diff options
| author | Ard Biesheuvel <ardb@kernel.org> | 2021-10-05 09:15:40 +0200 |
|---|---|---|
| committer | Ard Biesheuvel <ardb@kernel.org> | 2021-12-03 15:11:31 +0100 |
| commit | d4664b6c987f80338407889c1e3f3abe7e16be94 (patch) | |
| tree | 21565f50f64551f10a68d2df793711ac07962c53 /arch/arm/include/asm/assembler.h | |
| parent | eae9523fdd7a6c592e80666681962acbd913cda2 (diff) | |
ARM: implement IRQ stacks
Now that we no longer rely on the stack pointer to access the current
task struct or thread info, we can implement support for IRQ stacks
cleanly as well.
Define a per-CPU IRQ stack and switch to this stack when taking an IRQ,
provided that we were not already using that stack in the interrupted
context. This is never the case for IRQs taken from user space, but ones
taken while running in the kernel could fire while one taken from user
space has not completed yet.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Keith Packard <keithpac@amazon.com>
Acked-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Marc Zyngier <maz@kernel.org>
Tested-by: Vladimir Murzin <vladimir.murzin@arm.com> # ARMv7M
Diffstat (limited to 'arch/arm/include/asm/assembler.h')
| -rw-r--r-- | arch/arm/include/asm/assembler.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/include/asm/assembler.h b/arch/arm/include/asm/assembler.h index 870bfaea4318..1b9d4df331aa 100644 --- a/arch/arm/include/asm/assembler.h +++ b/arch/arm/include/asm/assembler.h @@ -86,6 +86,10 @@ #define IMM12_MASK 0xfff +/* the frame pointer used for stack unwinding */ +ARM( fpreg .req r11 ) +THUMB( fpreg .req r7 ) + /* * Enable and disable interrupts */ |