/* * this is the internal transfer function. * * HISTORY * 3-May-13 Ralf Schmitt * Add support for strange GCC caller-save decisions * (ported from switch_aarch64_gcc.h) * 19-Aug-11 Alexey Borzenkov * Correctly save ebp, ebx and cw * 07-Sep-05 (py-dev mailing list discussion) * removed 'ebx' from the register-saved. !!!! WARNING !!!! * It means that this file can no longer be compiled statically! * It is now only suitable as part of a dynamic library! * 24-Nov-02 Christian Tismer * 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 * 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 * slightly changed framework for spark * 31-Avr-02 Armin Rigo * Added ebx, esi and edi register-saves. * 01-Mar-02 Samual M. Rushing * 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 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5) # define ATTR_NOCLONE __attribute__((noclone)) #else # define ATTR_NOCLONE #endif static int slp_switch(void) { int err; #ifdef _WIN32 void *seh; #endif void *ebp, *ebx; unsigned short cw; int *stackref, stsizediff; __asm__ volatile ("" : : : "esi", "edi"); __asm__ volatile ("fstcw %0" : "=m" (cw)); __asm__ volatile ("movl %%ebp, %0" : "=m" (ebp)); __asm__ volatile ("movl %%ebx, %0" : "=m" (ebx)); #ifdef _WIN32 __asm__ volatile ( "movl %%fs:0x0, %%eax\n" "movl %%eax, %0\n" : "=m" (seh) : : "eax"); #endif __asm__ ("movl %%esp, %0" : "=g" (stackref)); { SLP_SAVE_STATE(stackref, stsizediff); __asm__ volatile ( "addl %0, %%esp\n" "addl %0, %%ebp\n" : : "r" (stsizediff) ); SLP_RESTORE_STATE(); __asm__ volatile ("xorl %%eax, %%eax" : "=a" (err)); } #ifdef _WIN32 __asm__ volatile ( "movl %0, %%eax\n" "movl %%eax, %%fs:0x0\n" : : "m" (seh) : "eax"); #endif __asm__ volatile ("movl %0, %%ebx" : : "m" (ebx)); __asm__ volatile ("movl %0, %%ebp" : : "m" (ebp)); __asm__ volatile ("fldcw %0" : : "m" (cw)); __asm__ volatile ("" : : : "esi", "edi"); 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. */