Your IP : 3.143.17.175
/*
* this is the internal transfer function.
*
* HISTORY
* 31-May-15 iOS support. Ported from arm32. Proton <feisuzhu@163.com>
*
* NOTES
*
* It is not possible to detect if fp is used or not, so the supplied
* switch function needs to support it, so that you can remove it if
* it does not apply to you.
*
* POSSIBLE ERRORS
*
* "fp cannot be used in asm here"
*
* - Try commenting out "fp" in REGS_TO_SAVE.
*
*/
#define STACK_REFPLUS 1
#ifdef SLP_EVAL
#define STACK_MAGIC 0
#define REG_SP "sp"
#define REG_SPSP "sp,sp"
#define REG_FP "r7"
#define REG_FPFP "r7,r7"
#define REGS_TO_SAVE_GENERAL "r4", "r5", "r6", "r8", "r10", "r11", "lr"
#define REGS_TO_SAVE REGS_TO_SAVE_GENERAL, "d8", "d9", "d10", "d11", \
"d12", "d13", "d14", "d15"
static int
#ifdef __GNUC__
__attribute__((optimize("no-omit-frame-pointer")))
#endif
slp_switch(void)
{
void *fp;
int *stackref, stsizediff, result;
__asm__ volatile ("" : : : REGS_TO_SAVE);
__asm__ volatile ("str " REG_FP ",%0" : "=m" (fp));
__asm__ ("mov %0," REG_SP : "=r" (stackref));
{
SLP_SAVE_STATE(stackref, stsizediff);
__asm__ volatile (
"add " REG_SPSP ",%0\n"
"add " REG_FPFP ",%0\n"
:
: "r" (stsizediff)
: REGS_TO_SAVE /* Clobber registers, force compiler to
* recalculate address of void *fp from REG_SP or REG_FP */
);
SLP_RESTORE_STATE();
}
__asm__ volatile (
"ldr " REG_FP ", %1\n\t"
"mov %0, #0"
: "=r" (result)
: "m" (fp)
: REGS_TO_SAVE /* Force compiler to restore saved registers after this */
);
return result;
}
#endif