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2007-10-21 Luis Machado <luisgpm@br.ibm.com>
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* rs6000-tdep.c (ppc_dwarf2_frame_init_reg): New function.
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* (rs6000_gdbarch_init): Install ppc_dwarf2_frame_init_reg as
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default dwarf2_frame_set_init_reg function.
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===================================================================
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RCS file: /cvs/src/src/gdb/rs6000-tdep.c,v
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retrieving revision 1.292
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retrieving revision 1.293
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diff -u -r1.292 -r1.293
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--- src/gdb/rs6000-tdep.c 2007/10/19 12:26:34 1.292
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+++ src/gdb/rs6000-tdep.c 2007/10/21 20:04:47 1.293
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@@ -2947,6 +2947,68 @@
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return &rs6000_frame_base;
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}
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+/* DWARF-2 frame support. Used to handle the detection of
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+ clobbered registers during function calls. */
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+
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+static void
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+ppc_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum,
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+ struct dwarf2_frame_state_reg *reg,
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+ struct frame_info *next_frame)
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+{
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+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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+
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+ /* PPC32 and PPC64 ABI's are the same regarding volatile and
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+ non-volatile registers. We will use the same code for both. */
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+
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+ /* Call-saved GP registers. */
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+ if ((regnum >= tdep->ppc_gp0_regnum + 14
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+ && regnum <= tdep->ppc_gp0_regnum + 31)
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+ || (regnum == tdep->ppc_gp0_regnum + 1))
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+ reg->how = DWARF2_FRAME_REG_SAME_VALUE;
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+
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+ /* Call-clobbered GP registers. */
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+ if ((regnum >= tdep->ppc_gp0_regnum + 3
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+ && regnum <= tdep->ppc_gp0_regnum + 12)
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+ || (regnum == tdep->ppc_gp0_regnum))
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+ reg->how = DWARF2_FRAME_REG_UNDEFINED;
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+
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+ /* Deal with FP registers, if supported. */
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+ if (tdep->ppc_fp0_regnum >= 0)
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+ {
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+ /* Call-saved FP registers. */
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+ if ((regnum >= tdep->ppc_fp0_regnum + 14
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+ && regnum <= tdep->ppc_fp0_regnum + 31))
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+ reg->how = DWARF2_FRAME_REG_SAME_VALUE;
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+
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+ /* Call-clobbered FP registers. */
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+ if ((regnum >= tdep->ppc_fp0_regnum
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+ && regnum <= tdep->ppc_fp0_regnum + 13))
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+ reg->how = DWARF2_FRAME_REG_UNDEFINED;
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+ }
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+
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+ /* Deal with ALTIVEC registers, if supported. */
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+ if (tdep->ppc_vr0_regnum > 0 && tdep->ppc_vrsave_regnum > 0)
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+ {
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+ /* Call-saved Altivec registers. */
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+ if ((regnum >= tdep->ppc_vr0_regnum + 20
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+ && regnum <= tdep->ppc_vr0_regnum + 31)
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+ || regnum == tdep->ppc_vrsave_regnum)
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+ reg->how = DWARF2_FRAME_REG_SAME_VALUE;
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+
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+ /* Call-clobbered Altivec registers. */
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+ if ((regnum >= tdep->ppc_vr0_regnum
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+ && regnum <= tdep->ppc_vr0_regnum + 19))
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+ reg->how = DWARF2_FRAME_REG_UNDEFINED;
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+ }
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+
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+ /* Handle PC register and Stack Pointer correctly. */
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+ if (regnum == gdbarch_pc_regnum (current_gdbarch))
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+ reg->how = DWARF2_FRAME_REG_RA;
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+ else if (regnum == gdbarch_sp_regnum (current_gdbarch))
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+ reg->how = DWARF2_FRAME_REG_CFA;
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+}
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+
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+
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/* Initialize the current architecture based on INFO. If possible, re-use an
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architecture from ARCHES, which is a list of architectures already created
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during this debugging session.
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@@ -3410,6 +3472,9 @@
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frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);
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dwarf2_frame_set_adjust_regnum (gdbarch, rs6000_adjust_frame_regnum);
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+ /* Frame handling. */
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+ dwarf2_frame_set_init_reg (gdbarch, ppc_dwarf2_frame_init_reg);
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+
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/* Hook in ABI-specific overrides, if they have been registered. */
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gdbarch_init_osabi (info, gdbarch);
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