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py: Add inline Xtensa assembler.

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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.
This commit is contained in:
Damien George
2016-12-09 17:03:33 +11:00
parent ad297a1950
commit f76b1bfa9f
6 changed files with 380 additions and 3 deletions
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4
py/asmxtensa.c
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@@ -30,7 +30,7 @@
#include "py/mpconfig.h"
// wrapper around everything in this file
#if MICROPY_EMIT_XTENSA
#if MICROPY_EMIT_XTENSA || MICROPY_EMIT_INLINE_XTENSA
#include "py/asmxtensa.h"
@@ -167,4 +167,4 @@ void asm_xtensa_mov_reg_local_addr(asm_xtensa_t *as, uint reg_dest, int local_nu
asm_xtensa_op_addi(as, reg_dest, reg_dest, (4 + local_num) * WORD_SIZE);
}
#endif // MICROPY_EMIT_XTENSA
#endif // MICROPY_EMIT_XTENSA || MICROPY_EMIT_INLINE_XTENSA