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| author | Nicholas Piggin <npiggin@gmail.com> | 2022-09-26 05:40:53 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2022-09-28 11:22:12 +0200 |
| commit | 17773afdcd1589c5925a984f512330410cb2ba4f (patch) | |
| tree | 0f209601034524b3258a4280e1b293c4581218da /arch/powerpc/kernel/interrupt_64.S | |
| parent | powerpc/64s: POWER10 CPU Kconfig build option (diff) | |
| download | linux-17773afdcd1589c5925a984f512330410cb2ba4f.tar.xz linux-17773afdcd1589c5925a984f512330410cb2ba4f.zip | |
powerpc/64: use 32-bit immediate for STACK_FRAME_REGS_MARKER
Using a 32-bit constant for this marker allows it to be loaded with
two ALU instructions, like 32-bit. This avoids a TOC entry and a
TOC load that depends on the r2 value that has just been loaded from
the PACA.
This changes the value for 32-bit as well, so both have the same
value in the low 4 bytes and 64-bit has 0 in the top bytes.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220926034057.2360083-2-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/kernel/interrupt_64.S')
| -rw-r--r-- | arch/powerpc/kernel/interrupt_64.S | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/interrupt_64.S b/arch/powerpc/kernel/interrupt_64.S index 1dfa67e9199a..f02c55930b5c 100644 --- a/arch/powerpc/kernel/interrupt_64.S +++ b/arch/powerpc/kernel/interrupt_64.S @@ -80,7 +80,7 @@ _ASM_NOKPROBE_SYMBOL(system_call_vectored_\name) /* Calling convention has r3 = regs, r4 = orig r0 */ addi r3,r1,STACK_FRAME_OVERHEAD mr r4,r0 - ld r11,exception_marker@toc(r2) + LOAD_REG_IMMEDIATE(r11, STACK_FRAME_REGS_MARKER) std r11,-16(r3) /* "regshere" marker */ BEGIN_FTR_SECTION @@ -253,7 +253,7 @@ END_BTB_FLUSH_SECTION /* Calling convention has r3 = regs, r4 = orig r0 */ addi r3,r1,STACK_FRAME_OVERHEAD mr r4,r0 - ld r11,exception_marker@toc(r2) + LOAD_REG_IMMEDIATE(r11, STACK_FRAME_REGS_MARKER) std r11,-16(r3) /* "regshere" marker */ #ifdef CONFIG_PPC_BOOK3S @@ -614,7 +614,7 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS) mtspr SPRN_XER,r5 /* - * Leaving a stale exception_marker on the stack can confuse + * Leaving a stale STACK_FRAME_REGS_MARKER on the stack can confuse * the reliable stack unwinder later on. Clear it. */ std r0,STACK_FRAME_OVERHEAD-16(r1) |