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23 | 23 | #include "gdb_string.h"
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24 | 24 | #include "solib.h"
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25 | 25 | #include "solib-irix.h"
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26 |
| - |
27 | 26 | #include "elf-bfd.h"
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| 27 | +#include "mips-tdep.h" |
| 28 | +#include "trad-frame.h" |
| 29 | +#include "tramp-frame.h" |
28 | 30 |
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29 | 31 | static void
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30 | 32 | mips_irix_elf_osabi_sniff_abi_tag_sections (bfd *abfd, asection *sect,
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@@ -77,11 +79,160 @@ mips_irix_elf_osabi_sniffer (bfd *abfd)
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77 | 79 | return osabi;
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78 | 80 | }
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79 | 81 |
|
| 82 | +/* Unwinding past the signal handler on mips-irix. |
| 83 | +
|
| 84 | + Note: The following has only been tested with N32, but can probably |
| 85 | + be made to work with a small number of adjustments. |
| 86 | +
|
| 87 | + On mips-irix, the sigcontext_t structure is stored at the base |
| 88 | + of the frame established by the _sigtramp function. The definition |
| 89 | + of this structure can be found in <sys/signal.h> (comments have been |
| 90 | + C++'ified to avoid a collision with the C-style comment delimiters |
| 91 | + used by this comment): |
| 92 | +
|
| 93 | + typedef struct sigcontext { |
| 94 | + __uint32_t sc_regmask; // regs to restore in sigcleanup |
| 95 | + __uint32_t sc_status; // cp0 status register |
| 96 | + __uint64_t sc_pc; // pc at time of signal |
| 97 | + // General purpose registers |
| 98 | + __uint64_t sc_regs[32]; // processor regs 0 to 31 |
| 99 | + // Floating point coprocessor state |
| 100 | + __uint64_t sc_fpregs[32]; // fp regs 0 to 31 |
| 101 | + __uint32_t sc_ownedfp; // fp has been used |
| 102 | + __uint32_t sc_fpc_csr; // fpu control and status reg |
| 103 | + __uint32_t sc_fpc_eir; // fpu exception instruction reg |
| 104 | + // implementation/revision |
| 105 | + __uint32_t sc_ssflags; // signal stack state to restore |
| 106 | + __uint64_t sc_mdhi; // Multiplier hi and low regs |
| 107 | + __uint64_t sc_mdlo; |
| 108 | + // System coprocessor registers at time of signal |
| 109 | + __uint64_t sc_cause; // cp0 cause register |
| 110 | + __uint64_t sc_badvaddr; // cp0 bad virtual address |
| 111 | + __uint64_t sc_triggersave; // state of graphics trigger (SGI) |
| 112 | + sigset_t sc_sigset; // signal mask to restore |
| 113 | + __uint64_t sc_fp_rounded_result; // for Ieee 754 support |
| 114 | + __uint64_t sc_pad[31]; |
| 115 | + } sigcontext_t; |
| 116 | +
|
| 117 | + The following macros provide the offset of some of the fields |
| 118 | + used to retrieve the value of the registers before the signal |
| 119 | + was raised. */ |
| 120 | + |
| 121 | +/* The size of the sigtramp frame. The sigtramp frame base can then |
| 122 | + be computed by adding this size to the SP. */ |
| 123 | +#define SIGTRAMP_FRAME_SIZE 48 |
| 124 | +/* The offset in sigcontext_t where the PC is saved. */ |
| 125 | +#define SIGCONTEXT_PC_OFF 8 |
| 126 | +/* The offset in sigcontext_t where the GP registers are saved. */ |
| 127 | +#define SIGCONTEXT_REGS_OFF (SIGCONTEXT_PC_OFF + 8) |
| 128 | +/* The offset in sigcontext_t where the FP regsiters are saved. */ |
| 129 | +#define SIGCONTEXT_FPREGS_OFF (SIGCONTEXT_REGS_OFF + 32 * 8) |
| 130 | +/* The offset in sigcontext_t where the FP CSR register is saved. */ |
| 131 | +#define SIGCONTEXT_FPCSR_OFF (SIGCONTEXT_FPREGS_OFF + 32 * 8 + 4) |
| 132 | +/* The offset in sigcontext_t where the multiplier hi register is saved. */ |
| 133 | +#define SIGCONTEXT_HI_OFF (SIGCONTEXT_FPCSR_OFF + 2 * 4) |
| 134 | +/* The offset in sigcontext_t where the multiplier lo register is saved. */ |
| 135 | +#define SIGCONTEXT_LO_OFF (SIGCONTEXT_HI_OFF + 4) |
| 136 | + |
| 137 | +/* Implement the "init" routine in struct tramp_frame for the N32 ABI |
| 138 | + on mips-irix. */ |
| 139 | +static void |
| 140 | +mips_irix_n32_tramp_frame_init (const struct tramp_frame *self, |
| 141 | + struct frame_info *this_frame, |
| 142 | + struct trad_frame_cache *this_cache, |
| 143 | + CORE_ADDR func) |
| 144 | +{ |
| 145 | + struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 146 | + const int num_regs = gdbarch_num_regs (gdbarch); |
| 147 | + int sp_cooked_regno = num_regs + MIPS_SP_REGNUM; |
| 148 | + const CORE_ADDR sp = get_frame_register_signed (this_frame, sp_cooked_regno); |
| 149 | + const CORE_ADDR sigcontext_base = sp + 48; |
| 150 | + const struct mips_regnum *regs = mips_regnum (gdbarch); |
| 151 | + int ireg; |
| 152 | + |
| 153 | + trad_frame_set_reg_addr (this_cache, regs->pc + gdbarch_num_regs (gdbarch), |
| 154 | + sigcontext_base + SIGCONTEXT_PC_OFF); |
| 155 | + |
| 156 | + for (ireg = 1; ireg < 32; ireg++) |
| 157 | + trad_frame_set_reg_addr (this_cache, ireg + MIPS_ZERO_REGNUM + num_regs, |
| 158 | + sigcontext_base + SIGCONTEXT_REGS_OFF + ireg * 8); |
| 159 | + |
| 160 | + for (ireg = 0; ireg < 32; ireg++) |
| 161 | + trad_frame_set_reg_addr (this_cache, ireg + regs->fp0 + num_regs, |
| 162 | + sigcontext_base + SIGCONTEXT_FPREGS_OFF |
| 163 | + + ireg * 8); |
| 164 | + |
| 165 | + trad_frame_set_reg_addr (this_cache, regs->fp_control_status + num_regs, |
| 166 | + sigcontext_base + SIGCONTEXT_FPCSR_OFF); |
| 167 | + |
| 168 | + trad_frame_set_reg_addr (this_cache, regs->hi + num_regs, |
| 169 | + sigcontext_base + SIGCONTEXT_HI_OFF); |
| 170 | + |
| 171 | + trad_frame_set_reg_addr (this_cache, regs->lo + num_regs, |
| 172 | + sigcontext_base + SIGCONTEXT_LO_OFF); |
| 173 | + |
| 174 | + trad_frame_set_id (this_cache, frame_id_build (sigcontext_base, func)); |
| 175 | +} |
| 176 | + |
| 177 | +/* The tramp_frame structure describing sigtramp frames on mips-irix N32. |
| 178 | +
|
| 179 | + Note that the list of instructions below is pretty much a pure dump |
| 180 | + of function _sigtramp on mips-irix. A few instructions are actually |
| 181 | + not tested (mask set to 0), because a portion of these instructions |
| 182 | + contain an address which changes due to relocation. We could use |
| 183 | + a smarter mask that checks the instrutction code alone, but given |
| 184 | + the number of instructions already being checked, this seemed |
| 185 | + unnecessary. */ |
| 186 | + |
| 187 | +static const struct tramp_frame mips_irix_n32_tramp_frame = |
| 188 | +{ |
| 189 | + SIGTRAMP_FRAME, |
| 190 | + 4, |
| 191 | + { |
| 192 | + { 0x3c0c8000, -1 }, /* lui t0,0x8000 */ |
| 193 | + { 0x27bdffd0, -1 }, /* addiu sp,sp,-48 */ |
| 194 | + { 0x008c6024, -1 }, /* and t0,a0,t0 */ |
| 195 | + { 0xffa40018, -1 }, /* sd a0,24(sp) */ |
| 196 | + { 0x00000000, 0 }, /* beqz t0,0xfaefcb8 <_sigtramp+40> */ |
| 197 | + { 0xffa60028, -1 }, /* sd a2,40(sp) */ |
| 198 | + { 0x01806027, -1 }, /* nor t0,t0,zero */ |
| 199 | + { 0xffa00020, -1 }, /* sd zero,32(sp) */ |
| 200 | + { 0x00000000, 0 }, /* b 0xfaefcbc <_sigtramp+44> */ |
| 201 | + { 0x008c2024, -1 }, /* and a0,a0,t0 */ |
| 202 | + { 0xffa60020, -1 }, /* sd a2,32(sp) */ |
| 203 | + { 0x03e0c025, -1 }, /* move t8,ra */ |
| 204 | + { 0x00000000, 0 }, /* bal 0xfaefcc8 <_sigtramp+56> */ |
| 205 | + { 0x00000000, -1 }, /* nop */ |
| 206 | + { 0x3c0c0007, -1 }, /* lui t0,0x7 */ |
| 207 | + { 0x00e0c825, -1 }, /* move t9,a3 */ |
| 208 | + { 0x658c80fc, -1 }, /* daddiu t0,t0,-32516 */ |
| 209 | + { 0x019f602d, -1 }, /* daddu t0,t0,ra */ |
| 210 | + { 0x0300f825, -1 }, /* move ra,t8 */ |
| 211 | + { 0x8d8c9880, -1 }, /* lw t0,-26496(t0) */ |
| 212 | + { 0x8d8c0000, -1 }, /* lw t0,0(t0) */ |
| 213 | + { 0x8d8d0000, -1 }, /* lw t1,0(t0) */ |
| 214 | + { 0xffac0008, -1 }, /* sd t0,8(sp) */ |
| 215 | + { 0x0320f809, -1 }, /* jalr t9 */ |
| 216 | + { 0xffad0010, -1 }, /* sd t1,16(sp) */ |
| 217 | + { 0xdfad0010, -1 }, /* ld t1,16(sp) */ |
| 218 | + { 0xdfac0008, -1 }, /* ld t0,8(sp) */ |
| 219 | + { 0xad8d0000, -1 }, /* sw t1,0(t0) */ |
| 220 | + { 0xdfa40020, -1 }, /* ld a0,32(sp) */ |
| 221 | + { 0xdfa50028, -1 }, /* ld a1,40(sp) */ |
| 222 | + { 0xdfa60018, -1 }, /* ld a2,24(sp) */ |
| 223 | + { 0x24020440, -1 }, /* li v0,1088 */ |
| 224 | + { 0x0000000c, -1 }, /* syscall */ |
| 225 | + { TRAMP_SENTINEL_INSN, -1 } |
| 226 | + }, |
| 227 | + mips_irix_n32_tramp_frame_init |
| 228 | +}; |
| 229 | + |
80 | 230 | static void
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81 | 231 | mips_irix_init_abi (struct gdbarch_info info,
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82 | 232 | struct gdbarch *gdbarch)
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83 | 233 | {
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84 | 234 | set_solib_ops (gdbarch, &irix_so_ops);
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| 235 | + tramp_frame_prepend_unwinder (gdbarch, &mips_irix_n32_tramp_frame); |
85 | 236 | }
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86 | 237 |
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87 | 238 | /* Provide a prototype to silence -Wmissing-prototypes. */
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