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x86/entry/32: 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: 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