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| author | Vineet Gupta <vgupta@synopsys.com> | 2013-05-27 21:43:41 +0530 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2013-06-22 19:23:22 +0530 |
| commit | 16f9afe651e8197fb7ce6df0990d8e2ad779e1af (patch) | |
| tree | c6482028a0ceced44e7e4819f7741c2fd8084e3e /arch/arc/include/asm/entry.h | |
| parent | 2fa919045b72ec892e17d56f888e6af4260b7629 (diff) | |
| download | linux-16f9afe651e8197fb7ce6df0990d8e2ad779e1af.tar.bz2 | |
ARC: pt_regs update #3: Remove unused gutter at start of callee_regs
This is trickier than prev two:
* context switching code saves kernel mode callee regs in the format of
struct callee_regs thus needs adjustment. This also reduces the height
of topmost kernel stack frame by 1 word.
* Since kernel stack unwinder is sensitive to height of topmost kernel
stack frame, that needs a word of adjustment too.
ptrace needs a bit of updating since pt_regs now diverges from
user_regs_struct.
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/include/asm/entry.h')
| -rw-r--r-- | arch/arc/include/asm/entry.h | 14 |
1 files changed, 3 insertions, 11 deletions
diff --git a/arch/arc/include/asm/entry.h b/arch/arc/include/asm/entry.h index 5ff7b8dd3d5b..820202af21a5 100644 --- a/arch/arc/include/asm/entry.h +++ b/arch/arc/include/asm/entry.h @@ -124,8 +124,6 @@ st.a r25, [sp, -4] #endif - /* move up by 1 word to "create" callee_regs->"stack_place_holder" */ - sub sp, sp, 4 .endm /*-------------------------------------------------------------- @@ -148,10 +146,9 @@ st.a r23, [sp, -4] st.a r24, [sp, -4] #ifdef CONFIG_ARC_CURR_IN_REG - sub sp, sp, 8 + sub sp, sp, 4 #else st.a r25, [sp, -4] - sub sp, sp, 4 #endif .endm @@ -168,14 +165,11 @@ *-------------------------------------------------------------*/ .macro RESTORE_CALLEE_SAVED_KERNEL - #ifdef CONFIG_ARC_CURR_IN_REG - add sp, sp, 8 /* skip callee_reg gutter and user r25 placeholder */ + add sp, sp, 4 /* skip usual r25 placeholder */ #else - add sp, sp, 4 /* skip "callee_regs->stack_place_holder" */ ld.ab r25, [sp, 4] #endif - ld.ab r24, [sp, 4] ld.ab r23, [sp, 4] ld.ab r22, [sp, 4] @@ -203,8 +197,6 @@ *-------------------------------------------------------------*/ .macro RESTORE_CALLEE_SAVED_USER - add sp, sp, 4 /* skip "callee_regs->stack_place_holder" */ - #ifdef CONFIG_ARC_CURR_IN_REG ld.ab r12, [sp, 4] st r12, [r25, TASK_THREAD + THREAD_USER_R25] @@ -230,7 +222,7 @@ * Super FAST Restore callee saved regs by simply re-adjusting SP *-------------------------------------------------------------*/ .macro DISCARD_CALLEE_SAVED_USER - add sp, sp, 14 * 4 + add sp, sp, SZ_CALLEE_REGS .endm /*-------------------------------------------------------------- |