ref: b176e0b29eb6c4ec753c6a4f8953e1fa62abc09a
parent: 28ef34f8826557109fd2bf2b68cab9fc6bffde24
author: Ori Bernstein <[email protected]>
date: Sun Sep 14 22:28:27 EDT 2014
Add missing file abort.s
This contains the code for dying out of memory. W00t string
formatting in assembly!
--- /dev/null
+++ b/rt/abort.s
@@ -1,0 +1,41 @@
+.text
+
+.globl _rt$abort_oob
+.globl __rt$abort_oob
+_rt$abort_oob:
+__rt$abort_oob:
+ /* format pc */
+ movq (%rsp),%rax
+ movq $15,%rdx
+.loop:
+ movq %rax, %rcx
+ andq $0xf, %rcx
+ movb .digitchars(%rcx),%r8b
+ movb %r8b,.pcstr(%rdx)
+ subq $1, %rdx
+ shrq $4, %rax
+ jnz .loop
+ /* write abort message */
+ movq $1, %rax /* write(fd=%rdi, msg=%rsi, len=%rdx) */
+ movq $2, %rdi /* fd */
+ movq $.msg, %rsi /* msg */
+ movq $(.msgend-.msg), %rdx /* length */
+ syscall
+ /* kill self */
+ movq $39,%rax /* getpid */
+ syscall
+ movq %rax, %rdi /* save pid */
+ movq $62, %rax /* kill(pid=%rdi, sig=%rsi) */
+ movq $6, %rsi /* kill(pid=%rdi, sig=%rsi) */
+ syscall
+.data
+.msg: /* pc name: */
+ .byte '0','x'
+.pcstr:
+ .byte '0','0','0','0','0','0','0','0'
+ .byte '0','0','0','0','0','0','0','0'
+ .ascii ": out of bounds access\n"
+.msgend:
+
+.digitchars:
+ .ascii "0123456789abcdef"