1 /* 2 * arch/i386/setjmp.S 3 * 4 * setjmp/longjmp for the i386 architecture 5 * 6 * 7 * 8 * The jmp_buf is assumed to contain the following, in order: 9 * %ebx 10 * %esp 11 * %ebp 12 * %esi 13 * %edi 14 * <return address> 15 */ 16 /* 17 .text 18 .align 4 19 20 .globl _setjmp 21 .type _setjmp, @function 22 _setjmp: # gcc 4.0.1 wants this as an alias? 23 24 .globl setjmp 25 .type setjmp, @function 26 setjmp: 27 #ifdef REGPARM 28 movl %eax,%edx 29 #else 30 movl 4(%esp),%edx 31 #endif 32 popl %ecx # Return address, and adjust the stack 33 xorl %eax,%eax # Return value 34 movl %ebx,(%edx) 35 movl %esp,4(%edx) # Post-return %esp! 36 pushl %ecx # Make the call/return stack happy 37 movl %ebp,8(%edx) 38 movl %esi,12(%edx) 39 movl %edi,16(%edx) 40 movl %ecx,20(%edx) # Return address 41 ret 42 43 .size setjmp,.-setjmp 44 45 .text 46 .align 4 47 .globl longjmp 48 .type longjmp, @function 49 longjmp: 50 #ifdef REGPARM 51 xchgl %eax,%edx 52 #else 53 movl 4(%esp),%edx # jmp_ptr address 54 movl 8(%esp),%eax # Return value 55 #endif 56 movl (%edx),%ebx 57 movl 4(%edx),%esp 58 movl 8(%edx),%ebp 59 movl 12(%edx),%esi 60 movl 16(%edx),%edi 61 jmp *20(%edx) 62 63 .size longjmp,.-longjmp 64 */ 65 #if __SIZEOF_POINTER__ == 4 66 #include <i386/setjmp.S> 67 #elif __SIZEOF_POINTER__ == 8 68 #include <x86_64/setjmp.S> 69 #else 70 #error "Unable to build for to-be-defined architecture type" 71 #endif 72 73
