From eca2411040c1ee15b8882c6427fb4eb5a48ada69 Mon Sep 17 00:00:00 2001 From: Christophe Leroy Date: Mon, 8 Feb 2021 15:10:21 +0000 Subject: powerpc/32: Always enable data translation on syscall entry If the code can use a stack in vm area, it can also use a stack in linear space. Simplify code by removing old non VMAP stack code on PPC32 in syscall. That means the data translation is now re-enabled early in syscall entry in all cases, not only when using VMAP stacks. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/412c6c1786922d991bbb89c2ad2e82cffe8ab112.1612796617.git.christophe.leroy@csgroup.eu --- arch/powerpc/kernel/head_32.h | 23 +---------------------- 1 file changed, 1 insertion(+), 22 deletions(-) (limited to 'arch/powerpc/kernel/head_32.h') diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h index abc7b603ab65..d481e351f006 100644 --- a/arch/powerpc/kernel/head_32.h +++ b/arch/powerpc/kernel/head_32.h @@ -118,7 +118,6 @@ .macro SYSCALL_ENTRY trapno mfspr r12,SPRN_SPRG_THREAD mfspr r9, SPRN_SRR1 -#ifdef CONFIG_VMAP_STACK mfspr r11, SPRN_SRR0 mtctr r11 andi. r11, r9, MSR_PR @@ -126,30 +125,16 @@ lwz r1,TASK_STACK-THREAD(r12) beq- 99f addi r1, r1, THREAD_SIZE - INT_FRAME_SIZE - li r10, MSR_KERNEL & ~(MSR_IR | MSR_RI) /* can take DTLB miss */ + LOAD_REG_IMMEDIATE(r10, MSR_KERNEL & ~(MSR_IR | MSR_RI)) /* can take DTLB miss */ mtmsr r10 isync tovirt(r12, r12) stw r11,GPR1(r1) stw r11,0(r1) mr r11, r1 -#else - andi. r11, r9, MSR_PR - lwz r11,TASK_STACK-THREAD(r12) - beq- 99f - addi r11, r11, THREAD_SIZE - INT_FRAME_SIZE - tophys(r11, r11) - stw r1,GPR1(r11) - stw r1,0(r11) - tovirt(r1, r11) /* set new kernel sp */ -#endif mflr r10 stw r10, _LINK(r11) -#ifdef CONFIG_VMAP_STACK mfctr r10 -#else - mfspr r10,SPRN_SRR0 -#endif stw r10,_NIP(r11) mfcr r10 rlwinm r10,r10,0,4,2 /* Clear SO bit in CR */ @@ -157,11 +142,7 @@ #ifdef CONFIG_40x rlwinm r9,r9,0,14,12 /* clear MSR_WE (necessary?) */ #else -#ifdef CONFIG_VMAP_STACK LOAD_REG_IMMEDIATE(r10, MSR_KERNEL & ~MSR_IR) /* can take exceptions */ -#else - LOAD_REG_IMMEDIATE(r10, MSR_KERNEL & ~(MSR_IR|MSR_DR)) /* can take exceptions */ -#endif mtmsr r10 /* (except for mach check in rtas) */ #endif lis r10,STACK_FRAME_REGS_MARKER@ha /* exception frame marker */ @@ -190,7 +171,6 @@ li r12,-1 /* clear all pending debug events */ mtspr SPRN_DBSR,r12 lis r11,global_dbcr0@ha - tophys(r11,r11) addi r11,r11,global_dbcr0@l lwz r12,0(r11) mtspr SPRN_DBCR0,r12 @@ -200,7 +180,6 @@ #endif 3: - tovirt_novmstack r2, r2 /* set r2 to current */ lis r11, transfer_to_syscall@h ori r11, r11, transfer_to_syscall@l #ifdef CONFIG_TRACE_IRQFLAGS -- cgit