with the frame that was |
| in progress when the signal occurred. */ |
| |
| frame_unwind_register (next_frame, M68K_FP_REGNUM, buf); |
| cache->base = extract_unsigned_integer (buf, 4); |
| if (cache->base == 0) |
| return cache; |
| |
| /* For normal frames, %pc is stored at 4(%fp). */ |
| cache->saved_regs[M68K_PC_REGNUM] = 4; |
| |
| cache->pc = frame_func_unwind (next_frame); |
| if (cache->pc != 0) |
| m68k_analyze_prologue (cache->pc, frame_pc_unwind (next_frame), cache); |
| |
| if (cache->locals < 0) |
| { |
| /* We didn't find a valid frame, which means that CACHE->base |
| currently holds the frame pointer for our calling frame. If |
| we're at the start of a function, or somewhere half-way its |
| prologue, the function's frame probably hasn't been fully |
| setup yet. Try to reconstruct the base address for the stack |
| frame by looking at the stack pointer. For truly "frameless" |
| functions this might work too. */ |
| |
| frame_unwind_register (next_frame, M68K_SP_REGNUM, buf); |
| cache->base = extract_unsigned_integer (buf, 4) + cache->sp_offset; |
| } |
| |
| /* Now that we have the base address for the stack frame we can |
| calculate the value of %sp in the calling frame. */ |
| cache->saved_sp = cache->base + 8; |
| |
| /* Adjust all the saved registers such that they contain addresses |
| instead of offsets. */ |
| for (i = 0; i < M68K_NUM_REGS; i++) |
| if (cache->saved_regs[i] != -1) |
| cache->saved_regs[i] += cache->base; |
| |
| return cache; |
| } |
| |
| static void |
| m68k_frame_this_id (struct frame_info *next_frame, void **this_cache, |
| struct frame_id *this_id) |
| { |
| struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); |
| |
| /* This marks the outermost frame. */ |
| if (cache->base == 0) |
| return; |
| |
| /* See the end of m68k_push_dummy_call. */ |
| *this_id = frame_id_build (cache->base + 8, cache->pc); |
| } |
| |
| static void |
| m68k_frame_prev_register (struct frame_info *next_frame, void **this_cache, |
| int regnum, int *optimizedp, |
| enum lval_type *lvalp, CORE_ADDR *addrp, |
| int *realnump, void *valuep) |
| { |
| struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); |
| |
| gdb_assert (regnum >= 0); |
| |
| if (regnum == M68K_SP_REGNUM && cache->saved_sp) |
| { |
| *optimizedp = 0; |
| *lvalp = not_lval; |
| *addrp = 0; |
| *realnump = -1; |
| if (valuep) |
| { |
| /* Store the value. */ |
| store_unsigned_integer (valuep, 4, cache->saved_sp); |
| } |
| return; |
| } |
| |
| if (regnum < M68K_NUM_REGS && cache->saved_regs[regnum] != -1) |
| { |
| *optimizedp = 0; |
| *lvalp = lval_memory; |
| *addrp = cache->saved_regs[regnum]; |
| *realnump = -1; |
| if (valuep) |
| { |
| /* Read the value in from memory. */ |
| read_memory (*addrp, valuep, |
| register_size (current_gdbarch, regnum)); |
| } |
| return; |
| } |
| |
| frame_register_unwind (next_frame, regnum, |
| optimizedp, lvalp, addrp, realnump, valuep); |
| } |
| |
| static const struct frame_unwind m68k_frame_unwind = |
| { |
| NORMAL_FRAME, |
| m68k_frame_this_id, |
| m68k_frame_prev_register |
| }; |
| |
| static const struct frame_unwind * |
| m68k_frame_sniffer (struct frame_info *next_frame) |
| { |
| return &m68k_frame_unwind; |
| } |
| |
| /* Signal trampolines. */ |
| |
| static struct m68k_frame_cache * |
| m68k_sigtramp_frame_cache (struct frame_info *next_frame, void **this_cache) |
| { |
| struct m68k_frame_cache *cache; |
| struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| struct m68k_sigtramp_info info; |
| char buf[4]; |
| int i; |
| |
| if (*this_cache) |
| return *this_cache; |
| |
| cache = m68k_alloc_frame_cache (); |
| |
| frame_unwind_register (next_frame, M68K_SP_REGNUM, buf); |
| cache->base = extract_unsigned_integer (buf, 4) - 4; |
| |
| info = tdep->get_sigtramp_info (next_frame); |
| |
| for (i = 0; i < M68K_NUM_REGS; i++) |
| if (info.sc_reg_offset[i] != -1) |
| cache->saved_regs[i] = info.sigcontext_addr + info.sc_reg_offset[i]; |
| |
| *this_cache = cache; |
| return cache; |
| } |
| |
| static void |
| m68k_sigtramp_frame_this_id (struct frame_info *next_frame, void **this_cache, |
| struct frame_id *this_id) |
| { |
| struct m68k_frame_cache *cache = |
| m68k_sigtramp_frame_cache (next_frame, this_cache); |
| |
| /* See the end of m68k_push_dummy_call. */ |
| *this_id = frame_id_build (cache->base + 8, frame_pc_unwind (next_frame)); |
| } |
| |
| static void |
| m68k_sigtramp_frame_prev_register (struct frame_info *next_frame, |
| void **this_cache, |
| int regnum, int *optimizedp, |
| enum lval_type *lvalp, CORE_ADDR *addrp, |
| int *realnump, void *valuep) |
| { |
| /* Make sure we've initialized the cache. */ |
| m68k_sigtramp_frame_cache (next_frame, this_cache); |
| |
| m68k_frame_prev_register (next_frame, this_cache, regnum, |
| optimizedp, lvalp, addrp, realnump, valuep); |
| } |
| |
| static const struct frame_unwind m68k_sigtramp_frame_unwind = |
| { |
| SIGTRAMP_FRAME, |
| m68k_sigtramp_frame_this_id, |
| m68k_sigtramp_frame_prev_register |
| }; |
| |
| static const struct frame_unwind * |
| m68k_sigtramp_frame_sniffer (struct frame_info *next_frame) |
| { |
| CORE_ADDR pc = frame_pc_unwind (next_frame); |
| char *name; |
| |
| /* We shouldn't even bother to try if the OSABI didn't register |
| a get_sigtramp_info handler. */ |
| if (!gdbarch_tdep (current_gdbarch)->get_sigtramp_info) |
| return NULL; |
| |
| find_pc_partial_function (pc, &name, NULL, NULL); |
| if (DEPRECATED_PC_IN_SIGTRAMP (pc, name)) |
| return &m68k_sigtramp_frame_unwind; |
| |
| return NULL; |
| } |
| |
| static CORE_ADDR |
| m68k_frame_base_address (struct frame_info *next_frame, void **this_cache) |
| { |
| struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); |
| |
| return cache->base; |
| } |
| |
| static const struct frame_base m68k_frame_base = |
| { |
| &m68k_frame_unwind, |
| m68k_frame_base_address, |
| m68k_frame_base_address, |
| m68k_frame_base_address |
| }; |
| |
| static struct frame_id |
| m68k_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame) |
| { |
| char buf[4]; |
| CORE_ADDR fp; |
| |
| frame_unwind_register (next_frame, M68K_FP_REGNUM, buf); |
| fp = extract_unsigned_integer (buf, 4); |
| |
| /* See the end of m68k_push_dummy_call. */ |
| return frame_id_build (fp + 8, frame_pc_unwind (next_frame)); |
| } |
| |
| #ifdef USE_PROC_FS /* Target dependent support for /proc */ |
| |
| #include <sys/procfs.h> |
| |
| /* Prototypes for supply_gregset etc. */ |
| #include "gregset.h" |
| |
| /* The /proc interface divides the target machine's register set up into |
| two different sets, the general register set (gregset) and the floating |
| point register set (fpregset). For each set, there is an ioctl to get |
| the current register set and another ioctl to set the current values. |
| |
| The actual structure passed through the ioctl interface is, of course, |
| naturally machine dependent, and is different for each set of registers. |
| For the m68k for example, the general register set is typically defined |
| by: |
| |
| typedef int gregset_t[18]; |
| |
| #define R_D0 0 |
| ... |
| #define R_PS 17 |
| |
| and the floating point set by: |
| |
| typedef struct fpregset { |
| int f_pcr; |
| int f_psr; |
| int f_fpiaddr; |
| int f_fpregs[8][3]; (8 regs, 96 bits each) |
| } fpregset_t; |
| |
| These routines provide the packing and unpacking of gregset_t and |
| fpregset_t formatted data. |
| |
| */ |
| |
| /* Atari SVR4 has R_SR but not R_PS */ |
| |
| #if !defined (R_PS) && defined (R_SR) |
| #define R_PS R_SR |
| #endif |
| |
| /* Given a pointer to a general register set in /proc format (gregset_t *), |
| unpack the register contents and supply them as gdb's idea of the current |
| register values. */ |
| |
| void |
| supply_gregset (gregset_t *gregsetp) |
| { |
| int regi; |
| greg_t *regp = (greg_t *) gregsetp; |
| |
| for (regi = 0; regi < R_PC; regi++) |
| { |
| supply_register (regi, (char *) (regp + regi)); |
| } |
| supply_register (PS_REGNUM, (char *) (regp + R_PS)); |
| supply_register (PC_REGNUM, (char *) (regp + R_PC)); |
| } |
| |
| void |
| fill_gregset (gregset_t *gregsetp, int regno) |
| { |
| int regi; |
| greg_t *regp = (greg_t *) gregsetp; |
| |
| for (regi = 0; regi < R_PC; regi++) |
| { |
| if (regno == -1 || regno == regi) |
| regcache_collect (regi, regp + regi); |
| } |
| if (regno == -1 || regno == PS_REGNUM) |
| regcache_collect (PS_REGNUM, regp + R_PS); |
| if (regno == -1 || regno == PC_REGNUM) |
| regcache_collect (PC_REGNUM, regp + R_PC); |
| } |
| |
| #if defined (FP0_REGNUM) |
| |
| /* Given a pointer to a floating point register set in /proc format |
| (fpregset_t *), unpack the register contents and supply them as gdb's |
| idea of the current floating point register values. */ |
| |
| void |
| supply_fpregset (fpregset_t *fpregsetp) |
| { |
| int regi; |
| char *from; |
| |
| for (regi = FP0_REGNUM; regi < M68K_FPC_REGNUM; regi++) |
| { |
| from = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]); |
| supply_register (regi, from); |
| } |
| supply_register (M68K_FPC_REGNUM, (char *) &(fpregsetp->f_pcr)); |
| supply_register (M68K_FPS_REGNUM, (char *) &(fpregsetp->f_psr)); |
| supply_register (M68K_FPI_REGNUM, (char *) &(fpregsetp->f_fpiaddr)); |
| } |
| |
| /* Given a pointer to a floating point register set in /proc format |
| (fpregset_t *), update the register specified by REGNO from gdb's idea |
| of the current floating point register set. If REGNO is -1, update |
| them all. */ |
| |
| void |
| fill_fpregset (fpregset_t *fpregsetp, int regno) |
| { |
| int regi; |
| |
| for (regi = FP0_REGNUM; regi < M68K_FPC_REGNUM; regi++) |
| { |
| if (regno == -1 || regno == regi) |
| regcache_collect (regi, &fpregsetp->f_fpregs[regi - FP0_REGNUM][0]); |
| } |
| if (regno == -1 || regno == M68K_FPC_REGNUM) |
| regcache_collect (M68K_FPC_REGNUM, &fpregsetp->f_pcr); |
| if (regno == -1 || regno == M68K_FPS_REGNUM) |
| regcache_collect (M68K_FPS_REGNUM, &fpregsetp->f_psr); |
| if (regno == -1 || regno == M68K_FPI_REGNUM) |
| regcache_collect (M68K_FPI_REGNUM, &fpregsetp->f_fpiaddr); |
| } |
| |
| #endif /* defined (FP0_REGNUM) */ |
| |
| #endif /* USE_PROC_FS */ |
| |
| /* Figure out where the longjmp will land. Slurp the args out of the stack. |
| We expect the first arg to be a pointer to the jmp_buf structure from which |
| we extract the pc (JB_PC) that we will land at. The pc is copied into PC. |
| This routine returns true on success. */ |
| |
| int |
| m68k_get_longjmp_target (CORE_ADDR *pc) |
| { |
| char *buf; |
| CORE_ADDR sp, jb_addr; |
| struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| |
| if (tdep->jb_pc < 0) |
| { |
| internal_error (__FILE__, __LINE__, |
| "m68k_get_longjmp_target: not implemented"); |
| return 0; |
| } |
| |
| buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT); |
| sp = read_register (SP_REGNUM); |
| |
| if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack */ |
| buf, TARGET_PTR_BIT / TARGET_CHAR_BIT)) |
| return 0; |
| |
| jb_addr = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
| |
| if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf, |
| TARGET_PTR_BIT / TARGET_CHAR_BIT)) |
| return 0; |
| |
| *pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
| return 1; |
| } |
| |
| /* Function: m68k_gdbarch_init |
| Initializer function for the m68k gdbarch vector. |
| Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ |
| |
| static struct gdbarch * |
| m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
| { |
| struct gdbarch_tdep *tdep = NULL; |
| struct gdbarch *gdbarch; |
| |
| /* find a candidate among the list of pre-declared architectures. */ |
| arches = gdbarch_list_lookup_by_info (arches, &info); |
| if (arches != NULL) |
| return (arches->gdbarch); |
| |
| tdep = xmalloc (sizeof (struct gdbarch_tdep)); |
| gdbarch = gdbarch_alloc (&info, tdep); |
| |
| set_gdbarch_long_double_format (gdbarch, &floatformat_m68881_ext); |
| set_gdbarch_long_double_bit (gdbarch, 96); |
| |
| set_gdbarch_skip_prologue (gdbarch, m68k_skip_prologue); |
| set_gdbarch_breakpoint_from_pc (gdbarch, m68k_local_breakpoint_from_pc); |
| |
| /* Stack grows down. */ |
| set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
| set_gdbarch_parm_boundary (gdbarch, 32); |
| |
| set_gdbarch_believe_pcc_promotion (gdbarch, 1); |
| set_gdbarch_decr_pc_after_break (gdbarch, 2); |
| |
| set_gdbarch_extract_return_value (gdbarch, m68k_extract_return_value); |
| set_gdbarch_store_return_value (gdbarch, m68k_store_return_value); |
| set_gdbarch_deprecated_extract_struct_value_address (gdbarch, m68k_extract_struct_value_address); |
| set_gdbarch_use_struct_convention (gdbarch, m68k_use_struct_convention); |
| |
| set_gdbarch_deprecated_frameless_function_invocation (gdbarch, m68k_frameless_function_invocation); |
| set_gdbarch_frame_args_skip (gdbarch, 8); |
| |
| set_gdbarch_register_type (gdbarch, m68k_register_type); |
| set_gdbarch_register_name (gdbarch, m68k_register_name); |
| set_gdbarch_num_regs (gdbarch, 29); |
| set_gdbarch_register_bytes_ok (gdbarch, m68k_register_bytes_ok); |
| set_gdbarch_sp_regnum (gdbarch, M68K_SP_REGNUM); |
| set_gdbarch_pc_regnum (gdbarch, M68K_PC_REGNUM); |
| set_gdbarch_ps_regnum (gdbarch, M68K_PS_REGNUM); |
| set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_REGNUM); |
| |
| set_gdbarch_push_dummy_call (gdbarch, m68k_push_dummy_call); |
| |
| /* Disassembler. */ |
| set_gdbarch_print_insn (gdbarch, print_insn_m68k); |
| |
| #if defined JB_PC && defined JB_ELEMENT_SIZE |
| tdep->jb_pc = JB_PC; |
| tdep->jb_elt_size = JB_ELEMENT_SIZE; |
| #else |
| tdep->jb_pc = -1; |
| #endif |
| tdep->get_sigtramp_info = NULL; |
| tdep->struct_return = pcc_struct_return; |
| |
| /* Frame unwinder. */ |
| set_gdbarch_unwind_dummy_id (gdbarch, m68k_unwind_dummy_id); |
| set_gdbarch_unwind_pc (gdbarch, m68k_unwind_pc); |
| |
| /* Hook in the DWARF CFI frame unwinder. */ |
| frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer); |
| |
| frame_base_set_default (gdbarch, &m68k_frame_base); |
| |
| /* Hook in ABI-specific overrides, if they have been registered. */ |
| gdbarch_init_osabi (info, gdbarch); |
| |
| /* 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, m68k_get_longjmp_target); |
| |
| frame_unwind_append_sniffer (gdbarch, m68k_sigtramp_frame_sniffer); |
| frame_unwind_append_sniffer (gdbarch, m68k_frame_sniffer); |
| |
| return gdbarch; |
| } |
| |
| |
| static void |
| m68k_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file) |
| { |
| struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| |
| if (tdep == NULL) |
| return; |
| } |
| |
| extern initialize_file_ftype _initialize_m68k_tdep; /* -Wmissing-prototypes */ |
| |
| void |
| _initialize_m68k_tdep (void) |
| { |
| gdbarch_register (bfd_arch_m68k, m68k_gdbarch_init, m68k_dump_tdep); |
| } |