diff options
Diffstat (limited to 'py/asmxtensa.c')
| -rw-r--r-- | py/asmxtensa.c | 146 |
1 files changed, 128 insertions, 18 deletions
diff --git a/py/asmxtensa.c b/py/asmxtensa.c index 0fbe351dcf..85a8cfef55 100644 --- a/py/asmxtensa.c +++ b/py/asmxtensa.c @@ -34,9 +34,20 @@ #include "py/asmxtensa.h" +#if N_XTENSAWIN +#define REG_TEMP ASM_XTENSA_REG_TEMPORARY_WIN +#else +#define REG_TEMP ASM_XTENSA_REG_TEMPORARY +#endif + #define WORD_SIZE (4) +#define SIGNED_FIT6(x) ((((x) & 0xffffffe0) == 0) || (((x) & 0xffffffe0) == 0xffffffe0)) #define SIGNED_FIT8(x) ((((x) & 0xffffff80) == 0) || (((x) & 0xffffff80) == 0xffffff80)) #define SIGNED_FIT12(x) ((((x) & 0xfffff800) == 0) || (((x) & 0xfffff800) == 0xfffff800)) +#define SIGNED_FIT18(x) ((((x) & 0xfffe0000) == 0) || (((x) & 0xfffe0000) == 0xfffe0000)) + +#define ET_OUT_OF_RANGE MP_ERROR_TEXT("ERROR: xtensa %q out of range") +#define ET_NOT_ALIGNED MP_ERROR_TEXT("ERROR: %q %q not word-aligned") void asm_xtensa_end_pass(asm_xtensa_t *as) { as->num_const = as->cur_const; @@ -47,9 +58,9 @@ void asm_xtensa_end_pass(asm_xtensa_t *as) { if (as->base.pass == MP_ASM_PASS_EMIT) { uint8_t *d = as->base.code_base; printf("XTENSA ASM:"); - for (int i = 0; i < ((as->base.code_size + 15) & ~15); ++i) { + for (size_t i = 0; i < ((as->base.code_size + 15) & ~15); ++i) { if (i % 16 == 0) { - printf("\n%08x:", (uint32_t)&d[i]); + printf("\n%p:", &d[i]); } if (i % 2 == 0) { printf(" "); @@ -62,10 +73,12 @@ void asm_xtensa_end_pass(asm_xtensa_t *as) { } void asm_xtensa_entry(asm_xtensa_t *as, int num_locals) { - // jump over the constants - asm_xtensa_op_j(as, as->num_const * WORD_SIZE + 4 - 4); - mp_asm_base_get_cur_to_write_bytes(&as->base, 1); // padding/alignment byte - as->const_table = (uint32_t *)mp_asm_base_get_cur_to_write_bytes(&as->base, as->num_const * 4); + if (as->num_const > 0) { + // jump over the constants + asm_xtensa_op_j(as, as->num_const * WORD_SIZE + 4 - 4); + mp_asm_base_get_cur_to_write_bytes(&as->base, 1); // padding/alignment byte + as->const_table = (uint32_t *)mp_asm_base_get_cur_to_write_bytes(&as->base, as->num_const * 4); + } // adjust the stack-pointer to store a0, a12, a13, a14, a15 and locals, 16-byte aligned as->stack_adjust = (((ASM_XTENSA_NUM_REGS_SAVED + num_locals) * WORD_SIZE) + 15) & ~15; @@ -146,22 +159,60 @@ void asm_xtensa_j_label(asm_xtensa_t *as, uint label) { asm_xtensa_op_j(as, rel); } +static bool calculate_branch_displacement(asm_xtensa_t *as, uint label, ptrdiff_t *displacement) { + assert(displacement != NULL && "Displacement pointer is NULL"); + + uint32_t label_offset = get_label_dest(as, label); + *displacement = (ptrdiff_t)(label_offset - as->base.code_offset - 4); + return (label_offset != (uint32_t)-1) && (*displacement < 0); +} + void asm_xtensa_bccz_reg_label(asm_xtensa_t *as, uint cond, uint reg, uint label) { - uint32_t dest = get_label_dest(as, label); - int32_t rel = dest - as->base.code_offset - 4; - if (as->base.pass == MP_ASM_PASS_EMIT && !SIGNED_FIT12(rel)) { - printf("ERROR: xtensa bccz out of range\n"); + ptrdiff_t rel = 0; + bool can_emit_short_jump = calculate_branch_displacement(as, label, &rel); + + if (can_emit_short_jump && SIGNED_FIT12(rel)) { + // Backwards BCCZ opcodes with an offset that fits in 12 bits can + // be emitted without any change. + asm_xtensa_op_bccz(as, cond, reg, rel); + return; } - asm_xtensa_op_bccz(as, cond, reg, rel); + + // Range is effectively extended to 18 bits, as a more complex jump code + // sequence is emitted. + if (as->base.pass == MP_ASM_PASS_EMIT && !SIGNED_FIT18(rel - 6)) { + mp_raise_msg_varg(&mp_type_RuntimeError, ET_OUT_OF_RANGE, MP_QSTR_bccz); + } + + // ~BCCZ skip ; +0 <- Condition is flipped here (EQ -> NE, etc.) + // J addr ; +3 + // skip: ; +6 + asm_xtensa_op_bccz(as, cond ^ 1, reg, 6 - 4); + asm_xtensa_op_j(as, rel - 3); } void asm_xtensa_bcc_reg_reg_label(asm_xtensa_t *as, uint cond, uint reg1, uint reg2, uint label) { - uint32_t dest = get_label_dest(as, label); - int32_t rel = dest - as->base.code_offset - 4; - if (as->base.pass == MP_ASM_PASS_EMIT && !SIGNED_FIT8(rel)) { - printf("ERROR: xtensa bcc out of range\n"); + ptrdiff_t rel = 0; + bool can_emit_short_jump = calculate_branch_displacement(as, label, &rel); + + if (can_emit_short_jump && SIGNED_FIT8(rel)) { + // Backwards BCC opcodes with an offset that fits in 8 bits can + // be emitted without any change. + asm_xtensa_op_bcc(as, cond, reg1, reg2, rel); + return; + } + + // Range is effectively extended to 18 bits, as a more complex jump code + // sequence is emitted. + if (as->base.pass == MP_ASM_PASS_EMIT && !SIGNED_FIT18(rel - 6)) { + mp_raise_msg_varg(&mp_type_RuntimeError, ET_OUT_OF_RANGE, MP_QSTR_bcc); } - asm_xtensa_op_bcc(as, cond, reg1, reg2, rel); + + // ~BCC skip ; +0 <- Condition is flipped here (EQ -> NE, etc.) + // J addr ; +3 + // skip: ; +6 + asm_xtensa_op_bcc(as, cond ^ 8, reg1, reg2, 6 - 4); + asm_xtensa_op_j(as, rel - 3); } // convenience function; reg_dest must be different from reg_src[12] @@ -179,6 +230,8 @@ size_t asm_xtensa_mov_reg_i32(asm_xtensa_t *as, uint reg_dest, uint32_t i32) { // store the constant in the table if (as->const_table != NULL) { as->const_table[as->cur_const] = i32; + } else { + assert((as->base.pass != MP_ASM_PASS_EMIT) && "Constants table was not built."); } ++as->cur_const; return loc; @@ -240,7 +293,9 @@ void asm_xtensa_l32i_optimised(asm_xtensa_t *as, uint reg_dest, uint reg_base, u } else if (word_offset < 256) { asm_xtensa_op_l32i(as, reg_dest, reg_base, word_offset); } else { - mp_raise_msg(&mp_type_RuntimeError, MP_ERROR_TEXT("asm overflow")); + asm_xtensa_mov_reg_i32_optimised(as, reg_dest, word_offset * 4); + asm_xtensa_op_add_n(as, reg_dest, reg_base, reg_dest); + asm_xtensa_op_l32i_n(as, reg_dest, reg_dest, 0); } } @@ -250,7 +305,19 @@ void asm_xtensa_s32i_optimised(asm_xtensa_t *as, uint reg_src, uint reg_base, ui } else if (word_offset < 256) { asm_xtensa_op_s32i(as, reg_src, reg_base, word_offset); } else { - mp_raise_msg(&mp_type_RuntimeError, MP_ERROR_TEXT("asm overflow")); + asm_xtensa_mov_reg_i32_optimised(as, REG_TEMP, word_offset * 4); + asm_xtensa_op_add_n(as, REG_TEMP, reg_base, REG_TEMP); + asm_xtensa_op_s32i_n(as, reg_src, REG_TEMP, 0); + } +} + +void asm_xtensa_l16ui_optimised(asm_xtensa_t *as, uint reg_dest, uint reg_base, uint halfword_offset) { + if (halfword_offset < 256) { + asm_xtensa_op_l16ui(as, reg_dest, reg_base, halfword_offset); + } else { + asm_xtensa_mov_reg_i32_optimised(as, reg_dest, halfword_offset * 2); + asm_xtensa_op_add_n(as, reg_dest, reg_base, reg_dest); + asm_xtensa_op_l16ui(as, reg_dest, reg_dest, 0); } } @@ -264,4 +331,47 @@ void asm_xtensa_call_ind_win(asm_xtensa_t *as, uint idx) { asm_xtensa_op_callx8(as, ASM_XTENSA_REG_A8); } +void asm_xtensa_bit_branch(asm_xtensa_t *as, mp_uint_t reg, mp_uint_t bit, mp_uint_t label, mp_uint_t condition) { + uint32_t dest = get_label_dest(as, label); + int32_t rel = dest - as->base.code_offset - 4; + if (as->base.pass == MP_ASM_PASS_EMIT && !SIGNED_FIT8(rel)) { + mp_raise_msg_varg(&mp_type_RuntimeError, ET_OUT_OF_RANGE, MP_QSTR_bit_branch); + } + asm_xtensa_op24(as, ASM_XTENSA_ENCODE_RRI8(7, condition | ((bit >> 4) & 0x01), reg, bit & 0x0F, rel & 0xFF)); +} + +void asm_xtensa_call0(asm_xtensa_t *as, mp_uint_t label) { + uint32_t dest = get_label_dest(as, label); + int32_t rel = dest - as->base.code_offset - 3; + if (as->base.pass == MP_ASM_PASS_EMIT) { + if ((dest & 0x03) != 0) { + mp_raise_msg_varg(&mp_type_RuntimeError, ET_NOT_ALIGNED, MP_QSTR_call0, MP_QSTR_target); + } + if ((rel & 0x03) != 0) { + mp_raise_msg_varg(&mp_type_RuntimeError, ET_NOT_ALIGNED, MP_QSTR_call0, MP_QSTR_location); + } + if (!SIGNED_FIT18(rel)) { + mp_raise_msg_varg(&mp_type_RuntimeError, ET_OUT_OF_RANGE, MP_QSTR_call0); + } + } + asm_xtensa_op_call0(as, rel); +} + +void asm_xtensa_l32r(asm_xtensa_t *as, mp_uint_t reg, mp_uint_t label) { + uint32_t dest = get_label_dest(as, label); + int32_t rel = dest - as->base.code_offset; + if (as->base.pass == MP_ASM_PASS_EMIT) { + if ((dest & 0x03) != 0) { + mp_raise_msg_varg(&mp_type_RuntimeError, ET_NOT_ALIGNED, MP_QSTR_l32r, MP_QSTR_target); + } + if ((rel & 0x03) != 0) { + mp_raise_msg_varg(&mp_type_RuntimeError, ET_NOT_ALIGNED, MP_QSTR_l32r, MP_QSTR_location); + } + if (!SIGNED_FIT18(rel) || (rel >= 0)) { + mp_raise_msg_varg(&mp_type_RuntimeError, ET_OUT_OF_RANGE, MP_QSTR_l32r); + } + } + asm_xtensa_op_l32r(as, reg, as->base.code_offset, dest); +} + #endif // MICROPY_EMIT_XTENSA || MICROPY_EMIT_INLINE_XTENSA || MICROPY_EMIT_XTENSAWIN |