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63 lines (52 sloc) 1.783 kB
#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
#define UAP_STACK_POINTER_TYPE greg_t
}
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