diff options
Diffstat (limited to 'gdb/rs6000-tdep.c')
| -rw-r--r-- | gdb/rs6000-tdep.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/gdb/rs6000-tdep.c b/gdb/rs6000-tdep.c index 48c8e4c..55f2ee0 100644 --- a/gdb/rs6000-tdep.c +++ b/gdb/rs6000-tdep.c @@ -2947,6 +2947,68 @@ rs6000_frame_base_sniffer (struct frame_info *next_frame) return &rs6000_frame_base; } +/* DWARF-2 frame support. Used to handle the detection of + clobbered registers during function calls. */ + +static void +ppc_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum, + struct dwarf2_frame_state_reg *reg, + struct frame_info *next_frame) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + + /* PPC32 and PPC64 ABI's are the same regarding volatile and + non-volatile registers. We will use the same code for both. */ + + /* Call-saved GP registers. */ + if ((regnum >= tdep->ppc_gp0_regnum + 14 + && regnum <= tdep->ppc_gp0_regnum + 31) + || (regnum == tdep->ppc_gp0_regnum + 1)) + reg->how = DWARF2_FRAME_REG_SAME_VALUE; + + /* Call-clobbered GP registers. */ + if ((regnum >= tdep->ppc_gp0_regnum + 3 + && regnum <= tdep->ppc_gp0_regnum + 12) + || (regnum == tdep->ppc_gp0_regnum)) + reg->how = DWARF2_FRAME_REG_UNDEFINED; + + /* Deal with FP registers, if supported. */ + if (tdep->ppc_fp0_regnum >= 0) + { + /* Call-saved FP registers. */ + if ((regnum >= tdep->ppc_fp0_regnum + 14 + && regnum <= tdep->ppc_fp0_regnum + 31)) + reg->how = DWARF2_FRAME_REG_SAME_VALUE; + + /* Call-clobbered FP registers. */ + if ((regnum >= tdep->ppc_fp0_regnum + && regnum <= tdep->ppc_fp0_regnum + 13)) + reg->how = DWARF2_FRAME_REG_UNDEFINED; + } + + /* Deal with ALTIVEC registers, if supported. */ + if (tdep->ppc_vr0_regnum > 0 && tdep->ppc_vrsave_regnum > 0) + { + /* Call-saved Altivec registers. */ + if ((regnum >= tdep->ppc_vr0_regnum + 20 + && regnum <= tdep->ppc_vr0_regnum + 31) + || regnum == tdep->ppc_vrsave_regnum) + reg->how = DWARF2_FRAME_REG_SAME_VALUE; + + /* Call-clobbered Altivec registers. */ + if ((regnum >= tdep->ppc_vr0_regnum + && regnum <= tdep->ppc_vr0_regnum + 19)) + reg->how = DWARF2_FRAME_REG_UNDEFINED; + } + + /* Handle PC register and Stack Pointer correctly. */ + if (regnum == gdbarch_pc_regnum (current_gdbarch)) + reg->how = DWARF2_FRAME_REG_RA; + else if (regnum == gdbarch_sp_regnum (current_gdbarch)) + reg->how = DWARF2_FRAME_REG_CFA; +} + + /* 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. @@ -3410,6 +3472,9 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer); dwarf2_frame_set_adjust_regnum (gdbarch, rs6000_adjust_frame_regnum); + /* Frame handling. */ + dwarf2_frame_set_init_reg (gdbarch, ppc_dwarf2_frame_init_reg); + /* Hook in ABI-specific overrides, if they have been registered. */ gdbarch_init_osabi (info, gdbarch); |