longjmp.s (915B)
1 /* Copyright 2011-2012 Nicholas J. Kain, licensed under standard MIT license */ 2 3 .section ".text.rt.longjmp","ax" 4 .global rt.longjmp 5 .type rt.longjmp,@function 6 rt.longjmp: 7 /* no endbr64 here to avoid exploitation - this function cannot be the 8 * result of an indirect branch. 9 */ 10 xor %eax,%eax 11 cmp $1,%esi /* CF = val ? 0 : 1 */ 12 adc %esi,%eax /* eax = val + !val */ 13 mov (%rdi),%rbx /* rdi is the jmp_buf, restore regs from it */ 14 mov 8(%rdi),%rbp 15 mov 16(%rdi),%r12 16 mov 24(%rdi),%r13 17 mov 32(%rdi),%r14 18 mov 40(%rdi),%r15 19 mov 48(%rdi),%rsp 20 /* IBT: we cannot directly jump to the saved adress since this might be 21 * in the middle of the function where we are not going to have an 22 * endbr64. instead, we push the address to the stack and return to it 23 * in order to avoid an indirect branch. 24 */ 25 push 56(%rdi) /* goto saved address without altering rsp */ 26 ret