AlkantarClanX12
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/*
* this is the internal transfer function.
*
* HISTORY
* 3-May-13 Ralf Schmitt <ralf@systemexit.de>
* Add support for strange GCC caller-save decisions
* (ported from switch_aarch64_gcc.h)
* 18-Aug-11 Alexey Borzenkov <snaury@gmail.com>
* Correctly save rbp, csr and cw
* 01-Apr-04 Hye-Shik Chang <perky@FreeBSD.org>
* Ported from i386 to amd64.
* 24-Nov-02 Christian Tismer <tismer@tismer.com>
* needed to add another magic constant to insure
* that f in slp_eval_frame(PyFrameObject *f)
* STACK_REFPLUS will probably be 1 in most cases.
* gets included into the saved stack area.
* 17-Sep-02 Christian Tismer <tismer@tismer.com>
* after virtualizing stack save/restore, the
* stack size shrunk a bit. Needed to introduce
* an adjustment STACK_MAGIC per platform.
* 15-Sep-02 Gerd Woetzel <gerd.woetzel@GMD.DE>
* slightly changed framework for spark
* 31-Avr-02 Armin Rigo <arigo@ulb.ac.be>
* Added ebx, esi and edi register-saves.
* 01-Mar-02 Samual M. Rushing <rushing@ironport.com>
* Ported from i386.
*/
#define STACK_REFPLUS 1
#ifdef SLP_EVAL
/* #define STACK_MAGIC 3 */
/* the above works fine with gcc 2.96, but 2.95.3 wants this */
#define STACK_MAGIC 0
#define REGS_TO_SAVE "r12", "r13", "r14", "r15"
static int
slp_switch(void)
{
int err;
void* rbp;
void* rbx;
unsigned int csr;
unsigned short cw;
/* This used to be declared 'register', but that does nothing in
modern compilers and is explicitly forbidden in some new
standards. */
long *stackref, stsizediff;
__asm__ volatile ("" : : : REGS_TO_SAVE);
__asm__ volatile ("fstcw %0" : "=m" (cw));
__asm__ volatile ("stmxcsr %0" : "=m" (csr));
__asm__ volatile ("movq %%rbp, %0" : "=m" (rbp));
__asm__ volatile ("movq %%rbx, %0" : "=m" (rbx));
__asm__ ("movq %%rsp, %0" : "=g" (stackref));
{
SLP_SAVE_STATE(stackref, stsizediff);
__asm__ volatile (
"addq %0, %%rsp\n"
"addq %0, %%rbp\n"
:
: "r" (stsizediff)
);
SLP_RESTORE_STATE();
__asm__ volatile ("xorq %%rax, %%rax" : "=a" (err));
}
__asm__ volatile ("movq %0, %%rbx" : : "m" (rbx));
__asm__ volatile ("movq %0, %%rbp" : : "m" (rbp));
__asm__ volatile ("ldmxcsr %0" : : "m" (csr));
__asm__ volatile ("fldcw %0" : : "m" (cw));
__asm__ volatile ("" : : : REGS_TO_SAVE);
return err;
}
#endif
/*
* further self-processing support
*/
/*
* if you want to add self-inspection tools, place them
* here. See the x86_msvc for the necessary defines.
* These features are highly experimental und not
* essential yet.
*/