diff options
Diffstat (limited to 'gdb/rs6000-tdep.c')
| -rw-r--r-- | gdb/rs6000-tdep.c | 71 |
1 files changed, 53 insertions, 18 deletions
diff --git a/gdb/rs6000-tdep.c b/gdb/rs6000-tdep.c index a5b7091..d61fe58 100644 --- a/gdb/rs6000-tdep.c +++ b/gdb/rs6000-tdep.c @@ -1357,6 +1357,39 @@ bl_to_blrl_insn_p (CORE_ADDR pc, int insn, enum bfd_endian byte_order) return 0; } +/* Return true if OP is a stw or std instruction with + register operands RS and RA and any immediate offset. + + If WITH_UPDATE is true, also return true if OP is + a stwu or stdu instruction with the same operands. + + Return false otherwise. + */ +static bool +store_insn_p (unsigned long op, unsigned long rs, + unsigned long ra, bool with_update) +{ + rs = rs << 21; + ra = ra << 16; + + if (/* std RS, SIMM(RA) */ + ((op & 0xffff0003) == (rs | ra | 0xf8000000)) || + /* stw RS, SIMM(RA) */ + ((op & 0xffff0000) == (rs | ra | 0x90000000))) + return true; + + if (with_update) + { + if (/* stdu RS, SIMM(RA) */ + ((op & 0xffff0003) == (rs | ra | 0xf8000001)) || + /* stwu RS, SIMM(RA) */ + ((op & 0xffff0000) == (rs | ra | 0x94000000))) + return true; + } + + return false; +} + /* Masks for decoding a branch-and-link (bl) instruction. BL_MASK and BL_INSTRUCTION are used in combination with each other. @@ -1583,6 +1616,7 @@ skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, CORE_ADDR lim_pc, gdb_byte buf[4]; unsigned long op; long offset = 0; + long alloca_reg_offset = 0; long vr_saved_offset = 0; int lr_reg = -1; int cr_reg = -1; @@ -1654,14 +1688,14 @@ skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, CORE_ADDR lim_pc, remember just the first one, but skip over additional ones. */ if (lr_reg == -1) - lr_reg = (op & 0x03e00000); + lr_reg = (op & 0x03e00000) >> 21; if (lr_reg == 0) r0_contains_arg = 0; continue; } else if ((op & 0xfc1fffff) == 0x7c000026) { /* mfcr Rx */ - cr_reg = (op & 0x03e00000); + cr_reg = (op & 0x03e00000) >> 21; if (cr_reg == 0) r0_contains_arg = 0; continue; @@ -1738,14 +1772,17 @@ skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, CORE_ADDR lim_pc, } else if (lr_reg >= 0 && - /* std Rx, NUM(r1) || stdu Rx, NUM(r1) */ - (((op & 0xffff0000) == (lr_reg | 0xf8010000)) || - /* stw Rx, NUM(r1) */ - ((op & 0xffff0000) == (lr_reg | 0x90010000)) || - /* stwu Rx, NUM(r1) */ - ((op & 0xffff0000) == (lr_reg | 0x94010000)))) - { /* where Rx == lr */ - fdata->lr_offset = offset; + ((store_insn_p (op, lr_reg, 1, true)) || + (framep && + (store_insn_p (op, lr_reg, + fdata->alloca_reg - tdep->ppc_gp0_regnum, + false))))) + { + if (store_insn_p (op, lr_reg, 1, true)) + fdata->lr_offset = offset; + else /* LR save through frame pointer. */ + fdata->lr_offset = alloca_reg_offset; + fdata->nosavedpc = 0; /* Invalidate lr_reg, but don't set it to -1. That would mean that it had never been set. */ @@ -1760,13 +1797,8 @@ skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, CORE_ADDR lim_pc, } else if (cr_reg >= 0 && - /* std Rx, NUM(r1) || stdu Rx, NUM(r1) */ - (((op & 0xffff0000) == (cr_reg | 0xf8010000)) || - /* stw Rx, NUM(r1) */ - ((op & 0xffff0000) == (cr_reg | 0x90010000)) || - /* stwu Rx, NUM(r1) */ - ((op & 0xffff0000) == (cr_reg | 0x94010000)))) - { /* where Rx == cr */ + (store_insn_p (op, cr_reg, 1, true))) + { fdata->cr_offset = offset; /* Invalidate cr_reg, but don't set it to -1. That would mean that it had never been set. */ @@ -1920,6 +1952,7 @@ skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, CORE_ADDR lim_pc, fdata->frameless = 0; framep = 1; fdata->alloca_reg = (tdep->ppc_gp0_regnum + 29); + alloca_reg_offset = offset; continue; /* Another way to set up the frame pointer. */ @@ -1930,6 +1963,7 @@ skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, CORE_ADDR lim_pc, fdata->frameless = 0; framep = 1; fdata->alloca_reg = (tdep->ppc_gp0_regnum + 31); + alloca_reg_offset = offset; continue; /* Another way to set up the frame pointer. */ @@ -1940,6 +1974,7 @@ skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, CORE_ADDR lim_pc, framep = 1; fdata->alloca_reg = (tdep->ppc_gp0_regnum + ((op & ~0x38010000) >> 21)); + alloca_reg_offset = offset; continue; } /* AltiVec related instructions. */ @@ -2180,7 +2215,7 @@ skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, CORE_ADDR lim_pc, #endif /* 0 */ if (pc == lim_pc && lr_reg >= 0) - fdata->lr_register = lr_reg >> 21; + fdata->lr_register = lr_reg; fdata->offset = -fdata->offset; return last_prologue_pc; |