diff options
Diffstat (limited to 'gcc/config/arm/arm.c')
| -rw-r--r-- | gcc/config/arm/arm.c | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c index 53dd0dd0f09..d906b14c514 100644 --- a/gcc/config/arm/arm.c +++ b/gcc/config/arm/arm.c @@ -7804,27 +7804,34 @@ arm_expand_prologue () If neither of these places is available, we abort (for now). - Note - setting RTX_FRAME_RELATED_P on these insns breaks - the dwarf2 parsing code in various bits of gcc. This ought - to be fixed sometime, but until then the flag is suppressed. - [Use gcc/testsuite/gcc.c-torture/execute/921215-1.c with - "-O3 -g" to test this]. */ + Note - we only need to tell the dwarf2 backend about the SP + adjustment in the second variant; the static chain register + doesn't need to be unwound, as it doesn't contain a value + inherited from the caller. */ if (regs_ever_live[3] == 0) { insn = gen_rtx_REG (SImode, 3); insn = gen_rtx_SET (SImode, insn, ip_rtx); insn = emit_insn (insn); - /* RTX_FRAME_RELATED_P (insn) = 1; */ } else if (current_function_pretend_args_size == 0) { + rtx dwarf; insn = gen_rtx_PRE_DEC (SImode, stack_pointer_rtx); insn = gen_rtx_MEM (SImode, insn); insn = gen_rtx_SET (VOIDmode, insn, ip_rtx); insn = emit_insn (insn); - /* RTX_FRAME_RELATED_P (insn) = 1; */ + fp_offset = 4; + + /* Just tell the dwarf backend that we adjusted SP. */ + dwarf = gen_rtx_SET (VOIDmode, stack_pointer_rtx, + gen_rtx_PLUS (SImode, stack_pointer_rtx, + GEN_INT (-fp_offset))); + RTX_FRAME_RELATED_P (insn) = 1; + REG_NOTES (insn) = gen_rtx_EXPR_LIST (REG_FRAME_RELATED_EXPR, + dwarf, REG_NOTES (insn)); } else /* FIXME - the way to handle this situation is to allow @@ -7931,7 +7938,6 @@ arm_expand_prologue () insn = gen_rtx_REG (SImode, 3); insn = gen_rtx_SET (SImode, ip_rtx, insn); insn = emit_insn (insn); - /* RTX_FRAME_RELATED_P (insn) = 1; */ } else /* if (current_function_pretend_args_size == 0) */ { @@ -7939,7 +7945,6 @@ arm_expand_prologue () insn = gen_rtx_MEM (SImode, insn); insn = gen_rtx_SET (SImode, ip_rtx, insn); insn = emit_insn (insn); - /* RTX_FRAME_RELATED_P (insn) = 1; */ } } } |