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[ELF] Support .cfi_signal_frame

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glibc/sysdeps/unix/sysv/linux/x86_64/sigaction.c libc.a(sigaction.o) has a CIE
with the augmentation string "zRS". Support 'S' to allow --icf={safe,all}.
This commit is contained in:
Fangrui Song 2020-08-07 22:08:00 -07:00
parent 754e09f9ce
commit d30d461938
3 changed files with 18 additions and 20 deletions
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19
lld/ELF/EhFrame.cpp
View File

@ -188,19 +188,14 @@ uint8_t EhReader::getFdeEncoding() {
for (char c : aug) {
if (c == 'R')
return readByte();
if (c == 'z') {
if (c == 'z')
skipLeb128();
continue;
}
if (c == 'P') {
skipAugP();
continue;
}
if (c == 'L') {
else if (c == 'L')
readByte();
continue;
}
failOn(aug.data(), "unknown .eh_frame augmentation string: " + aug);
else if (c == 'P')
skipAugP();
else if (c != 'S')
failOn(aug.data(), "unknown .eh_frame augmentation string: " + aug);
}
return DW_EH_PE_absptr;
}
@ -216,7 +211,7 @@ bool EhReader::hasLSDA() {
skipAugP();
else if (c == 'R')
readByte();
else
else if (c != 'S')
failOn(aug.data(), "unknown .eh_frame augmentation string: " + aug);
}
return false;

18
lld/test/ELF/eh-frame-value-format7.s
View File

@ -22,7 +22,7 @@
# CHECK-NEXT: EntrySize: 0
# CHECK-NEXT: SectionData (
# CHECK-NEXT: 0000: 011B033B 10000000 01000000 30F2FFFF
# CHECK-NEXT: 0010: 24000000
# CHECK-NEXT: 0010: 2C000000
# Header (always 4 bytes): 011B033B
# 10000000 = .eh_frame(0x2018) - .eh_frame_hdr(0x2004) - 4
# 01000000 = 1 = the number of FDE pointers in the table.
@ -43,10 +43,11 @@
# CHECK-NEXT: AddressAlignment:
# CHECK-NEXT: EntrySize:
# CHECK-NEXT: SectionData (
# CHECK-NEXT: 0000: 0C000000 00000000 01520001 010102FF
# CHECK-NEXT: 0010: 0C000000 14000000 34120000 00000000
# ^
# ---> ADDR(foo) + 0x234 = 0x1234
# CHECK-NEXT: 0000: 14000000 00000000 01525300 01010102
# CHECK-NEXT: 0010: FF000000 00000000 0C000000 1C000000
# CHECK-NEXT: 0020: 34120000 00000000 00000000
# ^
# ---> ADDR(foo) + 0x234 = 0x1234
.text
.global foo
@ -54,11 +55,12 @@ foo:
nop
.section .eh_frame,"a",@unwind
.long 12 # Size
.long 13 # Size
.long 0x00 # ID
.byte 0x01 # Version.
.byte 0x52 # Augmentation string: 'R','\0'
.byte 0x52 # Augmentation string: 'R','S','\0'
.byte 0x53
.byte 0x00
.byte 0x01
@ -71,5 +73,5 @@ foo:
.byte 0xFF
.long 0x6 # Size
.long 0x14 # ID
.long 0x15 # ID
.short foo + 0x234

1
lld/test/ELF/icf-eh-frame.s
View File

@ -29,6 +29,7 @@ _Z1bv:
.section .text.Z1cv,"ax",@progbits
_Z1cv:
.cfi_startproc
.cfi_signal_frame
ret
.cfi_endproc