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Diffstat (limited to 'vere/ext/nasm/output/legacy.c')
| -rw-r--r-- | vere/ext/nasm/output/legacy.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/vere/ext/nasm/output/legacy.c b/vere/ext/nasm/output/legacy.c new file mode 100644 index 0000000..15d22e9 --- /dev/null +++ b/vere/ext/nasm/output/legacy.c @@ -0,0 +1,122 @@ +/* ----------------------------------------------------------------------- * + * + * Copyright 2016-2022 The NASM Authors - All Rights Reserved + * See the file AUTHORS included with the NASM distribution for + * the specific copyright holders. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following + * conditions are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials provided + * with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND + * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, + * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR + * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, + * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * ----------------------------------------------------------------------- */ + +/* + * output/legacy.c + * + * Mangle a struct out_data to match the rather bizarre legacy + * backend interface. + * + * The "data" parameter for the output function points to a "int64_t", + * containing the address of the target in question, unless the type is + * OUT_RAWDATA, in which case it points to an "uint8_t" + * array. + * + * Exceptions are OUT_RELxADR, which denote an x-byte relocation + * which will be a relative jump. For this we need to know the + * distance in bytes from the start of the relocated record until + * the end of the containing instruction. _This_ is what is stored + * in the size part of the parameter, in this case. + * + * Also OUT_RESERVE denotes reservation of N bytes of BSS space, + * and the contents of the "data" parameter is irrelevant. + */ + +#include "nasm.h" +#include "outlib.h" + +void nasm_do_legacy_output(const struct out_data *data) +{ + const void *dptr = data->data; + enum out_type type = data->type; + int32_t tsegment = data->tsegment; + int32_t twrt = data->twrt; + uint64_t size = data->size; + + switch (data->type) { + case OUT_RELADDR: + switch (data->size) { + case 1: + type = OUT_REL1ADR; + break; + case 2: + type = OUT_REL2ADR; + break; + case 4: + type = OUT_REL4ADR; + break; + case 8: + type = OUT_REL8ADR; + break; + default: + panic(); + break; + } + + dptr = &data->toffset; + size = data->relbase - data->offset; + break; + + case OUT_SEGMENT: + type = OUT_ADDRESS; + tsegment |= 1; + /* fall through */ + + case OUT_ADDRESS: + dptr = &data->toffset; + size = (data->flags & OUT_SIGNED) ? -data->size : data->size; + break; + + case OUT_RAWDATA: + case OUT_RESERVE: + tsegment = twrt = NO_SEG; + break; + + case OUT_ZERODATA: + tsegment = twrt = NO_SEG; + type = OUT_RAWDATA; + dptr = zero_buffer; + while (size > ZERO_BUF_SIZE) { + ofmt->legacy_output(data->segment, dptr, type, + ZERO_BUF_SIZE, tsegment, twrt); + size -= ZERO_BUF_SIZE; + } + break; + + default: + panic(); + break; + } + + ofmt->legacy_output(data->segment, dptr, type, size, tsegment, twrt); +} |