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libsframe: stop search for SFrame FRE if its start IP is greater than PC

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The SFrame FREs for an SFrame FDE are sorted on their start address.
Therefore the linear search for a matching SFrame FRE can be stopped,
if its start address is greater than the searched for PC.

libsframe/
	* sframe.c (sframe_find_fre): Stop search if FRE's start IP is
	greater than PC.

Signed-off-by: Jens Remus <jremus@linux.ibm.com>
This commit is contained in:
Jens Remus
2025-05-26 11:02:29 -07:00
committed by Indu Bhagat
parent 9d2a24349e
commit ada5c6fa08
1 changed files with 3 additions and 6 deletions
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9
libsframe/sframe.c
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@@ -1096,14 +1096,13 @@ sframe_find_fre (sframe_decoder_ctx *ctx, int32_t pc,
{
sframe_frame_row_entry cur_fre;
sframe_func_desc_entry *fdep;
uint32_t fre_type, fde_type, i;
uint32_t fre_type, i;
int32_t start_ip_offset;
int32_t func_start_addr;
int32_t end_ip_offset;
const char *fres;
size_t size = 0;
int err = 0;
bool mask_p;
if ((ctx == NULL) || (frep == NULL))
return sframe_set_errno (&err, SFRAME_ERR_INVAL);
@@ -1114,8 +1113,6 @@ sframe_find_fre (sframe_decoder_ctx *ctx, int32_t pc,
return sframe_set_errno (&err, SFRAME_ERR_DCTX_INVAL);
fre_type = sframe_get_fre_type (fdep);
fde_type = sframe_get_fde_type (fdep);
mask_p = (fde_type == SFRAME_FDE_TYPE_PCMASK);
fres = ctx->sfd_fres + fdep->sfde_func_start_fre_off;
func_start_addr = fdep->sfde_func_start_address;
@@ -1129,8 +1126,8 @@ sframe_find_fre (sframe_decoder_ctx *ctx, int32_t pc,
start_ip_offset = cur_fre.fre_start_addr;
end_ip_offset = sframe_fre_get_end_ip_offset (fdep, i, fres + size);
/* First FRE's start_ip must be more than pc for regular SFrame FDEs. */
if (i == 0 && !mask_p && (start_ip_offset + func_start_addr) > pc)
/* Stop search if FRE's start_ip is greater than pc. */
if ((start_ip_offset + func_start_addr) > pc)
return sframe_set_errno (&err, SFRAME_ERR_FRE_INVAL);
if (sframe_fre_check_range_p (fdep, start_ip_offset, end_ip_offset, pc))