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| author | Damien George <damien.p.george@gmail.com> | 2015-02-12 22:52:42 +0000 |
|---|---|---|
| committer | Damien George <damien.p.george@gmail.com> | 2015-02-12 22:52:42 +0000 |
| commit | 1bf5a022fe37d40604734c28794b402cd8c935e2 (patch) | |
| tree | 9dd40ef2e903431c47d5a2e0440d632b2d56cf1c /py | |
| parent | 91fc4a9ce13311bc5c3bdcd5ddaf75795f8a46b5 (diff) | |
| download | micropython-1bf5a022fe37d40604734c28794b402cd8c935e2.tar.gz micropython-1bf5a022fe37d40604734c28794b402cd8c935e2.zip | |
py: Add ldrex and strex to thumb2 inline assembler.
These are useful for implementing atomic lock operations.
Diffstat (limited to 'py')
| -rw-r--r-- | py/emitinlinethumb.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/py/emitinlinethumb.c b/py/emitinlinethumb.c index 669929b0d1..eaa3475b86 100644 --- a/py/emitinlinethumb.c +++ b/py/emitinlinethumb.c @@ -397,6 +397,14 @@ STATIC void emit_inline_thumb_op(emit_inline_asm_t *emit, qstr op, mp_uint_t n_a } else if (strcmp(op_str, "strh") == 0) { op_code = ASM_THUMB_FORMAT_10_STRH; goto op_format_9_10; + } else if (strcmp(op_str, "ldrex") == 0) { + mp_uint_t r_dest = get_arg_reg(emit, op_str, pn_args[0], 15); + mp_parse_node_t pn_base, pn_offset; + if (get_arg_addr(emit, op_str, pn_args[1], &pn_base, &pn_offset)) { + mp_uint_t r_base = get_arg_reg(emit, op_str, pn_base, 15); + mp_uint_t i8 = get_arg_i(emit, op_str, pn_offset, 0xff) >> 2; + asm_thumb_op32(emit->as, 0xe850 | r_base, 0x0f00 | (r_dest << 12) | i8); + } } else { goto unknown_op; } @@ -422,6 +430,15 @@ STATIC void emit_inline_thumb_op(emit_inline_asm_t *emit, qstr op, mp_uint_t n_a } else if (strcmp(op_str, "sub") == 0) { op_code = ASM_THUMB_FORMAT_2_SUB; goto op_format_2; + } else if (strcmp(op_str, "strex") == 0) { + mp_uint_t r_dest = get_arg_reg(emit, op_str, pn_args[0], 15); + mp_uint_t r_src = get_arg_reg(emit, op_str, pn_args[1], 15); + mp_parse_node_t pn_base, pn_offset; + if (get_arg_addr(emit, op_str, pn_args[2], &pn_base, &pn_offset)) { + mp_uint_t r_base = get_arg_reg(emit, op_str, pn_base, 15); + mp_uint_t i8 = get_arg_i(emit, op_str, pn_offset, 0xff) >> 2; + asm_thumb_op32(emit->as, 0xe840 | r_base, (r_src << 12) | (r_dest << 8) | i8); + } } else { goto unknown_op; } |