| /* Motorola m68k target-dependent support for GNU/Linux. |
| |
| Copyright 1996, 1998, 2000, 2001, 2002, 2003 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 "gdbcore.h" |
| #include "doublest.h" |
| #include "floatformat.h" |
| #include "frame.h" |
| #include "target.h" |
| #include "gdb_string.h" |
| #include "gdbtypes.h" |
| #include "osabi.h" |
| #include "regcache.h" |
| #include "objfiles.h" |
| #include "symtab.h" |
| #include "m68k-tdep.h" |
| |
| /* Offsets (in target ints) into jmp_buf. */ |
| |
| #define M68K_LINUX_JB_ELEMENT_SIZE 4 |
| #define M68K_LINUX_JB_PC 7 |
| |
| /* Check whether insn1 and insn2 are parts of a signal trampoline. */ |
| |
| #define IS_SIGTRAMP(insn1, insn2) \ |
| (/* addaw #20,sp; moveq #119,d0; trap #0 */ \ |
| (insn1 == 0xdefc0014 && insn2 == 0x70774e40) \ |
| /* moveq #119,d0; trap #0 */ \ |
| || insn1 == 0x70774e40) |
| |
| #define IS_RT_SIGTRAMP(insn1, insn2) \ |
| (/* movel #173,d0; trap #0 */ \ |
| (insn1 == 0x203c0000 && insn2 == 0x00ad4e40) \ |
| /* moveq #82,d0; notb d0; trap #0 */ \ |
| || (insn1 == 0x70524600 && (insn2 >> 16) == 0x4e40)) |
| |
| /* Return non-zero if PC points into the signal trampoline. For the |
| sake of m68k_linux_get_sigtramp_info we also distinguish between |
| non-RT and RT signal trampolines. */ |
| |
| static int |
| m68k_linux_pc_in_sigtramp (CORE_ADDR pc, char *name) |
| { |
| CORE_ADDR sp; |
| char buf[12]; |
| unsigned long insn0, insn1, insn2; |
| |
| if (read_memory_nobpt (pc - 4, buf, sizeof (buf))) |
| return 0; |
| insn1 = extract_unsigned_integer (buf + 4, 4); |
| insn2 = extract_unsigned_integer (buf + 8, 4); |
| if (IS_SIGTRAMP (insn1, insn2)) |
| return 1; |
| if (IS_RT_SIGTRAMP (insn1, insn2)) |
| return 2; |
| |
| insn0 = extract_unsigned_integer (buf, 4); |
| if (IS_SIGTRAMP (insn0, insn1)) |
| return 1; |
| if (IS_RT_SIGTRAMP (insn0, insn1)) |
| return 2; |
| |
| insn0 = ((insn0 << 16) & 0xffffffff) | (insn1 >> 16); |
| insn1 = ((insn1 << 16) & 0xffffffff) | (insn2 >> 16); |
| if (IS_SIGTRAMP (insn0, insn1)) |
| return 1; |
| if (IS_RT_SIGTRAMP (insn0, insn1)) |
| return 2; |
| |
| return 0; |
| } |
| |
| /* From <asm/sigcontext.h>. */ |
| static int m68k_linux_sigcontext_reg_offset[M68K_NUM_REGS] = |
| { |
| 2 * 4, /* %d0 */ |
| 3 * 4, /* %d1 */ |
| -1, /* %d2 */ |
| -1, /* %d3 */ |
| -1, /* %d4 */ |
| -1, /* %d5 */ |
| -1, /* %d6 */ |
| -1, /* %d7 */ |
| 4 * 4, /* %a0 */ |
| 5 * 4, /* %a1 */ |
| -1, /* %a2 */ |
| -1, /* %a3 */ |
| -1, /* %a4 */ |
| -1, /* %a5 */ |
| -1, /* %fp */ |
| 1 * 4, /* %sp */ |
| 5 * 4 + 2, /* %sr */ |
| 6 * 4 + 2, /* %pc */ |
| 8 * 4, /* %fp0 */ |
| 11 * 4, /* %fp1 */ |
| -1, /* %fp2 */ |
| -1, /* %fp3 */ |
| -1, /* %fp4 */ |
| -1, /* %fp5 */ |
| -1, /* %fp6 */ |
| -1, /* %fp7 */ |
| 14 * 4, /* %fpcr */ |
| 15 * 4, /* %fpsr */ |
| 16 * 4 /* %fpiaddr */ |
| }; |
| |
| /* From <asm/ucontext.h>. */ |
| static int m68k_linux_ucontext_reg_offset[M68K_NUM_REGS] = |
| { |
| 6 * 4, /* %d0 */ |
| 7 * 4, /* %d1 */ |
| 8 * 4, /* %d2 */ |
| 9 * 4, /* %d3 */ |
| 10 * 4, /* %d4 */ |
| 11 * 4, /* %d5 */ |
| 12 * 4, /* %d6 */ |
| 13 * 4, /* %d7 */ |
| 14 * 4, /* %a0 */ |
| 15 * 4, /* %a1 */ |
| 16 * 4, /* %a2 */ |
| 17 * 4, /* %a3 */ |
| 18 * 4, /* %a4 */ |
| 19 * 4, /* %a5 */ |
| 20 * 4, /* %fp */ |
| 21 * 4, /* %sp */ |
| 23 * 4, /* %sr */ |
| 22 * 4, /* %pc */ |
| 27 * 4, /* %fp0 */ |
| 30 * 4, /* %fp1 */ |
| 33 * 4, /* %fp2 */ |
| 36 * 4, /* %fp3 */ |
| 39 * 4, /* %fp4 */ |
| 42 * 4, /* %fp5 */ |
| 45 * 4, /* %fp6 */ |
| 48 * 4, /* %fp7 */ |
| 24 * 4, /* %fpcr */ |
| 25 * 4, /* %fpsr */ |
| 26 * 4 /* %fpiaddr */ |
| }; |
| |
| |
| /* Get info about saved registers in sigtramp. */ |
| |
| static struct m68k_sigtramp_info |
| m68k_linux_get_sigtramp_info (struct frame_info *next_frame) |
| { |
| CORE_ADDR sp; |
| char buf[4]; |
| struct m68k_sigtramp_info info; |
| |
| frame_unwind_register (next_frame, M68K_SP_REGNUM, buf); |
| sp = extract_unsigned_integer (buf, 4); |
| |
| /* Get sigcontext address, it is the third parameter on the stack. */ |
| info.sigcontext_addr = read_memory_unsigned_integer (sp + 8, 4); |
| |
| if (m68k_linux_pc_in_sigtramp (frame_pc_unwind (next_frame), 0) == 2) |
| info.sc_reg_offset = m68k_linux_ucontext_reg_offset; |
| else |
| info.sc_reg_offset = m68k_linux_sigcontext_reg_offset; |
| return info; |
| } |
| |
| /* 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_linux_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_linux_extract_return_value (TYPE_FIELD_TYPE (type, 0), regcache, |
| valbuf); |
| return; |
| } |
| |
| if (TYPE_CODE (type) == TYPE_CODE_FLT) |
| { |
| regcache_raw_read (regcache, M68K_FP0_REGNUM, buf); |
| convert_typed_floating (buf, builtin_type_m68881_ext, valbuf, type); |
| } |
| else if (TYPE_CODE (type) == TYPE_CODE_PTR) |
| regcache_raw_read (regcache, M68K_A0_REGNUM, valbuf); |
| else |
| { |
| 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_linux_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_linux_store_return_value (TYPE_FIELD_TYPE (type, 0), regcache, |
| valbuf); |
| return; |
| } |
| |
| if (TYPE_CODE (type) == TYPE_CODE_FLT) |
| { |
| char buf[M68K_MAX_REGISTER_SIZE]; |
| convert_typed_floating (valbuf, type, buf, builtin_type_m68881_ext); |
| regcache_raw_write (regcache, M68K_FP0_REGNUM, buf); |
| } |
| else if (TYPE_CODE (type) == TYPE_CODE_PTR) |
| regcache_raw_write (regcache, M68K_A0_REGNUM, valbuf); |
| else |
| { |
| 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 an array REGBUF containing the (raw) register state |
| the address in which a function should return its structure value, |
| as a CORE_ADDR. */ |
| |
| static CORE_ADDR |
| m68k_linux_extract_struct_value_address (struct regcache *regcache) |
| { |
| char buf[4]; |
| |
| regcache_cooked_read (regcache, M68K_A0_REGNUM, buf); |
| return extract_unsigned_integer (buf, 4); |
| } |
| |
| static void |
| m68k_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| { |
| struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| |
| tdep->jb_pc = M68K_LINUX_JB_PC; |
| tdep->jb_elt_size = M68K_LINUX_JB_ELEMENT_SIZE; |
| tdep->get_sigtramp_info = m68k_linux_get_sigtramp_info; |
| tdep->struct_return = reg_struct_return; |
| |
| set_gdbarch_extract_return_value (gdbarch, m68k_linux_extract_return_value); |
| set_gdbarch_store_return_value (gdbarch, m68k_linux_store_return_value); |
| set_gdbarch_extract_struct_value_address (gdbarch, |
| m68k_linux_extract_struct_value_address); |
| |
| set_gdbarch_pc_in_sigtramp (gdbarch, m68k_linux_pc_in_sigtramp); |
| |
| /* Shared library handling. */ |
| set_gdbarch_in_solib_call_trampoline (gdbarch, in_plt_section); |
| set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); |
| } |
| |
| void |
| _initialize_m68k_linux_tdep (void) |
| { |
| gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_LINUX, |
| m68k_linux_init_abi); |
| } |