Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-08 05:01:48 +00:00
Code Issues Packages Projects Releases Wiki Activity

powerpc: Move branch instruction from ACCOUNT_CPU_USER_ENTRY to caller

Browse Source 
[PATCH 1/6] powerpc: Move branch instruction from ACCOUNT_CPU_USER_ENTRY to caller

The first instruction in ACCOUNT_CPU_USER_ENTRY is 'beq' which checks for
exceptions coming from kernel mode. PPR value will be saved immediately after
ACCOUNT_CPU_USER_ENTRY and is also for user level exceptions. So moved this
branch instruction in the caller code.

Signed-off-by: Haren Myneni <haren@us.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Haren Myneni 2012-12-06 21:46:37 +00:00 committed by Benjamin Herrenschmidt
parent 15fab56eca
commit 5d75b26443
4 changed files with 6 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/powerpc/include/asm/exception-64s.h
View File

@ -224,8 +224,9 @@ do_kvm_##n: \
std r10,0(r1); /* make stack chain pointer */ \
std r0,GPR0(r1); /* save r0 in stackframe */ \
std r10,GPR1(r1); /* save r1 in stackframe */ \
beq 4f; /* if from kernel mode */ \
ACCOUNT_CPU_USER_ENTRY(r9, r10); \
std r2,GPR2(r1); /* save r2 in stackframe */ \
4: std r2,GPR2(r1); /* save r2 in stackframe */ \
SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \
SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \
ld r9,area+EX_R9(r13); /* move r9, r10 to stackframe */ \

2
arch/powerpc/include/asm/ppc_asm.h
View File

@ -30,7 +30,6 @@
#define ACCOUNT_STOLEN_TIME
#else
#define ACCOUNT_CPU_USER_ENTRY(ra, rb) \
beq 2f; /* if from kernel mode */ \
MFTB(ra); /* get timebase */ \
ld rb,PACA_STARTTIME_USER(r13); \
std ra,PACA_STARTTIME(r13); \
@ -38,7 +37,6 @@
ld ra,PACA_USER_TIME(r13); \
add ra,ra,rb; /* add on to user time */ \
std ra,PACA_USER_TIME(r13); \
2:
#define ACCOUNT_CPU_USER_EXIT(ra, rb) \
MFTB(ra); /* get timebase */ \

3
arch/powerpc/kernel/entry_64.S
View File

@ -62,8 +62,9 @@ system_call_common:
std r12,_MSR(r1)
std r0,GPR0(r1)
std r10,GPR1(r1)
beq 2f /* if from kernel mode */
ACCOUNT_CPU_USER_ENTRY(r10, r11)
std r2,GPR2(r1)
2: std r2,GPR2(r1)
std r3,GPR3(r1)
mfcr r2
std r4,GPR4(r1)

3
arch/powerpc/kernel/exceptions-64e.S
View File

@ -159,8 +159,9 @@ exc_##n##_common: \
std r9,GPR9(r1); /* save r9 in stackframe */ \
std r10,_NIP(r1); /* save SRR0 to stackframe */ \
std r11,_MSR(r1); /* save SRR1 to stackframe */ \
beq 2f; /* if from kernel mode */ \
ACCOUNT_CPU_USER_ENTRY(r10,r11);/* accounting (uses cr0+eq) */ \
ld r3,excf+EX_R10(r13); /* get back r10 */ \
2: ld r3,excf+EX_R10(r13); /* get back r10 */ \
ld r4,excf+EX_R11(r13); /* get back r11 */ \
mfspr r5,SPRN_SPRG_GEN_SCRATCH;/* get back r13 */ \
std r12,GPR12(r1); /* save r12 in stackframe */ \