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libsframe: s390: No further decode if sframe_get_fre_offset returns err

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SFrame FREs without any offsets will later be used to represent
.cfi_undefined RA in SFrame.

As a result the API to get the CFA offset can return an error value, if
there are no offsets.  Do not apply the s390x-specific decoding of CFA
offset on the error return value.

libsframe/
	* sframe.c (sframe_fre_get_cfa_offset): Do not apply s390x-
	specific decoding to error return value.

Signed-off-by: Jens Remus <jremus@linux.ibm.com>
This commit is contained in:
Jens Remus
2025-10-15 17:45:48 +02:00
parent c47ec3b44a
commit 52308aeca8
1 changed files with 5 additions and 2 deletions
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7
libsframe/sframe.c
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@@ -698,12 +698,15 @@ int32_t
sframe_fre_get_cfa_offset (sframe_decoder_ctx *dctx, sframe_fre_get_cfa_offset (sframe_decoder_ctx *dctx,
sframe_frame_row_entry *fre, int *errp) sframe_frame_row_entry *fre, int *errp)
{ {
int32_t offset = sframe_get_fre_offset (fre, SFRAME_FRE_CFA_OFFSET_IDX, errp); int err;
int32_t offset = sframe_get_fre_offset (fre, SFRAME_FRE_CFA_OFFSET_IDX, &err);
/* For s390x undo adjustment of CFA offset (to enable 8-bit offsets). */ /* For s390x undo adjustment of CFA offset (to enable 8-bit offsets). */
if (sframe_decoder_get_abi_arch (dctx) == SFRAME_ABI_S390X_ENDIAN_BIG) if (!err && sframe_decoder_get_abi_arch (dctx) == SFRAME_ABI_S390X_ENDIAN_BIG)
offset = SFRAME_V2_S390X_CFA_OFFSET_DECODE (offset); offset = SFRAME_V2_S390X_CFA_OFFSET_DECODE (offset);
if (errp)
*errp = err;
return offset; return offset;
} }