FYI
I just discovered a potential gcc bug which causes kvm-userspace builds
to break.
I looks like it happens only with the latest fedora rawhide gcc 4.4
https://bugzilla.redhat.com/show_bug.cgi?id=489753
The following patch circumvents this problem by just renaming R to REG.
People facing the same problem might find this patch useful.
diff --git a/user/test/x86/apic.c b/user/test/x86/apic.c
index 9c6205b..ec3777c 100644
--- a/user/test/x86/apic.c
+++ b/user/test/x86/apic.c
@@ -35,9 +35,9 @@ typedef struct {
} isr_regs_t;
#ifdef __x86_64__
-# define R "r"
+# define REG "r"
#else
-# define R "e"
+# define REG "e"
#endif
extern char isr_entry_point[];
@@ -54,14 +54,14 @@ asm (
"push %r9 \n\t"
"push %r8 \n\t"
#endif
- "push %"R"di \n\t"
- "push %"R"si \n\t"
- "push %"R"bp \n\t"
- "push %"R"sp \n\t"
- "push %"R"bx \n\t"
- "push %"R"dx \n\t"
- "push %"R"cx \n\t"
- "push %"R"ax \n\t"
+ "push %"REG"di \n\t"
+ "push %"REG"si \n\t"
+ "push %"REG"bp \n\t"
+ "push %"REG"sp \n\t"
+ "push %"REG"bx \n\t"
+ "push %"REG"dx \n\t"
+ "push %"REG"cx \n\t"
+ "push %"REG"ax \n\t"
#ifdef __x86_64__
"mov %rsp, %rdi \n\t"
"callq *8*16(%rsp) \n\t"
@@ -70,14 +70,14 @@ asm (
"calll *4+4*8(%esp) \n\t"
"add $4, %esp \n\t"
#endif
- "pop %"R"ax \n\t"
- "pop %"R"cx \n\t"
- "pop %"R"dx \n\t"
- "pop %"R"bx \n\t"
- "pop %"R"bp \n\t"
- "pop %"R"bp \n\t"
- "pop %"R"si \n\t"
- "pop %"R"di \n\t"
+ "pop %"REG"ax \n\t"
+ "pop %"REG"cx \n\t"
+ "pop %"REG"dx \n\t"
+ "pop %"REG"bx \n\t"
+ "pop %"REG"bp \n\t"
+ "pop %"REG"bp \n\t"
+ "pop %"REG"si \n\t"
+ "pop %"REG"di \n\t"
#ifdef __x86_64__
"pop %r8 \n\t"
"pop %r9 \n\t"
diff --git a/user/test/x86/vmexit.c b/user/test/x86/vmexit.c
index bd57bfa..bc81be9 100644
--- a/user/test/x86/vmexit.c
+++ b/user/test/x86/vmexit.c
@@ -19,9 +19,9 @@ static inline unsigned long long rdtsc()
#define N (1 << 22)
#ifdef __x86_64__
-# define R "r"
+# define REG "r"
#else
-# define R "e"
+# define REG "e"
#endif
int main()
@@ -31,7 +31,7 @@ int main()
t1 = rdtsc();
for (i = 0; i < N; ++i)
- asm volatile ("push %%"R"bx; cpuid; pop %%"R"bx"
+ asm volatile ("push %%"REG"bx; cpuid; pop %%"REG"bx"
: : : "eax", "ecx", "edx");
t2 = rdtsc();
printf("vmexit latency: %d\n", (int)((t2 - t1) / N));
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