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| /*
| * 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;
| register 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
|
|
