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Fix cmpxchgl writeback to rax.

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Fix lahf/sahf for 64-bit
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Merge tag 'pull-x86-20221115' of https://gitlab.com/rth7680/qemu into staging

Fix cmpxchgl writeback to rax.
Fix lahf/sahf for 64-bit

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* tag 'pull-x86-20221115' of https://gitlab.com/rth7680/qemu:
  target/i386: hardcode R_EAX as destination register for LAHF/SAHF
  target/i386: fix cmpxchg with 32-bit register destination

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2022-11-15 09:32:17 -05:00
commit dd64bcea00
3 changed files with 101 additions and 28 deletions
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1
tests/tcg/x86_64/Makefile.target
View file

@ -11,6 +11,7 @@ include $(SRC_PATH)/tests/tcg/i386/Makefile.target
ifeq ($(filter %-linux-user, $(TARGET)),$(TARGET))
X86_64_TESTS += vsyscall
X86_64_TESTS += noexec
X86_64_TESTS += cmpxchg
TESTS=$(MULTIARCH_TESTS) $(X86_64_TESTS) test-x86_64
else
TESTS=$(MULTIARCH_TESTS)

42
tests/tcg/x86_64/cmpxchg.c Normal file
View file

@ -0,0 +1,42 @@
#include <assert.h>
static int mem;
static unsigned long test_cmpxchgb(unsigned long orig)
{
unsigned long ret;
mem = orig;
asm("cmpxchgb %b[cmp],%[mem]"
: [ mem ] "+m"(mem), [ rax ] "=a"(ret)
: [ cmp ] "r"(0x77), "a"(orig));
return ret;
}
static unsigned long test_cmpxchgw(unsigned long orig)
{
unsigned long ret;
mem = orig;
asm("cmpxchgw %w[cmp],%[mem]"
: [ mem ] "+m"(mem), [ rax ] "=a"(ret)
: [ cmp ] "r"(0x7777), "a"(orig));
return ret;
}
static unsigned long test_cmpxchgl(unsigned long orig)
{
unsigned long ret;
mem = orig;
asm("cmpxchgl %[cmp],%[mem]"
: [ mem ] "+m"(mem), [ rax ] "=a"(ret)
: [ cmp ] "r"(0x77777777u), "a"(orig));
return ret;
}
int main()
{
unsigned long test = 0xdeadbeef12345678ull;
assert(test == test_cmpxchgb(test));
assert(test == test_cmpxchgw(test));
assert(test == test_cmpxchgl(test));
return 0;
}