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| author | Max Filippov <jcmvbkbc@gmail.com> | 2021-05-01 15:32:58 -0700 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2021-10-18 22:19:35 -0700 |
| commit | 0b5372570b1f3fcb35255d28e707846e613c27f2 (patch) | |
| tree | 7f38b947b50ad051903ec2d251fb51f3c62bc706 /arch/xtensa/kernel/head.S | |
| parent | 5cce39b6aaa02da77e071b2b0880bedfb903330f (diff) | |
| download | linux-0b5372570b1f3fcb35255d28e707846e613c27f2.tar.gz linux-0b5372570b1f3fcb35255d28e707846e613c27f2.tar.bz2 linux-0b5372570b1f3fcb35255d28e707846e613c27f2.zip | |
xtensa: implement call0 ABI support in assembly
Replace hardcoded register and opcode names with ABI-agnostic macros.
Add register save/restore code where necessary. Conditionalize windowed
only or call0 only code. Add stack initialization matching _switch_to
epilogue to copy_thread.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/kernel/head.S')
| -rw-r--r-- | arch/xtensa/kernel/head.S | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/arch/xtensa/kernel/head.S b/arch/xtensa/kernel/head.S index b9b81e76beea..8972d64e0b86 100644 --- a/arch/xtensa/kernel/head.S +++ b/arch/xtensa/kernel/head.S @@ -15,6 +15,7 @@ * Kevin Chea */ +#include <asm/asmmacro.h> #include <asm/processor.h> #include <asm/page.h> #include <asm/cacheasm.h> @@ -193,9 +194,10 @@ ENTRY(_startup) movi a1, start_info l32i a1, a1, 0 - movi a2, PS_WOE_MASK | LOCKLEVEL - # WOE=1, INTLEVEL=LOCKLEVEL, UM=0 - wsr a2, ps # (enable reg-windows; progmode stack) + /* Disable interrupts. */ + /* Enable window exceptions if kernel is built with windowed ABI. */ + movi a2, KERNEL_PS_WOE_MASK | LOCKLEVEL + wsr a2, ps rsync #ifdef CONFIG_SMP @@ -267,13 +269,13 @@ ENTRY(_startup) l32i a1, a1, 0 #endif - movi a6, 0 - xsr a6, excsave1 + movi abi_arg0, 0 + xsr abi_arg0, excsave1 /* init_arch kick-starts the linux kernel */ - call4 init_arch - call4 start_kernel + abi_call init_arch + abi_call start_kernel should_never_return: j should_never_return @@ -297,10 +299,10 @@ should_never_return: s32i a3, a2, 0 memw - movi a6, 0 - wsr a6, excsave1 + movi abi_arg0, 0 + wsr abi_arg0, excsave1 - call4 secondary_start_kernel + abi_call secondary_start_kernel j should_never_return #endif /* CONFIG_SMP */ |