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py: Add inline Xtensa assembler.
This patch adds the MICROPY_EMIT_INLINE_XTENSA option, which, when enabled, allows the @micropython.asm_xtensa decorator to be used. The following opcodes are currently supported (ax is a register, a0-a15): ret_n() callx0(ax) j(label) jx(ax) beqz(ax, label) bnez(ax, label) mov(ax, ay) movi(ax, imm) # imm can be full 32-bit, uses l32r if needed and_(ax, ay, az) or_(ax, ay, az) xor(ax, ay, az) add(ax, ay, az) sub(ax, ay, az) mull(ax, ay, az) l8ui(ax, ay, imm) l16ui(ax, ay, imm) l32i(ax, ay, imm) s8i(ax, ay, imm) s16i(ax, ay, imm) s32i(ax, ay, imm) l16si(ax, ay, imm) addi(ax, ay, imm) ball(ax, ay, label) bany(ax, ay, label) bbc(ax, ay, label) bbs(ax, ay, label) beq(ax, ay, label) bge(ax, ay, label) bgeu(ax, ay, label) blt(ax, ay, label) bnall(ax, ay, label) bne(ax, ay, label) bnone(ax, ay, label) Upon entry to the assembly function the registers a0, a12, a13, a14 are pushed to the stack and the stack pointer (a1) decreased by 16. Upon exit, these registers and the stack pointer are restored, and ret.n is executed to return to the caller (caller address is in a0). Note that the ABI for the Xtensa emitters is non-windowing.
1 parent ad297a1 commit f76b1bf

6 files changed

Lines changed: 380 additions & 3 deletions

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‎py/asmxtensa.c‎

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@@ -30,7 +30,7 @@
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#include "py/mpconfig.h"
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// wrapper around everything in this file
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#if MICROPY_EMIT_XTENSA
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#if MICROPY_EMIT_XTENSA || MICROPY_EMIT_INLINE_XTENSA
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#include "py/asmxtensa.h"
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@@ -167,4 +167,4 @@ void asm_xtensa_mov_reg_local_addr(asm_xtensa_t *as, uint reg_dest, int local_nu
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asm_xtensa_op_addi(as, reg_dest, reg_dest, (4 + local_num) * WORD_SIZE);
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}
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#endif // MICROPY_EMIT_XTENSA
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#endif // MICROPY_EMIT_XTENSA || MICROPY_EMIT_INLINE_XTENSA

‎py/compile.c‎

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@@ -91,6 +91,9 @@ typedef enum {
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#if MICROPY_EMIT_INLINE_THUMB
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#define ASM_DECORATOR_QSTR MP_QSTR_asm_thumb
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#define ASM_EMITTER(f) emit_inline_thumb_##f
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#elif MICROPY_EMIT_INLINE_XTENSA
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#define ASM_DECORATOR_QSTR MP_QSTR_asm_xtensa
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#define ASM_EMITTER(f) emit_inline_xtensa_##f
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#else
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#error "unknown asm emitter"
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#endif

‎py/emit.h‎

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@@ -272,9 +272,13 @@ typedef struct _emit_inline_asm_method_table_t {
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} emit_inline_asm_method_table_t;
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extern const emit_inline_asm_method_table_t emit_inline_thumb_method_table;
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extern const emit_inline_asm_method_table_t emit_inline_xtensa_method_table;
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emit_inline_asm_t *emit_inline_thumb_new(mp_uint_t max_num_labels);
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emit_inline_asm_t *emit_inline_xtensa_new(mp_uint_t max_num_labels);
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void emit_inline_thumb_free(emit_inline_asm_t *emit);
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void emit_inline_xtensa_free(emit_inline_asm_t *emit);
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#if MICROPY_WARNINGS
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void mp_emitter_warning(pass_kind_t pass, const char *msg);

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