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| author | Peter Zijlstra <peterz@infradead.org> | 2022-03-14 20:07:30 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-03-15 12:32:45 +0300 |
| commit | 3515899bef545fc5b5f6b865e080bfe4c9a92a41 (patch) | |
| tree | 27a104d2cf194454c7f418fe6a616eec992b4439 /arch/x86/entry | |
| parent | dca5da2abe406168b85f97e22109710ebe0bda08 (diff) | |
| download | linux-3515899bef545fc5b5f6b865e080bfe4c9a92a41.tar.xz | |
x86: Annotate idtentry_df()
Without CONFIG_X86_ESPFIX64 exc_double_fault() is noreturn and objtool
is clever enough to figure that out.
vmlinux.o: warning: objtool: asm_exc_double_fault()+0x22: unreachable instruction
0000000000001260 <asm_exc_double_fault>:
1260: f3 0f 1e fa endbr64
1264: 90 nop
1265: 90 nop
1266: 90 nop
1267: e8 84 03 00 00 call 15f0 <paranoid_entry>
126c: 48 89 e7 mov %rsp,%rdi
126f: 48 8b 74 24 78 mov 0x78(%rsp),%rsi
1274: 48 c7 44 24 78 ff ff ff ff movq $0xffffffffffffffff,0x78(%rsp)
127d: e8 00 00 00 00 call 1282 <asm_exc_double_fault+0x22> 127e: R_X86_64_PLT32 exc_double_fault-0x4
1282: e9 09 04 00 00 jmp 1690 <paranoid_exit>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/Yi9gOW9f1GGwwUD6@hirez.programming.kicks-ass.net
Diffstat (limited to 'arch/x86/entry')
| -rw-r--r-- | arch/x86/entry/entry_64.S | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 6e5399104abd..4faac48ebec5 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -551,6 +551,9 @@ SYM_CODE_START(\asmsym) movq $-1, ORIG_RAX(%rsp) /* no syscall to restart */ call \cfunc + /* For some configurations \cfunc ends up being a noreturn. */ + REACHABLE + jmp paranoid_exit _ASM_NOKPROBE(\asmsym) |