diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2020-03-25 19:45:26 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-06-11 15:14:37 +0200 |
| commit | b9f6976bfb949121bb6e1e6f4fd9909735729148 (patch) | |
| tree | 86fa2279b062c6452c79e1c5c8c1591425fff703 /arch/x86/entry | |
| parent | fba8dbeaf30e2c8db2c2cfeb38f6dbffcbf86bba (diff) | |
x86/entry/64: Move non entry code into .text section
All ASM code which is not part of the entry functionality can move out into
the .text section. No reason to keep it in the non-instrumentable entry
section.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200505134340.227579223@linutronix.de
Diffstat (limited to 'arch/x86/entry')
| -rw-r--r-- | arch/x86/entry/entry_64.S | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index a15b70ac87b5..b199f43cff28 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -279,6 +279,7 @@ SYM_CODE_END(entry_SYSCALL_64) * %rdi: prev task * %rsi: next task */ +.pushsection .text, "ax" SYM_FUNC_START(__switch_to_asm) /* * Save callee-saved registers @@ -321,6 +322,7 @@ SYM_FUNC_START(__switch_to_asm) jmp __switch_to SYM_FUNC_END(__switch_to_asm) +.popsection /* * A newly forked process directly context switches into this address. @@ -329,6 +331,7 @@ SYM_FUNC_END(__switch_to_asm) * rbx: kernel thread func (NULL for user thread) * r12: kernel thread arg */ +.pushsection .text, "ax" SYM_CODE_START(ret_from_fork) UNWIND_HINT_EMPTY movq %rax, %rdi @@ -357,6 +360,7 @@ SYM_CODE_START(ret_from_fork) movq $0, RAX(%rsp) jmp 2b SYM_CODE_END(ret_from_fork) +.popsection /* * Build the entry stubs with some assembler magic. @@ -1037,10 +1041,12 @@ idtentry alignment_check do_alignment_check has_error_code=1 idtentry simd_coprocessor_error do_simd_coprocessor_error has_error_code=0 - /* - * Reload gs selector with exception handling - * edi: new selector - */ +/* + * Reload gs selector with exception handling + * edi: new selector + * + * Is in entry.text as it shouldn't be instrumented. + */ SYM_FUNC_START(native_load_gs_index) FRAME_BEGIN pushfq @@ -1076,6 +1082,7 @@ SYM_CODE_END(.Lbad_gs) .previous /* Call softirq on interrupt stack. Interrupts are off. */ +.pushsection .text, "ax" SYM_FUNC_START(do_softirq_own_stack) pushq %rbp mov %rsp, %rbp @@ -1085,6 +1092,7 @@ SYM_FUNC_START(do_softirq_own_stack) leaveq ret SYM_FUNC_END(do_softirq_own_stack) +.popsection #ifdef CONFIG_XEN_PV idtentry hypervisor_callback xen_do_hypervisor_callback has_error_code=0 @@ -1728,6 +1736,7 @@ SYM_CODE_START(ignore_sysret) SYM_CODE_END(ignore_sysret) #endif +.pushsection .text, "ax" SYM_CODE_START(rewind_stack_do_exit) UNWIND_HINT_FUNC /* Prevent any naive code from trying to unwind to our caller. */ @@ -1739,3 +1748,4 @@ SYM_CODE_START(rewind_stack_do_exit) call do_exit SYM_CODE_END(rewind_stack_do_exit) +.popsection |