* [binutils-gdb] gas: Skip SFrame FDE if .cfi_window_save
@ 2024-07-04 8:40 Jens Remus
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From: Jens Remus @ 2024-07-04 8:40 UTC (permalink / raw)
To: binutils-cvs
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=541d3b645853ef2e392a04089702bf6b4b594176
commit 541d3b645853ef2e392a04089702bf6b4b594176
Author: Jens Remus <jremus@linux.ibm.com>
Date: Thu Jul 4 10:34:12 2024 +0200
gas: Skip SFrame FDE if .cfi_window_save
CFI opcode DW_CFA_AARCH64_negate_ra_state is multiplexed with
DW_CFA_GNU_window_save. Process DW_CFA_AARCH64_negate_ra_state on
AArch64. Skip generation of SFrame FDE otherwise with the following
warning message:
skipping SFrame FDE; .cfi_window_save
gas/
* gen-sframe.c: Skip SFrame FDE if .cfi_window_save.
Signed-off-by: Jens Remus <jremus@linux.ibm.com>
Diff:
---
gas/gen-sframe.c | 25 ++++++++++++++++++++++---
1 file changed, 22 insertions(+), 3 deletions(-)
diff --git a/gas/gen-sframe.c b/gas/gen-sframe.c
index c29c407cc86..2222d768799 100644
--- a/gas/gen-sframe.c
+++ b/gas/gen-sframe.c
@@ -1256,12 +1256,12 @@ sframe_xlate_do_restore (struct sframe_xlate_ctx *xlate_ctx,
return SFRAME_XLATE_OK;
}
-/* Translate DW_CFA_GNU_window_save into SFrame context.
+/* Translate DW_CFA_AARCH64_negate_ra_state into SFrame context.
Return SFRAME_XLATE_OK if success. */
static int
-sframe_xlate_do_gnu_window_save (struct sframe_xlate_ctx *xlate_ctx,
- struct cfi_insn_data *cfi_insn ATTRIBUTE_UNUSED)
+sframe_xlate_do_aarch64_negate_ra_state (struct sframe_xlate_ctx *xlate_ctx,
+ struct cfi_insn_data *cfi_insn ATTRIBUTE_UNUSED)
{
struct sframe_row_entry *cur_fre = xlate_ctx->cur_fre;
@@ -1273,6 +1273,25 @@ sframe_xlate_do_gnu_window_save (struct sframe_xlate_ctx *xlate_ctx,
return SFRAME_XLATE_OK;
}
+/* Translate DW_CFA_GNU_window_save into SFrame context.
+ DW_CFA_AARCH64_negate_ra_state is multiplexed with DW_CFA_GNU_window_save.
+ Return SFRAME_XLATE_OK if success. */
+
+static int
+sframe_xlate_do_gnu_window_save (struct sframe_xlate_ctx *xlate_ctx,
+ struct cfi_insn_data *cfi_insn)
+{
+ unsigned char abi_arch = sframe_get_abi_arch ();
+
+ /* Translate DW_CFA_AARCH64_negate_ra_state into SFrame context. */
+ if (abi_arch == SFRAME_ABI_AARCH64_ENDIAN_BIG
+ || abi_arch == SFRAME_ABI_AARCH64_ENDIAN_LITTLE)
+ return sframe_xlate_do_aarch64_negate_ra_state (xlate_ctx, cfi_insn);
+
+ as_warn (_("skipping SFrame FDE; .cfi_window_save"));
+ return SFRAME_XLATE_ERR_NOTREPRESENTED; /* Not represented. */
+}
+
/* Returns the DWARF call frame instruction name or fake CFI name for the
specified CFI opcode, or NULL if the value is not recognized. */
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