diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2021-06-18 01:51:10 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-06-25 00:06:56 +1000 |
| commit | 9d1988ca87dd90ecf80a0601c7fd13071fbb1a83 (patch) | |
| tree | efef71434955ee8cfe2edd8414fde31434040d5f /arch/powerpc/kernel/exceptions-64e.S | |
| parent | 862fa563524b9f92d7e89fe332732bd3421772db (diff) | |
powerpc/64: treat low kernel text as irqs soft-masked
Treat code below __end_soft_masked as soft-masked for the purpose
of alternate return. 64s already mostly does this for scv entry.
This will be used to exit from interrupts without disabling MSR[EE].
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210617155116.2167984-12-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/kernel/exceptions-64e.S')
| -rw-r--r-- | arch/powerpc/kernel/exceptions-64e.S | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S index 1b79f8a75298..22fcd95dd8dc 100644 --- a/arch/powerpc/kernel/exceptions-64e.S +++ b/arch/powerpc/kernel/exceptions-64e.S @@ -342,7 +342,17 @@ ret_from_mc_except: #define PROLOG_ADDITION_MASKABLE_GEN(n) \ lbz r10,PACAIRQSOFTMASK(r13); /* are irqs soft-masked? */ \ andi. r10,r10,IRQS_DISABLED; /* yes -> go out of line */ \ - bne masked_interrupt_book3e_##n + bne masked_interrupt_book3e_##n; \ + /* Kernel code below __end_soft_masked is implicitly masked */ \ + andi. r10,r11,MSR_PR; \ + bne 1f; /* user -> not masked */ \ + std r14,PACA_EXGEN+EX_R14(r13); \ + LOAD_REG_IMMEDIATE_SYM(r14, r10, __end_soft_masked); \ + mfspr r10,SPRN_SRR0; \ + cmpld r10,r14; \ + ld r14,PACA_EXGEN+EX_R14(r13); \ + blt masked_interrupt_book3e_##n; \ +1: /* * Additional regs must be re-loaded from paca before EXCEPTION_COMMON* is |