| .hidden __sysinfo |
| |
| # We do some gymnastics here to pretend that a call to __syscall |
| # Is actually a call into the __sysinfo function. As they have |
| # the same type we really just want to do a jmp, but need to |
| # do the lookup in a way that supports PIC and not clobber |
| # any registers |
| |
| .global __syscall |
| .hidden __syscall |
| .type __syscall,@function |
| __syscall: |
| subq $8, %rsp # Reserve space for tail call |
| pushq %rax # Save RAX |
| call 1f # Determine our IP |
| 1: movq (%rsp),%rax |
| addq $[__sysinfo-1b],%rax |
| mov (%eax),%rax |
| test %rax,%rax |
| jz 2f |
| movq %rax, 16(%rsp) # Put this in space we reserved |
| addq $8, %rsp # Junk our IP |
| popq %rax # Restore eax |
| ret # Tail call |
| 2: addq $8, %rsp |
| popq %rax |
| addq $8, %rsp |
| int $128 |
| ret |
