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ARCv2: save r30 on kernel entry as gcc uses it for code-gen

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commit ecd43afdbe72017aefe48080631eb625e177ef4d upstream.

This is not exposed to userspace debugers yet, which can be done
independently as a seperate patch !

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vineet Gupta 2017-01-08 19:45:48 -08:00 • committed by Greg Kroah-Hartman
parent 82a0d8aabe
commit 1aefe328a6
2 changed files with 3 additions and 1 deletions
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2
arch/arc/include/asm/entry-arcv2.h
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@ -16,6 +16,7 @@
;
; Now manually save: r12, sp, fp, gp, r25
PUSH r30
PUSH r12
; Saving pt_regs->sp correctly requires some extra work due to the way
@ -72,6 +73,7 @@
POPAX AUX_USER_SP
1:
POP r12
POP r30
.endm

2
arch/arc/include/asm/ptrace.h
View file

@ -84,7 +84,7 @@ struct pt_regs {
unsigned long fp;
unsigned long sp; /* user/kernel sp depending on where we came from */
unsigned long r12;
unsigned long r12, r30;
/*------- Below list auto saved by h/w -----------*/
unsigned long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11;