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authorNicholas Piggin <npiggin@gmail.com>2021-06-17 17:51:08 +0200
committerMichael Ellerman <mpe@ellerman.id.au>2021-06-24 16:06:56 +0200
commitf23699c93becd746295aaa506537882a46a62219 (patch)
treeea44289996524915c83e6876b39babbe6a640ff8 /arch/powerpc/include/asm/ppc_asm.h
parentpowerpc/64s: save one more register in the masked interrupt handler (diff)
downloadlinux-f23699c93becd746295aaa506537882a46a62219.tar.xz
linux-f23699c93becd746295aaa506537882a46a62219.zip
powerpc/64: allow alternate return locations for soft-masked interrupts
The exception table fixup adjusts a failed page fault's interrupt return location if it was taken at an address specified in the exception table, to a corresponding fixup handler address. Introduce a variation of that idea which adds a fixup table for NMIs and soft-masked asynchronous interrupts. This will be used to protect certain critical sections that are sensitive to being clobbered by interrupts coming in (due to using the same SPRs and/or irq soft-mask state). Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210617155116.2167984-10-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/include/asm/ppc_asm.h')
-rw-r--r--arch/powerpc/include/asm/ppc_asm.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h
index d6739d700f0a..c9c2c36c1f8f 100644
--- a/arch/powerpc/include/asm/ppc_asm.h
+++ b/arch/powerpc/include/asm/ppc_asm.h
@@ -762,6 +762,14 @@ END_FTR_SECTION_NESTED(CPU_FTR_CELL_TB_BUG, CPU_FTR_CELL_TB_BUG, 96)
stringify_in_c(.long (_target) - . ;) \
stringify_in_c(.previous)
+#define RESTART_TABLE(_start, _end, _target) \
+ stringify_in_c(.section __restart_table,"a";)\
+ stringify_in_c(.balign 8;) \
+ stringify_in_c(.llong (_start);) \
+ stringify_in_c(.llong (_end);) \
+ stringify_in_c(.llong (_target);) \
+ stringify_in_c(.previous)
+
#ifdef CONFIG_PPC_FSL_BOOK3E
#define BTB_FLUSH(reg) \
lis reg,BUCSR_INIT@h; \