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ld: aarch64: make EH Frame parsing aware of augmentation char 'G'

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As per the DWARF for the Arm 64-bit Architecture (AArch64)
specification, the augmentation char 'G' indicates that associated
frames may modify MTE tags on the stack space they use.

Add knowledge of the 'G' augmentation char to the EH Frame parsing
code.

ChangeLog:

        * bfd/elf-eh-frame.c (_bfd_elf_parse_eh_frame): Accommodate
	augmentation char 'G'.
        * ld/testsuite/ld-aarch64/aarch64-elf.exp: New test.
        * ld/testsuite/ld-aarch64/mte-tagged-frame-bar.s: New test.
        * ld/testsuite/ld-aarch64/mte-tagged-frame-foo.s: New test.
        * ld/testsuite/ld-aarch64/mte-tagged-frame.d: New test.
This commit is contained in:
Indu Bhagat
2025-07-12 11:08:06 +02:00
committed by Jose E. Marchesi
parent 4c043ef6f3
commit 427363b461
5 changed files with 71 additions and 0 deletions
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1
bfd/elf-eh-frame.c
View File

@@ -802,6 +802,7 @@ _bfd_elf_parse_eh_frame (bfd *abfd, struct bfd_link_info *info,
switch (*aug++)
{
case 'B':
case 'G':
if (abfd->arch_info->arch != bfd_arch_aarch64)
goto unrecognized;
break;

2
ld/testsuite/ld-aarch64/aarch64-elf.exp
View File

@@ -376,6 +376,8 @@ run_dump_test_lp64 "variant_pcs-r"
run_dump_test_lp64 "variant_pcs-shared"
run_dump_test_lp64 "variant_pcs-now"
run_dump_test_lp64 "mte-tagged-frame"
set aarch64elflinktests {
{"ld-aarch64/so with global symbol" "-shared" "" "" {copy-reloc-so.s}
{} "copy-reloc-so.so"}

17
ld/testsuite/ld-aarch64/mte-tagged-frame-bar.s Normal file
View File

@@ -0,0 +1,17 @@
.text
.global bar
.type bar, %function
bar:
.cfi_startproc
.cfi_mte_tagged_frame
stp x19, x20, [sp, -144]!
.cfi_def_cfa_offset 144
.cfi_offset 19, -144
.cfi_offset 20, -136
ldp x19, x20, [sp], 144
.cfi_restore 20
.cfi_restore 19
.cfi_def_cfa_offset 0
ret
.cfi_endproc
.size bar, .-bar

16
ld/testsuite/ld-aarch64/mte-tagged-frame-foo.s Normal file
View File

@@ -0,0 +1,16 @@
.text
.global foo
.type foo, %function
foo:
.cfi_startproc
stp x19, x20, [sp, -32]!
.cfi_def_cfa_offset 32
.cfi_offset 19, -32
.cfi_offset 20, -16
ldp x19, x20, [sp], 32
.cfi_restore 20
.cfi_restore 19
.cfi_def_cfa_offset 0
ret
.cfi_endproc
.size foo, .-foo

35
ld/testsuite/ld-aarch64/mte-tagged-frame.d Normal file
View File

@@ -0,0 +1,35 @@
#source: mte-tagged-frame-foo.s
#source: mte-tagged-frame-bar.s
#ld: -shared
#objdump: -Wf
#name: MTE tagged EH Frame FDE
#...
Contents of the .eh_frame section:
00000000 0000000000000010 00000000 CIE
Version: 1
Augmentation: "zR"
Code alignment factor: 4
Data alignment factor: -8
Return address column: 30
Augmentation data: 1b
DW_CFA_def_cfa: r31 \(sp\) ofs 0
00000014 0000000000000020 00000018 FDE cie=00000000 pc=[a-f0-9]+\.\.[a-f0-9]+
#...
00000038 0000000000000014 00000000 CIE
Version: 1
Augmentation: "zRG"
Code alignment factor: 4
Data alignment factor: -8
Return address column: 30
Augmentation data: 1b
DW_CFA_def_cfa: r31 \(sp\) ofs 0
DW_CFA_nop
DW_CFA_nop
DW_CFA_nop
00000050 000000000000001c 0000001c FDE cie=00000038 pc=[a-f0-9]+\.\.[a-f0-9]+
#...