diff options
Diffstat (limited to 'arch/x86/entry/entry_64.S')
| -rw-r--r-- | arch/x86/entry/entry_64.S | 79 |
1 files changed, 1 insertions, 78 deletions
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index f1c8f15..f7050a5 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -253,7 +253,6 @@ tracesys: * the value it wants us to use in the table lookup. */ RESTORE_C_REGS_EXCEPT_RAX - RESTORE_EXTRA_REGS #if __SYSCALL_MASK == ~0 cmpq $__NR_syscall_max, %rax #else @@ -264,6 +263,7 @@ tracesys: movq %r10, %rcx /* fixup for C */ call *sys_call_table(, %rax, 8) movq %rax, RAX(%rsp) + RESTORE_EXTRA_REGS 1: /* Use IRET because user could have changed pt_regs->foo */ @@ -384,83 +384,6 @@ END(ptregs_\func) #define __SYSCALL_64(nr, sym, qual) __SYSCALL_64_QUAL_##qual(sym) #include <asm/syscalls_64.h> - .macro FORK_LIKE func -ENTRY(stub_\func) - SAVE_EXTRA_REGS 8 - jmp sys_\func -END(stub_\func) - .endm - - FORK_LIKE clone - FORK_LIKE fork - FORK_LIKE vfork - -ENTRY(stub_execve) - call sys_execve -return_from_execve: - testl %eax, %eax - jz 1f - /* exec failed, can use fast SYSRET code path in this case */ - ret -1: - /* must use IRET code path (pt_regs->cs may have changed) */ - addq $8, %rsp - ZERO_EXTRA_REGS - movq %rax, RAX(%rsp) - jmp int_ret_from_sys_call -END(stub_execve) -/* - * Remaining execve stubs are only 7 bytes long. - * ENTRY() often aligns to 16 bytes, which in this case has no benefits. - */ - .align 8 -GLOBAL(stub_execveat) - call sys_execveat - jmp return_from_execve -END(stub_execveat) - -#if defined(CONFIG_X86_X32_ABI) - .align 8 -GLOBAL(stub_x32_execve) - call compat_sys_execve - jmp return_from_execve -END(stub_x32_execve) - .align 8 -GLOBAL(stub_x32_execveat) - call compat_sys_execveat - jmp return_from_execve -END(stub_x32_execveat) -#endif - -/* - * sigreturn is special because it needs to restore all registers on return. - * This cannot be done with SYSRET, so use the IRET return path instead. - */ -ENTRY(stub_rt_sigreturn) - /* - * SAVE_EXTRA_REGS result is not normally needed: - * sigreturn overwrites all pt_regs->GPREGS. - * But sigreturn can fail (!), and there is no easy way to detect that. - * To make sure RESTORE_EXTRA_REGS doesn't restore garbage on error, - * we SAVE_EXTRA_REGS here. - */ - SAVE_EXTRA_REGS 8 - call sys_rt_sigreturn -return_from_stub: - addq $8, %rsp - RESTORE_EXTRA_REGS - movq %rax, RAX(%rsp) - jmp int_ret_from_sys_call -END(stub_rt_sigreturn) - -#ifdef CONFIG_X86_X32_ABI -ENTRY(stub_x32_rt_sigreturn) - SAVE_EXTRA_REGS 8 - call sys32_x32_rt_sigreturn - jmp return_from_stub -END(stub_x32_rt_sigreturn) -#endif - /* * A newly forked process directly context switches into this address. * |
