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powerpc/32: Set regs parameter in r3 in transfer_to_handler
authorChristophe Leroy <christophe.leroy@csgroup.eu>
Fri, 12 Mar 2021 12:50:36 +0000 (12:50 +0000)
committerMichael Ellerman <mpe@ellerman.id.au>
Mon, 29 Mar 2021 02:22:08 +0000 (13:22 +1100)
All exception handlers take regs as first parameter.

Instead of setting r3 just before each call to a handler, set
it in transfer_to_handler.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/f994a379bb895a2cbd518cb82460ad3f3d3ccdf5.1615552867.git.christophe.leroy@csgroup.eu
arch/powerpc/kernel/entry_32.S patch | blob | history
arch/powerpc/kernel/head_32.h patch | blob | history
arch/powerpc/kernel/head_40x.S patch | blob | history
arch/powerpc/kernel/head_8xx.S patch | blob | history
arch/powerpc/kernel/head_book3s_32.S patch | blob | history
arch/powerpc/kernel/head_booke.h patch | blob | history
arch/powerpc/kernel/head_fsl_booke.S patch | blob | history

diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 1e201fc4a590cdfc59fb5e4a3667102eecae3105..e538ae73394d925bc2e0c3bf75a0a158327db8c2 100644 (file)
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -87,6 +87,7 @@ _ASM_NOKPROBE_SYMBOL(transfer_to_handler_full)
        .globl  transfer_to_handler
 transfer_to_handler:
        SAVE_NVGPRS(r11)
+       addi    r3,r1,STACK_FRAME_OVERHEAD
        stw     r2,GPR2(r11)
        stw     r12,_NIP(r11)
        stw     r9,_MSR(r11)
@@ -227,7 +228,6 @@ ret_from_kernel_thread:
  */
        .globl  handle_page_fault
 handle_page_fault:
-       addi    r3,r1,STACK_FRAME_OVERHEAD
        bl      do_page_fault
        cmpwi   r3,0
        beq+    ret_from_except
@@ -365,7 +365,6 @@ _ASM_NOKPROBE_SYMBOL(fast_exception_return)
 3:
        li      r10,-1
        stw     r10,_TRAP(r11)
-       addi    r3,r1,STACK_FRAME_OVERHEAD
        bl      transfer_to_handler_full
        bl      unrecoverable_exception
        trap    /* should not get here */
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index 087445e4548979ea2190d5a9824050d454b1fb8c..4d638d760a96eb5b1b3576e165e293948d211208 100644 (file)
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h
@@ -183,7 +183,6 @@ label:
 #define EXCEPTION(n, label, hdlr, xfer)                \
        START_EXCEPTION(n, label)               \
        EXCEPTION_PROLOG label;                 \
-       addi    r3,r1,STACK_FRAME_OVERHEAD;     \
        xfer(n, hdlr)
 
 #define EXC_XFER_TEMPLATE(hdlr, trap, msr, tfer, ret)          \
@@ -215,7 +214,6 @@ vmap_stack_overflow:
        lwz     r1, emergency_ctx@l(r1)
        addi    r1, r1, THREAD_SIZE - INT_FRAME_SIZE
        EXCEPTION_PROLOG_2 vmap_stack_overflow
-       addi    r3, r1, STACK_FRAME_OVERHEAD
        EXC_XFER_STD(0, stack_overflow_exception)
 .endm
 
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index 86883ccb3dc57b2b39f7b8b0debb35d6c88330ca..08563d4170c6ddc27483662bb3be40b94b703e96 100644 (file)
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -185,7 +185,6 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
 #define CRITICAL_EXCEPTION(n, label, hdlr)                     \
        START_EXCEPTION(n, label);                              \
        CRITICAL_EXCEPTION_PROLOG label;                                \
-       addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
        EXC_XFER_TEMPLATE(hdlr, n+2, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
                          crit_transfer_to_handler, ret_from_crit_exc)
 
@@ -227,13 +226,11 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
 /* 0x0600 - Alignment Exception */
        START_EXCEPTION(0x0600, Alignment)
        EXCEPTION_PROLOG Alignment handle_dar_dsisr=1
-       addi    r3,r1,STACK_FRAME_OVERHEAD
        EXC_XFER_STD(0x600, alignment_exception)
 
 /* 0x0700 - Program Exception */
        START_EXCEPTION(0x0700, ProgramCheck)
        EXCEPTION_PROLOG ProgramCheck handle_dar_dsisr=1
-       addi    r3,r1,STACK_FRAME_OVERHEAD
        EXC_XFER_STD(0x700, program_check_exception)
 
        EXCEPTION(0x0800, Trap_08, unknown_exception, EXC_XFER_STD)
@@ -494,7 +491,6 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
        /* continue normal handling for a critical exception... */
 2:     mfspr   r4,SPRN_DBSR
        stw     r4,_ESR(r11)            /* DebugException takes DBSR in _ESR */
-       addi    r3,r1,STACK_FRAME_OVERHEAD
        EXC_XFER_TEMPLATE(DebugException, 0x2002, \
                (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
                crit_transfer_to_handler, ret_from_crit_exc)
@@ -505,21 +501,18 @@ Decrementer:
        EXCEPTION_PROLOG Decrementer
        lis     r0,TSR_PIS@h
        mtspr   SPRN_TSR,r0             /* Clear the PIT exception */
-       addi    r3,r1,STACK_FRAME_OVERHEAD
        EXC_XFER_LITE(0x1000, timer_interrupt)
 
        /* Fixed Interval Timer (FIT) Exception. (from 0x1010) */
        __HEAD
 FITException:
        EXCEPTION_PROLOG FITException
-       addi    r3,r1,STACK_FRAME_OVERHEAD;
        EXC_XFER_STD(0x1010, unknown_exception)
 
        /* Watchdog Timer (WDT) Exception. (from 0x1020) */
        __HEAD
 WDTException:
        CRITICAL_EXCEPTION_PROLOG WDTException
-       addi    r3,r1,STACK_FRAME_OVERHEAD;
        EXC_XFER_TEMPLATE(WatchdogException, 0x1020+2,
                          (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)),
                          crit_transfer_to_handler, ret_from_crit_exc)
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index 932702a38234ddd531b96973b40ae5a76897cd13..eb1d40a8f2c4e42833fc082a83fdca96ea768934 100644 (file)
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -123,7 +123,6 @@ instruction_counter:
 /* Machine check */
        START_EXCEPTION(0x200, MachineCheck)
        EXCEPTION_PROLOG MachineCheck handle_dar_dsisr=1
-       addi r3,r1,STACK_FRAME_OVERHEAD
        EXC_XFER_STD(0x200, machine_check_exception)
 
 /* External interrupt */
@@ -132,7 +131,6 @@ instruction_counter:
 /* Alignment exception */
        START_EXCEPTION(0x600, Alignment)
        EXCEPTION_PROLOG Alignment handle_dar_dsisr=1
-       addi    r3,r1,STACK_FRAME_OVERHEAD
        EXC_XFER_STD(0x600, alignment_exception)
 
 /* Program check exception */
@@ -348,7 +346,6 @@ DARFixed:/* Return from dcbx instruction bug workaround */
 
 1:     EXCEPTION_PROLOG_1
        EXCEPTION_PROLOG_2 DataBreakpoint handle_dar_dsisr=1
-       addi    r3,r1,STACK_FRAME_OVERHEAD
        mfspr   r4,SPRN_BAR
        stw     r4,_DAR(r11)
        EXC_XFER_STD(0x1c00, do_break)
diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S
index 4ff67c5cae1ca3d663ea8b9a5bf47fef8a70e3b4..453f6ea959f907d0295cfddf94c28ebabb78798d 100644 (file)
--- a/arch/powerpc/kernel/head_book3s_32.S
+++ b/arch/powerpc/kernel/head_book3s_32.S
@@ -267,7 +267,6 @@ __secondary_hold_acknowledge:
 #endif /* CONFIG_PPC_CHRP */
        EXCEPTION_PROLOG_1
 7:     EXCEPTION_PROLOG_2 MachineCheck
-       addi    r3,r1,STACK_FRAME_OVERHEAD
 #ifdef CONFIG_PPC_CHRP
        beq     cr1, 1f
        twi     31, 0, 0
@@ -337,7 +336,6 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE)
 /* Alignment exception */
        START_EXCEPTION(0x600, Alignment)
        EXCEPTION_PROLOG Alignment handle_dar_dsisr=1
-       addi    r3,r1,STACK_FRAME_OVERHEAD
        EXC_XFER_STD(0x600, alignment_exception)
 
 /* Program check exception */
@@ -357,8 +355,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_FPU_UNAVAILABLE)
        beq     1f
        bl      load_up_fpu             /* if from user, just load it up */
        b       fast_exception_return
-1:     addi    r3,r1,STACK_FRAME_OVERHEAD
-       EXC_XFER_LITE(0x800, kernel_fp_unavailable_exception)
+1:     EXC_XFER_LITE(0x800, kernel_fp_unavailable_exception)
 #else
        b       ProgramCheck
 #endif
@@ -722,13 +719,11 @@ AltiVecUnavailable:
        bl      load_up_altivec         /* if from user, just load it up */
        b       fast_exception_return
 #endif /* CONFIG_ALTIVEC */
-1:     addi    r3,r1,STACK_FRAME_OVERHEAD
-       EXC_XFER_LITE(0xf20, altivec_unavailable_exception)
+1:     EXC_XFER_LITE(0xf20, altivec_unavailable_exception)
 
        __HEAD
 PerformanceMonitor:
        EXCEPTION_PROLOG PerformanceMonitor
-       addi    r3,r1,STACK_FRAME_OVERHEAD
        EXC_XFER_STD(0xf00, performance_monitor_exception)
 
 
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index b31bf9e833c0c1e36ff396b2db50eccba7f465c6..009a56d70d76a7beb1eb0b2bddfd1f9c4aed67e2 100644 (file)
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -294,13 +294,11 @@ label:
 #define EXCEPTION(n, intno, label, hdlr, xfer)                 \
        START_EXCEPTION(label);                                 \
        NORMAL_EXCEPTION_PROLOG(intno);                         \
-       addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
        xfer(n, hdlr)
 
 #define CRITICAL_EXCEPTION(n, intno, label, hdlr)                      \
        START_EXCEPTION(label);                                         \
        CRITICAL_EXCEPTION_PROLOG(intno);                               \
-       addi    r3,r1,STACK_FRAME_OVERHEAD;                             \
        SAVE_MMU_REGS;                                                  \
        SAVE_xSRR(SRR);                                                 \
        EXC_XFER_TEMPLATE(hdlr, n+2, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
@@ -311,7 +309,6 @@ label:
        MCHECK_EXCEPTION_PROLOG;                                \
        mfspr   r5,SPRN_ESR;                                    \
        stw     r5,_ESR(r11);                                   \
-       addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
        SAVE_xSRR(DSRR);                                        \
        SAVE_xSRR(CSRR);                                        \
        SAVE_MMU_REGS;                                          \
@@ -398,7 +395,6 @@ label:
        /* continue normal handling for a debug exception... */               \
 2:     mfspr   r4,SPRN_DBSR;                                                 \
        stw     r4,_ESR(r11);           /* DebugException takes DBSR in _ESR */\
-       addi    r3,r1,STACK_FRAME_OVERHEAD;                                   \
        SAVE_xSRR(CSRR);                                                      \
        SAVE_MMU_REGS;                                                        \
        SAVE_xSRR(SRR);                                                       \
@@ -455,7 +451,6 @@ label:
        /* continue normal handling for a critical exception... */            \
 2:     mfspr   r4,SPRN_DBSR;                                                 \
        stw     r4,_ESR(r11);           /* DebugException takes DBSR in _ESR */\
-       addi    r3,r1,STACK_FRAME_OVERHEAD;                                   \
        SAVE_MMU_REGS;                                                        \
        SAVE_xSRR(SRR);                                                       \
        EXC_XFER_TEMPLATE(DebugException, 0x2002, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), crit_transfer_to_handler, ret_from_crit_exc)
@@ -482,7 +477,6 @@ label:
        NORMAL_EXCEPTION_PROLOG(ALIGNMENT);                   \
        mfspr   r4,SPRN_DEAR;           /* Grab the DEAR and save it */       \
        stw     r4,_DEAR(r11);                                                \
-       addi    r3,r1,STACK_FRAME_OVERHEAD;                                   \
        EXC_XFER_STD(0x0600, alignment_exception)
 
 #define PROGRAM_EXCEPTION                                                    \
@@ -490,7 +484,6 @@ label:
        NORMAL_EXCEPTION_PROLOG(PROGRAM);                     \
        mfspr   r4,SPRN_ESR;            /* Grab the ESR and save it */        \
        stw     r4,_ESR(r11);                                                 \
-       addi    r3,r1,STACK_FRAME_OVERHEAD;                                   \
        EXC_XFER_STD(0x0700, program_check_exception)
 
 #define DECREMENTER_EXCEPTION                                                \
@@ -498,7 +491,6 @@ label:
        NORMAL_EXCEPTION_PROLOG(DECREMENTER);                 \
        lis     r0,TSR_DIS@h;           /* Setup the DEC interrupt mask */    \
        mtspr   SPRN_TSR,r0;            /* Clear the DEC interrupt */         \
-       addi    r3,r1,STACK_FRAME_OVERHEAD;                                   \
        EXC_XFER_LITE(0x0900, timer_interrupt)
 
 #define FP_UNAVAILABLE_EXCEPTION                                             \
@@ -507,8 +499,7 @@ label:
        beq     1f;                                                           \
        bl      load_up_fpu;            /* if from user, just load it up */   \
        b       fast_exception_return;                                        \
-1:     addi    r3,r1,STACK_FRAME_OVERHEAD;                                   \
-       EXC_XFER_STD(0x800, kernel_fp_unavailable_exception)
+1:     EXC_XFER_STD(0x800, kernel_fp_unavailable_exception)
 
 #else /* __ASSEMBLY__ */
 struct exception_regs {
diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S
index 3f4a40cccef5df87e6deeabc82dffa9d7a39201e..f51c66f747ad270ec04bcd2ca1dc64f532512b80 100644 (file)
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -372,7 +372,6 @@ interrupt_base:
        bne     1f
        EXC_XFER_LITE(0x0300, handle_page_fault)
 1:
-       addi    r3,r1,STACK_FRAME_OVERHEAD
        EXC_XFER_LITE(0x0300, CacheLockingException)
 
        /* Instruction Storage Interrupt */
@@ -618,8 +617,7 @@ END_BTB_FLUSH_SECTION
        beq     1f
        bl      load_up_spe
        b       fast_exception_return
-1:     addi    r3,r1,STACK_FRAME_OVERHEAD
-       EXC_XFER_LITE(0x2010, KernelSPE)
+1:     EXC_XFER_LITE(0x2010, KernelSPE)
 #elif defined(CONFIG_SPE_POSSIBLE)
        EXCEPTION(0x2020, SPE_UNAVAIL, SPEUnavailable, \
                  unknown_exception, EXC_XFER_STD)
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