ulib setjmp() and longjmp()

2025-10-18 10:01:57 +02:00
parent e1a850a8f8
commit 76faf0581d
4 changed files with 63 additions and 0 deletions
--- a/ulib/jump/jump.S
+++ b/ulib/jump/jump.S
@ -0,0 +1,33 @@
+// https://patchwork.ozlabs.org/project/uboot/patch/c315e41d155612260223ef75afa06bd728a3e705.1529433258.git.ivan.gorinov@intel.com/
+
+.global setjmp
+setjmp:
+  pop %rcx
+  movq %rcx, (%rdi)
+  movq %rsp, 8(%rdi)
+  movq %rbp, 16(%rdi)
+  movq %rbx, 24(%rdi)
+  movq %r12, 32(%rdi)
+  movq %r13, 40(%rdi)
+  movq %r14, 48(%rdi)
+  movq %r15, 56(%rdi)
+  xorq %rax, %rax
+  jmpq *%rcx
+
+.global longjmp
+longjmp:
+  movq (%rdi), %rcx
+  movq 8(%rdi), %rsp
+  movq 16(%rdi), %rbp
+  movq 24(%rdi), %rbx
+  movq 32(%rdi), %r12
+  movq 40(%rdi), %r13
+  movq 48(%rdi), %r14
+  movq 56(%rdi), %r15
+  
+  movq %rsi, %rax
+  testq %rax, %rax
+  jnz 1f
+  incq %rax
+1:
+  jmpq *%rcx