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Save/restore full rbx on 64-bit VxWorks.

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This commit is contained in:
Andrey Semashev
2018-08-13 20:22:12 +03:00
parent 050309a40b
commit 8418a749ea
1 changed files with 12 additions and 0 deletions
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12
src/dump.cpp
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@@ -195,6 +195,17 @@ private:
#if (defined(__i386__) || defined(__VXWORKS__)) && (defined(__PIC__) || defined(__PIE__)) && !(defined(__clang__) || (defined(BOOST_GCC) && BOOST_GCC >= 50100))
// Unless the compiler can do it automatically, we have to backup ebx in 32-bit PIC/PIE code because it is reserved by the ABI.
// For VxWorks ebx is reserved on 64-bit as well.
#if defined(__x86_64__)
uint64_t rbx = ebx;
__asm__ __volatile__
(
"xchgq %%rbx, %0\n\t"
"cpuid\n\t"
"xchgq %%rbx, %0\n\t"
: "+DS" (rbx), "+a" (eax), "+c" (ecx), "+d" (edx)
);
ebx = static_cast< uint32_t >(rbx);
#else // defined(__x86_64__)
__asm__ __volatile__
(
"xchgl %%ebx, %0\n\t"
@@ -202,6 +213,7 @@ private:
"xchgl %%ebx, %0\n\t"
: "+DS" (ebx), "+a" (eax), "+c" (ecx), "+d" (edx)
);
#endif // defined(__x86_64__)
#else
__asm__ __volatile__
(