[Bug libdw/29450] run-low_high_pc.sh fails on i386 against binutils-2.39
https://sourceware.org/bugzilla/show_bug.cgi?id=29450 --- Comment #3 from Sergei Trofimovich --- gas-2.39 started adding 0-sized DIE for function without a .size marking: $ cat crti.S.S .section .init,"ax",@progbits .p2align 2 .globl _init .hidden _init .type _init, @function _init: .section .text.__x86.get_pc_thunk.bx,"axG",@progbits,__x86.get_pc_thunk.bx,comdat .globl __x86.get_pc_thunk.bx .hidden __x86.get_pc_thunk.bx .p2align 4 .type __x86.get_pc_thunk.bx,@function __x86.get_pc_thunk.bx: ud2 .size __x86.get_pc_thunk.bx, . - __x86.get_pc_thunk.bx .previous ud2 $ as-2.39 --gdwarf2 --32 -o crti.o crti.S.S $ readelf -aW --debug-dump crti.o <0>: Abbrev Number: 1 (DW_TAG_compile_unit) DW_AT_stmt_list : (data4) 0x0 <10> DW_AT_ranges : (data4) 0x0 <14> DW_AT_name: (strp) (offset: 0x0): crti.S.S <18> DW_AT_comp_dir: (strp) (offset: 0x9): /home/slyfox/dev/bugs/binutils-2.39-crti-size/delta <1c> DW_AT_producer: (strp) (offset: 0x3d): GNU AS 2.39 <20> DW_AT_language: (data2) 32769(MIPS assembler) <1><22>: Abbrev Number: 2 (DW_TAG_subprogram) <23> DW_AT_name: (strp) (offset: 0x49): _init <27> DW_AT_external: (flag) 1 <28> DW_AT_low_pc : (addr) 0x0 <2c> DW_AT_high_pc : (addr) 0x0 <1><30>: Abbrev Number: 2 (DW_TAG_subprogram) <31> DW_AT_name: (strp) (offset: 0x4f): __x86.get_pc_thunk.bx <35> DW_AT_external: (flag) 1 <36> DW_AT_low_pc : (addr) 0x0 <3a> DW_AT_high_pc : (addr) 0x2 <1><3e>: Abbrev Number: 0 $ as-2.38 --gdwarf2 --32 -o crti.o crti.S.S $ readelf -aW --debug-dump crti.o <0>: Abbrev Number: 1 (DW_TAG_compile_unit) DW_AT_stmt_list : (data4) 0x0 <10> DW_AT_ranges : (data4) 0x0 <14> DW_AT_name: (strp) (offset: 0x0): crti.S.S <18> DW_AT_comp_dir: (strp) (offset: 0x9): /home/slyfox/dev/bugs/binutils-2.39-crti-size/delta <1c> DW_AT_producer: (strp) (offset: 0x3d): GNU AS 2.38 <20> DW_AT_language: (data2) 32769(MIPS assembler) Not sure if it's a discrepancy in binutils. -- You are receiving this mail because: You are on the CC list for the bug.
[Bug libdw/29450] run-low_high_pc.sh fails on i386 against binutils-2.39
https://sourceware.org/bugzilla/show_bug.cgi?id=29450 --- Comment #4 from Sergei Trofimovich --- Filed https://sourceware.org/PR29451 against gas. -- You are receiving this mail because: You are on the CC list for the bug.
[Bug libdw/29450] run-low_high_pc.sh fails on i386 against binutils-2.39
https://sourceware.org/bugzilla/show_bug.cgi?id=29450 Sergei Trofimovich changed: What|Removed |Added See Also||https://sourceware.org/bugz ||illa/show_bug.cgi?id=29451 -- You are receiving this mail because: You are on the CC list for the bug.
[PATCH] tests: do not fail on zero sized DIEs (binutils-2.39 compatible)
binutils started producing 0-sized DIEs on functions interspersed
by nested sections (".section ...; .previous). This led to
run-low_high_pc.sh failure in form of:
FAIL: run-low_high_pc.sh
[b] main.c
[2d] main
[b] ../sysdeps/i386/start.S
[26] _start
[40] ../sysdeps/x86/abi-note.c
[b52] init.c
[b8e] static-reloc.c
[2dba] _dl_relocate_static_pie
[2dd8] ../sysdeps/i386/crti.S
[2def] _init
lowpc: 8049000, highpc: 8049000lx
../sysdeps/i386/crti.S: [2def] '_init' highpc <= lowpc
FAIL run-low_high_pc.sh (exit status: 255)
To work it around let's allow lowpc == highpc special case.
https://sourceware.org/bugzilla/show_bug.cgi?id=29450
Signed-off-by: Sergei Trofimovich
---
tests/ChangeLog | 4
tests/low_high_pc.c | 3 +++
2 files changed, 7 insertions(+)
diff --git a/tests/ChangeLog b/tests/ChangeLog
index 0c6f68ef..8296e0b6 100644
--- a/tests/ChangeLog
+++ b/tests/ChangeLog
@@ -1,3 +1,7 @@
+2022-08-04 Sergei Trofimovich
+
+ * low_high_pc.c (handle_die): Allow zero sized DIEs for binutils-2.39.
+
2022-08-01 Mark Wielaard
* run-debuginfod-percent-escape.sh: Add initial scan wait_ready.
diff --git a/tests/low_high_pc.c b/tests/low_high_pc.c
index cd022b1c..80c83b6d 100644
--- a/tests/low_high_pc.c
+++ b/tests/low_high_pc.c
@@ -70,6 +70,9 @@ handle_die (Dwarf_Die *die, void *arg)
if (dwarf_hasattr (die, DW_AT_low_pc)
&& dwarf_hasattr (die, DW_AT_high_pc)
&& highpc <= lowpc
+ /* gas-2.39 produces zero sized DIEs sometimes:
+ https://sourceware.org/PR29451. */
+ && highpc != lowpc
&& ! (dwarf_tag (die) == DW_TAG_compile_unit && highpc == lowpc))
{
printf("lowpc: %" PRIx64 ", highpc: %" PRIx64 "\n", lowpc, highpc);
--
2.37.1
[PATCH] tests: run-low_high_pc.sh: drop redundant 'lx' suffix
Noticed when debugged test failure:
lowpc: 8049000, highpc: 8049000lx
../sysdeps/i386/crti.S: [2def] '_init' highpc <= lowpc
Signed-off-by: Sergei Trofimovich
---
tests/ChangeLog | 4
tests/low_high_pc.c | 2 +-
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/tests/ChangeLog b/tests/ChangeLog
index 0c6f68ef..d2952cc9 100644
--- a/tests/ChangeLog
+++ b/tests/ChangeLog
@@ -1,3 +1,7 @@
+2022-08-04 Sergei Trofimovich
+
+ * low_high_pc.c (handle_die): Drop redundant 'lx' suffix.
+
2022-08-01 Mark Wielaard
* run-debuginfod-percent-escape.sh: Add initial scan wait_ready.
diff --git a/tests/low_high_pc.c b/tests/low_high_pc.c
index 78b6ad08..cd022b1c 100644
--- a/tests/low_high_pc.c
+++ b/tests/low_high_pc.c
@@ -72,7 +72,7 @@ handle_die (Dwarf_Die *die, void *arg)
&& highpc <= lowpc
&& ! (dwarf_tag (die) == DW_TAG_compile_unit && highpc == lowpc))
{
- printf("lowpc: %" PRIx64 ", highpc: %" PRIx64 "lx\n", lowpc, highpc);
+ printf("lowpc: %" PRIx64 ", highpc: %" PRIx64 "\n", lowpc, highpc);
fail (off, name, "highpc <= lowpc");
}
--
2.37.1
