* eh static data
@ 2023-03-10 4:15 Alan Modra
0 siblings, 0 replies; only message in thread
From: Alan Modra @ 2023-03-10 4:15 UTC (permalink / raw)
To: binutils
Fix another case of oss-fuzz tripping over gas static state,
ie. starting over testing another input file with rubbish left
uncleared in bss. size_end_sym pointed at garbage.
* ehopt.c (get_cie_info): Delete forward declaration.
(struct frame_data): Move to file scope.
(frame): New static, packaged..
(check_eh_frame): ..eh_frame_data and debug_frame_data.
(eh_begin): New function.
* as.c (gas_init): Call eh_begin.
* as.h (eh_begin): Declare.
diff --git a/gas/as.c b/gas/as.c
index 62f32fc865a..a18438c2542 100644
--- a/gas/as.c
+++ b/gas/as.c
@@ -1328,6 +1328,7 @@ gas_init (void)
read_begin ();
input_scrub_begin ();
expr_begin ();
+ eh_begin ();
int macro_strip_at = 0;
#ifdef TC_I960
diff --git a/gas/as.h b/gas/as.h
index 4c5fa9ecf7d..4d3a71410ff 100644
--- a/gas/as.h
+++ b/gas/as.h
@@ -538,6 +538,7 @@ int check_eh_frame (struct expressionS *, unsigned int *);
int eh_frame_estimate_size_before_relax (fragS *);
int eh_frame_relax_frag (fragS *);
void eh_frame_convert_frag (fragS *);
+void eh_begin (void);
int generic_force_reloc (struct fix *);
/* SFrame FRE optimization. */
diff --git a/gas/ehopt.c b/gas/ehopt.c
index 268554d89a7..feea61b9223 100644
--- a/gas/ehopt.c
+++ b/gas/ehopt.c
@@ -94,8 +94,6 @@ struct cie_info
int z_augmentation;
};
-static int get_cie_info (struct cie_info *);
-
/* Extract information from the CIE. */
static int
@@ -238,6 +236,27 @@ enum frame_state
state_error,
};
+struct frame_data
+{
+ enum frame_state state;
+
+ int cie_info_ok;
+ struct cie_info cie_info;
+
+ symbolS *size_end_sym;
+ fragS *loc4_frag;
+ int loc4_fix;
+
+ int aug_size;
+ int aug_shift;
+};
+
+static struct eh_state
+{
+ struct frame_data eh_data;
+ struct frame_data debug_data;
+} frame;
+
/* This function is called from emit_expr. It looks for cases which
we can optimize.
@@ -254,23 +273,6 @@ enum frame_state
int
check_eh_frame (expressionS *exp, unsigned int *pnbytes)
{
- struct frame_data
- {
- enum frame_state state;
-
- int cie_info_ok;
- struct cie_info cie_info;
-
- symbolS *size_end_sym;
- fragS *loc4_frag;
- int loc4_fix;
-
- int aug_size;
- int aug_shift;
- };
-
- static struct frame_data eh_frame_data;
- static struct frame_data debug_frame_data;
struct frame_data *d;
/* Don't optimize. */
@@ -285,9 +287,9 @@ check_eh_frame (expressionS *exp, unsigned int *pnbytes)
/* Select the proper section data. */
if (startswith (segment_name (now_seg), ".eh_frame")
&& segment_name (now_seg)[9] != '_')
- d = &eh_frame_data;
+ d = &frame.eh_data;
else if (startswith (segment_name (now_seg), ".debug_frame"))
- d = &debug_frame_data;
+ d = &frame.debug_data;
else
return 0;
@@ -570,3 +572,9 @@ eh_frame_convert_frag (fragS *frag)
frag->fr_subtype = 0;
frag->fr_offset = 0;
}
+
+void
+eh_begin (void)
+{
+ memset (&frame, 0, sizeof (frame));
+}
--
Alan Modra
Australia Development Lab, IBM
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