60 lines
1.7 KiB
C++
60 lines
1.7 KiB
C++
#include <ucontext.h>
|
|
|
|
namespace factor {
|
|
|
|
/* glibc lies about the contents of the fpstate the kernel provides, hiding the
|
|
FXSR environment */
|
|
struct _fpstate {
|
|
/* Regular FPU environment */
|
|
unsigned long cw;
|
|
unsigned long sw;
|
|
unsigned long tag;
|
|
unsigned long ipoff;
|
|
unsigned long cssel;
|
|
unsigned long dataoff;
|
|
unsigned long datasel;
|
|
struct _fpreg _st[8];
|
|
unsigned short status;
|
|
unsigned short magic; /* 0xffff = regular FPU data only */
|
|
|
|
/* FXSR FPU environment */
|
|
unsigned long _fxsr_env[6]; /* FXSR FPU env is ignored */
|
|
unsigned long mxcsr;
|
|
unsigned long reserved;
|
|
struct _fpxreg _fxsr_st[8]; /* FXSR FPU reg data is ignored */
|
|
struct _xmmreg _xmm[8];
|
|
unsigned long padding[56];
|
|
};
|
|
|
|
#define X86_FXSR_MAGIC 0x0000
|
|
|
|
inline static unsigned int uap_fpu_status(void* uap) {
|
|
ucontext_t* ucontext = (ucontext_t*)uap;
|
|
struct _fpstate* fpregs = (struct _fpstate*)ucontext->uc_mcontext.fpregs;
|
|
if (fpregs->magic == X86_FXSR_MAGIC)
|
|
return fpregs->sw | fpregs->mxcsr;
|
|
else
|
|
return fpregs->sw;
|
|
}
|
|
|
|
inline static void uap_clear_fpu_status(void* uap) {
|
|
ucontext_t* ucontext = (ucontext_t*)uap;
|
|
struct _fpstate* fpregs = (struct _fpstate*)ucontext->uc_mcontext.fpregs;
|
|
fpregs->sw = 0;
|
|
if (fpregs->magic == X86_FXSR_MAGIC)
|
|
fpregs->mxcsr &= 0xffffffc0;
|
|
}
|
|
|
|
#define UAP_STACK_POINTER(ucontext) \
|
|
(((ucontext_t*)ucontext)->uc_mcontext.gregs[7])
|
|
#define UAP_PROGRAM_COUNTER(ucontext) \
|
|
(((ucontext_t*)ucontext)->uc_mcontext.gregs[14])
|
|
#define UAP_SET_TOC_POINTER(uap, ptr) (void)0
|
|
|
|
#define CODE_TO_FUNCTION_POINTER(code) (void)0
|
|
#define CODE_TO_FUNCTION_POINTER_CALLBACK(vm, code) (void)0
|
|
#define FUNCTION_CODE_POINTER(ptr) ptr
|
|
#define FUNCTION_TOC_POINTER(ptr) ptr
|
|
|
|
}
|