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Merge "Fix x86_64 check for signal handler." am: 36991d8e26

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Original change: https://android-review.googlesource.com/c/platform/system/core/+/1430216

Change-Id: I0ae001f62832c13e41b88c9ee2e708f8e9d479ae
This commit is contained in:
Christopher Ferris 2020-09-18 18:33:26 +00:00 • committed by Automerger Merge Worker
commit 0a8f898eee
1 changed files with 2 additions and 3 deletions
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5
libunwindstack/RegsX86_64.cpp
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@ -141,15 +141,14 @@ bool RegsX86_64::StepIfSignalHandler(uint64_t elf_offset, Elf* elf, Memory* proc
return false;
}
uint16_t data2;
if (!elf_memory->ReadFully(elf_offset + 8, &data2, sizeof(data2)) || data2 != 0x0f05) {
uint8_t data2;
if (!elf_memory->ReadFully(elf_offset + 8, &data2, sizeof(data2)) || data2 != 0x05) {
return false;
}
// __restore_rt:
// 0x48 0xc7 0xc0 0x0f 0x00 0x00 0x00 mov $0xf,%rax
// 0x0f 0x05 syscall
// 0x0f nopl 0x0($rax)
// Read the mcontext data from the stack.
// sp points to the ucontext data structure, read only the mcontext part.