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x86/entry/64: Move non entry code into .text section

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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
This commit is contained in:
Thomas Gleixner 2020-03-25 19:45:26 +01:00
parent fba8dbeaf3
commit b9f6976bfb
2 changed files with 15 additions and 5 deletions
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18
arch/x86/entry/entry_64.S
View File

@ -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

2
arch/x86/kernel/ftrace_64.S
View File

@ -12,7 +12,7 @@
#include <asm/frame.h>
.code64
.section .entry.text, "ax"
.section .text, "ax"
#ifdef CONFIG_FRAME_POINTER
/* Save parent and function stack frames (rip and rbp) */