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| author | Ard Biesheuvel <ardb@kernel.org> | 2023-03-20 00:07:20 +0100 |
|---|---|---|
| committer | Ard Biesheuvel <ardb@kernel.org> | 2023-05-17 15:08:22 +0200 |
| commit | 303d6da167dcbc3dd89adf3ca4e36c369950ed01 (patch) | |
| tree | 6041481a3b42a3ec4c2940e02201128396b47e2f /arch/arm/include/asm | |
| parent | 8bcba70cb5c2204a011e06278a1fbfb1213e1df1 (diff) | |
| download | linux-303d6da167dcbc3dd89adf3ca4e36c369950ed01.tar.gz linux-303d6da167dcbc3dd89adf3ca4e36c369950ed01.tar.bz2 linux-303d6da167dcbc3dd89adf3ca4e36c369950ed01.zip | |
ARM: iwmmxt: Use undef hook to enable coprocessor for task
Define a undef hook to deal with undef exceptions triggered by iwmmxt
instructions that were issued with the coprocessor disabled. This
removes the dependency on the coprocessor dispatch code in entry-armv.S,
which will be made NWFPE-only in a subsequent patch.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Diffstat (limited to 'arch/arm/include/asm')
| -rw-r--r-- | arch/arm/include/asm/thread_info.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/arm/include/asm/thread_info.h b/arch/arm/include/asm/thread_info.h index 85c5f1e02ebf..943ffcf069d2 100644 --- a/arch/arm/include/asm/thread_info.h +++ b/arch/arm/include/asm/thread_info.h @@ -40,6 +40,7 @@ struct task_struct; DECLARE_PER_CPU(struct task_struct *, __entry_task); #include <asm/types.h> +#include <asm/traps.h> struct cpu_context_save { __u32 r4; @@ -104,6 +105,21 @@ extern void iwmmxt_task_restore(struct thread_info *, void *); extern void iwmmxt_task_release(struct thread_info *); extern void iwmmxt_task_switch(struct thread_info *); +extern int iwmmxt_undef_handler(struct pt_regs *, u32); + +static inline void register_iwmmxt_undef_handler(void) +{ + static struct undef_hook iwmmxt_undef_hook = { + .instr_mask = 0x0c000e00, + .instr_val = 0x0c000000, + .cpsr_mask = MODE_MASK | PSR_T_BIT, + .cpsr_val = USR_MODE, + .fn = iwmmxt_undef_handler, + }; + + register_undef_hook(&iwmmxt_undef_hook); +} + extern void vfp_sync_hwstate(struct thread_info *); extern void vfp_flush_hwstate(struct thread_info *); |