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Fix unwind info for some trivial functions

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While stack unwinding works with gdb here, the
function _Unwind_Backtrace gives up when something outside
.cfi_startproc/.cfi_endproc is found in the call stack, like
OPENSSL_cleanse, OPENSSL_atomic_add, OPENSSL_rdtsc, CRYPTO_memcmp
and other trivial functions which don't save anything in the stack.

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Kurt Roeckx <kurt@roeckx.be>
(Merged from https://github.com/openssl/openssl/pull/10635)
This commit is contained in:
Bernd Edlinger 2019-12-17 09:05:32 +01:00
parent f64f262204
commit 8913378a55
1 changed files with 16 additions and 0 deletions
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16
crypto/x86_64cpuid.pl
View file

@ -41,6 +41,7 @@ print<<___;
.type OPENSSL_atomic_add,\@abi-omnipotent
.align 16
OPENSSL_atomic_add:
.cfi_startproc
movl ($arg1),%eax
.Lspin: leaq ($arg2,%rax),%r8
.byte 0xf0 # lock
@ -49,16 +50,19 @@ OPENSSL_atomic_add:
movl %r8d,%eax
.byte 0x48,0x98 # cltq/cdqe
ret
.cfi_endproc
.size OPENSSL_atomic_add,.-OPENSSL_atomic_add
.globl OPENSSL_rdtsc
.type OPENSSL_rdtsc,\@abi-omnipotent
.align 16
OPENSSL_rdtsc:
.cfi_startproc
rdtsc
shl \$32,%rdx
or %rdx,%rax
ret
.cfi_endproc
.size OPENSSL_rdtsc,.-OPENSSL_rdtsc
.globl OPENSSL_ia32_cpuid
@ -234,6 +238,7 @@ OPENSSL_ia32_cpuid:
.type OPENSSL_cleanse,\@abi-omnipotent
.align 16
OPENSSL_cleanse:
.cfi_startproc
xor %rax,%rax
cmp \$15,$arg2
jae .Lot
@ -263,12 +268,14 @@ OPENSSL_cleanse:
cmp \$0,$arg2
jne .Little
ret
.cfi_endproc
.size OPENSSL_cleanse,.-OPENSSL_cleanse
.globl CRYPTO_memcmp
.type CRYPTO_memcmp,\@abi-omnipotent
.align 16
CRYPTO_memcmp:
.cfi_startproc
xor %rax,%rax
xor %r10,%r10
cmp \$0,$arg3
@ -297,6 +304,7 @@ CRYPTO_memcmp:
shr \$63,%rax
.Lno_data:
ret
.cfi_endproc
.size CRYPTO_memcmp,.-CRYPTO_memcmp
___
@ -305,6 +313,7 @@ print<<___ if (!$win64);
.type OPENSSL_wipe_cpu,\@abi-omnipotent
.align 16
OPENSSL_wipe_cpu:
.cfi_startproc
pxor %xmm0,%xmm0
pxor %xmm1,%xmm1
pxor %xmm2,%xmm2
@ -331,6 +340,7 @@ OPENSSL_wipe_cpu:
xorq %r11,%r11
leaq 8(%rsp),%rax
ret
.cfi_endproc
.size OPENSSL_wipe_cpu,.-OPENSSL_wipe_cpu
___
print<<___ if ($win64);
@ -367,6 +377,7 @@ print<<___;
.type OPENSSL_instrument_bus,\@abi-omnipotent
.align 16
OPENSSL_instrument_bus:
.cfi_startproc
mov $arg1,$out # tribute to Win64
mov $arg2,$cnt
mov $arg2,$max
@ -393,12 +404,14 @@ OPENSSL_instrument_bus:
mov $max,%rax
ret
.cfi_endproc
.size OPENSSL_instrument_bus,.-OPENSSL_instrument_bus
.globl OPENSSL_instrument_bus2
.type OPENSSL_instrument_bus2,\@abi-omnipotent
.align 16
OPENSSL_instrument_bus2:
.cfi_startproc
mov $arg1,$out # tribute to Win64
mov $arg2,$cnt
mov $arg3,$max
@ -441,6 +454,7 @@ OPENSSL_instrument_bus2:
mov $redzone(%rsp),%rax
sub $cnt,%rax
ret
.cfi_endproc
.size OPENSSL_instrument_bus2,.-OPENSSL_instrument_bus2
___
}
@ -452,6 +466,7 @@ print<<___;
.type OPENSSL_ia32_${rdop}_bytes,\@abi-omnipotent
.align 16
OPENSSL_ia32_${rdop}_bytes:
.cfi_startproc
xor %rax, %rax # return value
cmp \$0,$arg2
je .Ldone_${rdop}_bytes
@ -488,6 +503,7 @@ OPENSSL_ia32_${rdop}_bytes:
.Ldone_${rdop}_bytes:
xor %r10,%r10 # Clear sensitive data from register
ret
.cfi_endproc
.size OPENSSL_ia32_${rdop}_bytes,.-OPENSSL_ia32_${rdop}_bytes
___
}