diff options
Diffstat (limited to 'arch/xtensa/include/asm/asmmacro.h')
| -rw-r--r-- | arch/xtensa/include/asm/asmmacro.h | 195 |
1 files changed, 191 insertions, 4 deletions
diff --git a/arch/xtensa/include/asm/asmmacro.h b/arch/xtensa/include/asm/asmmacro.h index 755320f6e0bc..a52d49a16ce7 100644 --- a/arch/xtensa/include/asm/asmmacro.h +++ b/arch/xtensa/include/asm/asmmacro.h @@ -11,7 +11,8 @@ #ifndef _XTENSA_ASMMACRO_H #define _XTENSA_ASMMACRO_H -#include <variant/core.h> +#include <linux/export.h> +#include <asm/core.h> /* * Some little helpers for loops. Use zero-overhead-loops @@ -35,9 +36,10 @@ * __loop as * restart loop. 'as' register must not have been modified! * - * __endla ar, at, incr + * __endla ar, as, incr * ar start address (modified) - * as scratch register used by macro + * as scratch register used by __loops/__loopi macros or + * end address used by __loopt macro * inc increment */ @@ -97,7 +99,7 @@ .endm /* - * loop from ar to ax + * loop from ar to as */ .macro __loopt ar, as, at, incr_log2 @@ -149,5 +151,190 @@ __endl \ar \as .endm +/* Load or store instructions that may cause exceptions use the EX macro. */ + +#define EX(handler) \ + .section __ex_table, "a"; \ + .word 97f, handler; \ + .previous \ +97: + + +/* + * Extract unaligned word that is split between two registers w0 and w1 + * into r regardless of machine endianness. SAR must be loaded with the + * starting bit of the word (see __ssa8). + */ + + .macro __src_b r, w0, w1 +#ifdef __XTENSA_EB__ + src \r, \w0, \w1 +#else + src \r, \w1, \w0 +#endif + .endm + +/* + * Load 2 lowest address bits of r into SAR for __src_b to extract unaligned + * word starting at r from two registers loaded from consecutive aligned + * addresses covering r regardless of machine endianness. + * + * r 0 1 2 3 + * LE SAR 0 8 16 24 + * BE SAR 32 24 16 8 + */ + + .macro __ssa8 r +#ifdef __XTENSA_EB__ + ssa8b \r +#else + ssa8l \r +#endif + .endm + + .macro do_nsau cnt, val, tmp, a +#if XCHAL_HAVE_NSA + nsau \cnt, \val +#else + mov \a, \val + movi \cnt, 0 + extui \tmp, \a, 16, 16 + bnez \tmp, 0f + movi \cnt, 16 + slli \a, \a, 16 +0: + extui \tmp, \a, 24, 8 + bnez \tmp, 1f + addi \cnt, \cnt, 8 + slli \a, \a, 8 +1: + movi \tmp, __nsau_data + extui \a, \a, 24, 8 + add \tmp, \tmp, \a + l8ui \tmp, \tmp, 0 + add \cnt, \cnt, \tmp +#endif /* !XCHAL_HAVE_NSA */ + .endm + + .macro do_abs dst, src, tmp +#if XCHAL_HAVE_ABS + abs \dst, \src +#else + neg \tmp, \src + movgez \tmp, \src, \src + mov \dst, \tmp +#endif + .endm + +#if defined(__XTENSA_WINDOWED_ABI__) + +/* Assembly instructions for windowed kernel ABI. */ +#define KABI_W +/* Assembly instructions for call0 kernel ABI (will be ignored). */ +#define KABI_C0 # + +#define XTENSA_FRAME_SIZE_RESERVE 16 +#define XTENSA_SPILL_STACK_RESERVE 32 + +#define abi_entry(frame_size) \ + entry sp, (XTENSA_FRAME_SIZE_RESERVE + \ + (((frame_size) + XTENSA_STACK_ALIGNMENT - 1) & \ + -XTENSA_STACK_ALIGNMENT)) +#define abi_entry_default abi_entry(0) + +#define abi_ret(frame_size) retw +#define abi_ret_default retw + + /* direct call */ +#define abi_call call4 + /* indirect call */ +#define abi_callx callx4 + /* outgoing call argument registers */ +#define abi_arg0 a6 +#define abi_arg1 a7 +#define abi_arg2 a8 +#define abi_arg3 a9 +#define abi_arg4 a10 +#define abi_arg5 a11 + /* return value */ +#define abi_rv a6 + /* registers preserved across call */ +#define abi_saved0 a2 +#define abi_saved1 a3 + + /* none of the above */ +#define abi_tmp0 a4 +#define abi_tmp1 a5 + +#elif defined(__XTENSA_CALL0_ABI__) + +/* Assembly instructions for windowed kernel ABI (will be ignored). */ +#define KABI_W # +/* Assembly instructions for call0 kernel ABI. */ +#define KABI_C0 + +#define XTENSA_SPILL_STACK_RESERVE 0 + +#define abi_entry(frame_size) __abi_entry (frame_size) + + .macro __abi_entry frame_size + .ifgt \frame_size + addi sp, sp, -(((\frame_size) + XTENSA_STACK_ALIGNMENT - 1) & \ + -XTENSA_STACK_ALIGNMENT) + .endif + .endm + +#define abi_entry_default + +#define abi_ret(frame_size) __abi_ret (frame_size) + + .macro __abi_ret frame_size + .ifgt \frame_size + addi sp, sp, (((\frame_size) + XTENSA_STACK_ALIGNMENT - 1) & \ + -XTENSA_STACK_ALIGNMENT) + .endif + ret + .endm + +#define abi_ret_default ret + + /* direct call */ +#define abi_call call0 + /* indirect call */ +#define abi_callx callx0 + /* outgoing call argument registers */ +#define abi_arg0 a2 +#define abi_arg1 a3 +#define abi_arg2 a4 +#define abi_arg3 a5 +#define abi_arg4 a6 +#define abi_arg5 a7 + /* return value */ +#define abi_rv a2 + /* registers preserved across call */ +#define abi_saved0 a12 +#define abi_saved1 a13 + + /* none of the above */ +#define abi_tmp0 a8 +#define abi_tmp1 a9 + +#else +#error Unsupported Xtensa ABI +#endif + +#if defined(USER_SUPPORT_WINDOWED) +/* Assembly instructions for windowed user ABI. */ +#define UABI_W +/* Assembly instructions for call0 user ABI (will be ignored). */ +#define UABI_C0 # +#else +/* Assembly instructions for windowed user ABI (will be ignored). */ +#define UABI_W # +/* Assembly instructions for call0 user ABI. */ +#define UABI_C0 +#endif + +#define __XTENSA_HANDLER .section ".exception.text", "ax" #endif /* _XTENSA_ASMMACRO_H */ |