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Diffstat (limited to 'py/asmbase.c')
| -rw-r--r-- | py/asmbase.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/py/asmbase.c b/py/asmbase.c new file mode 100644 index 0000000000..916f7c5ec8 --- /dev/null +++ b/py/asmbase.c @@ -0,0 +1,104 @@ +/* + * This file is part of the MicroPython project, http://micropython.org/ + * + * The MIT License (MIT) + * + * Copyright (c) 2016 Damien P. George + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +#include <assert.h> +#include <string.h> + +#include "py/obj.h" +#include "py/misc.h" +#include "py/asmbase.h" + +#if MICROPY_EMIT_NATIVE || MICROPY_EMIT_INLINE_THUMB + +void mp_asm_base_init(mp_asm_base_t *as, size_t max_num_labels) { + as->max_num_labels = max_num_labels; + as->label_offsets = m_new(size_t, max_num_labels); +} + +void mp_asm_base_deinit(mp_asm_base_t *as, bool free_code) { + if (free_code) { + MP_PLAT_FREE_EXEC(as->code_base, as->code_size); + } + m_del(size_t, as->label_offsets, as->max_num_labels); +} + +void mp_asm_base_start_pass(mp_asm_base_t *as, int pass) { + if (pass == MP_ASM_PASS_COMPUTE) { + // reset all labels + memset(as->label_offsets, -1, as->max_num_labels * sizeof(size_t)); + } else if (pass == MP_ASM_PASS_EMIT) { + // allocating executable RAM is platform specific + MP_PLAT_ALLOC_EXEC(as->code_offset, (void**)&as->code_base, &as->code_size); + assert(as->code_base != NULL); + } + as->pass = pass; + as->code_offset = 0; +} + +// all functions must go through this one to emit bytes +// if as->pass < MP_ASM_PASS_EMIT, then this function returns dummy_data +uint8_t *mp_asm_base_get_cur_to_write_bytes(mp_asm_base_t *as, size_t num_bytes_to_write) { + if (as->pass < MP_ASM_PASS_EMIT) { + as->code_offset += num_bytes_to_write; + return as->dummy_data; + } else { + assert(as->code_offset + num_bytes_to_write <= as->code_size); + uint8_t *c = as->code_base + as->code_offset; + as->code_offset += num_bytes_to_write; + return c; + } +} + +void mp_asm_base_label_assign(mp_asm_base_t *as, size_t label) { + assert(label < as->max_num_labels); + if (as->pass < MP_ASM_PASS_EMIT) { + // assign label offset + assert(as->label_offsets[label] == (size_t)-1); + as->label_offsets[label] = as->code_offset; + } else { + // ensure label offset has not changed from PASS_COMPUTE to PASS_EMIT + assert(as->label_offsets[label] == as->code_offset); + } +} + +// align must be a multiple of 2 +void mp_asm_base_align(mp_asm_base_t* as, unsigned int align) { + as->code_offset = (as->code_offset + align - 1) & (~(align - 1)); +} + +// this function assumes a little endian machine +void mp_asm_base_data(mp_asm_base_t* as, unsigned int bytesize, uintptr_t val) { + uint8_t *c = mp_asm_base_get_cur_to_write_bytes(as, bytesize); + // only write to the buffer in the emit pass (otherwise we may overflow dummy_data) + if (as->pass == MP_ASM_PASS_EMIT) { + for (unsigned int i = 0; i < bytesize; i++) { + *c++ = val; + val >>= 8; + } + } +} + +#endif // MICROPY_EMIT_NATIVE || MICROPY_EMIT_INLINE_THUMB |