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x86/entry/32: 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: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200505134340.320164650@linutronix.de
This commit is contained in:
Thomas Gleixner 2020-03-25 19:47:40 +01:00
parent b9f6976bfb
commit 8c0fa8a036
1 changed files with 9 additions and 0 deletions
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9
arch/x86/entry/entry_32.S
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@ -730,6 +730,7 @@
* %eax: prev task
* %edx: next task
*/
.pushsection .text, "ax"
SYM_CODE_START(__switch_to_asm)
/*
* Save callee-saved registers
@ -776,6 +777,7 @@ SYM_CODE_START(__switch_to_asm)
jmp __switch_to
SYM_CODE_END(__switch_to_asm)
.popsection
/*
* The unwinder expects the last frame on the stack to always be at the same
@ -784,6 +786,7 @@ SYM_CODE_END(__switch_to_asm)
* asmlinkage function so its argument has to be pushed on the stack. This
* wrapper creates a proper "end of stack" frame header before the call.
*/
.pushsection .text, "ax"
SYM_FUNC_START(schedule_tail_wrapper)
FRAME_BEGIN
@ -794,6 +797,8 @@ SYM_FUNC_START(schedule_tail_wrapper)
FRAME_END
ret
SYM_FUNC_END(schedule_tail_wrapper)
.popsection
/*
* A newly forked process directly context switches into this address.
*
@ -801,6 +806,7 @@ SYM_FUNC_END(schedule_tail_wrapper)
* ebx: kernel thread func (NULL for user thread)
* edi: kernel thread arg
*/
.pushsection .text, "ax"
SYM_CODE_START(ret_from_fork)
call schedule_tail_wrapper
@ -825,6 +831,7 @@ SYM_CODE_START(ret_from_fork)
movl $0, PT_EAX(%esp)
jmp 2b
SYM_CODE_END(ret_from_fork)
.popsection
/*
* Return to user mode is not as complex as all this looks,
@ -1691,6 +1698,7 @@ SYM_CODE_START(general_protection)
jmp common_exception
SYM_CODE_END(general_protection)
.pushsection .text, "ax"
SYM_CODE_START(rewind_stack_do_exit)
/* Prevent any naive code from trying to unwind to our caller. */
xorl %ebp, %ebp
@ -1701,3 +1709,4 @@ SYM_CODE_START(rewind_stack_do_exit)
call do_exit
1: jmp 1b
SYM_CODE_END(rewind_stack_do_exit)
.popsection