Jens Remus jremus@linux.ibm.com
Thu Feb 22 16:01:20 GMT 2024

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---

Do not generate SFrame FDE if DWARF CFI directives .cfi_def_cfa or
.cfi_def_cfa_register specify a base register number other than the
architecture-specific stack-pointer (SP) or frame-pointer (FP)
register numbers.

This also causes the assembler to print a warning message, so that
skipping of the SFrame FDE does not occur silently.

gas/
	* gen-sframe.c: Skip SFrame generation if CFI specifies
	  non-FP/SP base register.

Reviewed-by: Andreas Krebbel <krebbel@linux.ibm.com>
Signed-off-by: Jens Remus <jremus@linux.ibm.com>
---

Notes (jremus):
    Without this patch the assembler would erroneously generate bad SFrame
    information for the s390-specific SFrame error test cases 1 and 2, that
    get introduced by patch "s390: Initial support to generate .sframe from
    CFI directives in assembler".

 gas/gen-sframe.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/gas/gen-sframe.c b/gas/gen-sframe.c
index d35baaac54b2..1269b2b77c54 100644
--- a/gas/gen-sframe.c
+++ b/gas/gen-sframe.c
@@ -986,7 +986,11 @@ sframe_xlate_do_def_cfa (struct sframe_xlate_ctx *xlate_ctx,
 			       get_dw_fde_start_addrS (xlate_ctx->dw_fde));
   }
   /* Define the current CFA rule to use the provided register and
-     offset.  */
+     offset.  However, if the register is not FP/SP, skip creating
+     SFrame stack trace info for the function.  */
+  if (cfi_insn->u.r != SFRAME_CFA_SP_REG
+      && cfi_insn->u.r != SFRAME_CFA_FP_REG)
+    return SFRAME_XLATE_ERR_NOTREPRESENTED; /* Not represented.  */
   sframe_fre_set_cfa_base_reg (cur_fre, cfi_insn->u.ri.reg);
   sframe_fre_set_cfa_offset (cur_fre, cfi_insn->u.ri.offset);
   cur_fre->merge_candidate = false;
@@ -1004,9 +1008,14 @@ sframe_xlate_do_def_cfa_register (struct sframe_xlate_ctx *xlate_ctx,
   struct sframe_row_entry *last_fre = xlate_ctx->last_fre;
   /* Get the scratchpad FRE.  This FRE will eventually get linked in.  */
   struct sframe_row_entry *cur_fre = xlate_ctx->cur_fre;
+
   gas_assert (cur_fre);
   /* Define the current CFA rule to use the provided register (but to
-     keep the old offset).  */
+     keep the old offset).  However, if the register is not FP/SP,
+     skip creating SFrame stack trace info for the function.  */
+  if (cfi_insn->u.r != SFRAME_CFA_SP_REG
+      && cfi_insn->u.r != SFRAME_CFA_FP_REG)
+    return SFRAME_XLATE_ERR_NOTREPRESENTED; /* Not represented.  */
   sframe_fre_set_cfa_base_reg (cur_fre, cfi_insn->u.ri.reg);
   sframe_fre_set_cfa_offset (cur_fre, last_fre->cfa_offset);
   cur_fre->merge_candidate = false;
-- 
2.40.1

---

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