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| author |   Max Filippov <jcmvbkbc@gmail.com> | 2021-05-01 15:30:06 -0700 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2021-10-18 22:19:34 -0700 |
| commit | 5cce39b6aaa02da77e071b2b0880bedfb903330f (patch) | |
| tree | d4df6d3789a200149709d25b9c5510a9b7ff2c64 /arch/xtensa/include/asm/processor.h | |
| parent | xtensa: don't use a12 in __xtensa_copy_user in call0 ABI (diff) | |
| download | linux-dev-5cce39b6aaa02da77e071b2b0880bedfb903330f.tar.xz linux-dev-5cce39b6aaa02da77e071b2b0880bedfb903330f.zip | |
xtensa: definitions for call0 ABI
Add assembly macros for calls, call arguments, preserved registers,
function entry and return for windowed and call0 ABIs.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/include/asm/processor.h')
| -rw-r--r-- | arch/xtensa/include/asm/processor.h | 32 |
1 files changed, 26 insertions, 6 deletions
diff --git a/arch/xtensa/include/asm/processor.h b/arch/xtensa/include/asm/processor.h index 7f63aca6a0d3..aeec2916030c 100644 --- a/arch/xtensa/include/asm/processor.h +++ b/arch/xtensa/include/asm/processor.h @@ -18,12 +18,6 @@ #include <asm/types.h> #include <asm/regs.h> -/* Assertions. */ - -#if (XCHAL_HAVE_WINDOWED != 1) -# error Linux requires the Xtensa Windowed Registers Option. -#endif - /* Xtensa ABI requires stack alignment to be at least 16 */ #define STACK_ALIGN (XCHAL_DATA_WIDTH > 16 ? XCHAL_DATA_WIDTH : 16) @@ -105,8 +99,18 @@ #define WSBITS (XCHAL_NUM_AREGS / 4) /* width of WINDOWSTART in bits */ #define WBBITS (XCHAL_NUM_AREGS_LOG2 - 2) /* width of WINDOWBASE in bits */ +#if defined(__XTENSA_WINDOWED_ABI__) +#define KERNEL_PS_WOE_MASK PS_WOE_MASK +#elif defined(__XTENSA_CALL0_ABI__) +#define KERNEL_PS_WOE_MASK 0 +#else +#error Unsupported xtensa ABI +#endif + #ifndef __ASSEMBLY__ +#if defined(__XTENSA_WINDOWED_ABI__) + /* Build a valid return address for the specified call winsize. * winsize must be 1 (call4), 2 (call8), or 3 (call12) */ @@ -117,6 +121,22 @@ */ #define MAKE_PC_FROM_RA(ra,sp) (((ra) & 0x3fffffff) | ((sp) & 0xc0000000)) +#elif defined(__XTENSA_CALL0_ABI__) + +/* Build a valid return address for the specified call winsize. + * winsize must be 1 (call4), 2 (call8), or 3 (call12) + */ +#define MAKE_RA_FOR_CALL(ra, ws) (ra) + +/* Convert return address to a valid pc + * Note: We assume that the stack pointer is in the same 1GB ranges as the ra + */ +#define MAKE_PC_FROM_RA(ra, sp) (ra) + +#else +#error Unsupported Xtensa ABI +#endif + /* Spill slot location for the register reg in the spill area under the stack * pointer sp. reg must be in the range [0..4). */ |