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amd64 sigtramp: comment-out annotations for registers with DWARF number >= 32

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Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Konstantin Belousov 2022-01-02 20:39:07 +02:00
parent f1e7a532d1
commit 642f77be1d
1 changed files with 5 additions and 2 deletions
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7
sys/amd64/amd64/sigtramp.S
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@ -67,6 +67,9 @@ ENTRY(__vdso_sigcode)
* Clang IAS + ld.lld combination cannot handle any of the segment
* registers. Also, clang IAS does not know %rflags/%fs.base/%gs.base
* registers names, use dwarf registers numbers from psABI directly.
*
* LLVM libunwind from stable/13 cannot parse register numbers higher
* than 32. Disable %rflags, %fs.base, and %gs.base annotations.
*/
.cfi_offset %fs, SIGF_UC + UC_FS
.cfi_offset %gs, SIGF_UC + UC_GS
@ -76,14 +79,14 @@ ENTRY(__vdso_sigcode)
.cfi_offset %rip, SIGF_UC + UC_RIP
#if 0
.cfi_offset %cs, SIGF_UC + UC_CS
#endif
.cfi_offset 49 /* %rflags */, SIGF_UC + UC_RFLAGS
#endif
.cfi_offset %rsp, SIGF_UC + UC_RSP
#if 0
.cfi_offset %ss, SIGF_UC + UC_SS
#endif
.cfi_offset 58 /* %fs.base */, SIGF_UC + UC_FSBASE
.cfi_offset 59 /* %gs.base */, SIGF_UC + UC_GSBASE
#endif
call *SIGF_HANDLER(%rsp) /* call signal handler */
lea SIGF_UC(%rsp),%rdi /* get ucontext_t */
pushq $0 /* junk to fake return addr. */