mirror of
https://github.com/netwide-assembler/nasm.git
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bff94fbd39
Work through a number of changes toward making matching a lot saner, both to reduce the number of patterns to generate for APX but also to make a number of code patterns simpler. This replaces a fair number of byte codes. Improve a number of error messages, especially related to overflows. Move process_insn() from nasm.c to assemble.c, as it really is the primary entry point to the assembler module. Reorder some prefixes. In particular, F2/F3 override 66 when used as a mandatory prefix, so it makes more sense for them to be closer to the opcode. Move a lot more information into struct insn. It is better to have it in one place; memory consumption is not an issue because struct insn is transient information. Get rid of "optimization levels" and replace it with a mask of flags. That was already halfway done; complete the job. Replace seg:offset in struct out_data with a struct location. It would be better to extend this to more places, too. The ARx and SMx flags are now explicit bitmasks, instead of having a couple of hard-coded ranges. Add __func__ to assert or panic messages. Because of prefix and message changes, a number of travis tests had to be audited and updated. Fix a number of instruction patterns which had .128 when they ought to be .lig. This is no longer a minor issue with the disassembler: for AVX10, the pattern vector length determines how SAE/RC are encoded, and there is no valid 128-bit encoding. However, with .lig the 512-bit encoding can be used. Separate "o64nw" into two pieces: opsize 64 and "nw" = "REX.w not necessary". The latter can be included in non-64-bit patterns. "o64" still set REX.W since that is still the common thing. New "osz" bytecode: emit an OSP *or* REX.W depending on the current mode and operand size. Useful for special cases like "nop" where "o64 nop" probably wants to be encoded as "48 90". Signed-off-by: H. Peter Anvin <hpa@zytor.com>
126 lines
4.1 KiB
C
126 lines
4.1 KiB
C
/* ----------------------------------------------------------------------- *
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*
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* Copyright 2016-2024 The NASM Authors - All Rights Reserved
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* See the file AUTHORS included with the NASM distribution for
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* the specific copyright holders.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following
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* conditions are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* ----------------------------------------------------------------------- */
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/*
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* output/legacy.c
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*
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* Mangle a struct out_data to match the rather bizarre legacy
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* backend interface.
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*
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* The "data" parameter for the output function points to a "int64_t",
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* containing the address of the target in question, unless the type is
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* OUT_RAWDATA, in which case it points to an "uint8_t"
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* array.
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*
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* Exceptions are OUT_RELxADR, which denote an x-byte relocation
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* which will be a relative jump. For this we need to know the
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* distance in bytes from the start of the relocated record until
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* the end of the containing instruction. _This_ is what is stored
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* in the size part of the parameter, in this case.
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*
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* Also OUT_RESERVE denotes reservation of N bytes of BSS space,
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* and the contents of the "data" parameter is irrelevant.
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*/
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#include "nasm.h"
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#include "outlib.h"
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void nasm_do_legacy_output(const struct out_data *data)
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{
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const void *dptr = data->data;
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enum out_type type = data->type;
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int32_t tsegment = data->tsegment;
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int32_t twrt = data->twrt;
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uint64_t size = data->size;
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switch (data->type) {
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case OUT_RELADDR:
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switch (data->size) {
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case 1:
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type = OUT_REL1ADR;
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break;
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case 2:
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type = OUT_REL2ADR;
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break;
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case 4:
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type = OUT_REL4ADR;
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break;
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case 8:
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type = OUT_REL8ADR;
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break;
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default:
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panic();
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break;
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}
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dptr = &data->toffset;
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size = data->relbase - data->loc.offset;
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break;
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case OUT_SEGMENT:
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type = OUT_ADDRESS;
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if (tsegment != NO_SEG && tsegment < SEG_ABS)
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tsegment |= 1;
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dptr = zero_buffer;
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size = data->size;
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break;
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case OUT_ADDRESS:
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dptr = &data->toffset;
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size = (data->flags & OUT_SIGNED) ? -data->size : data->size;
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break;
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case OUT_RAWDATA:
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case OUT_RESERVE:
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tsegment = twrt = NO_SEG;
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break;
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case OUT_ZERODATA:
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tsegment = twrt = NO_SEG;
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type = OUT_RAWDATA;
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dptr = zero_buffer;
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while (size > ZERO_BUF_SIZE) {
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ofmt->legacy_output(data->loc.segment, dptr, type,
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ZERO_BUF_SIZE, tsegment, twrt);
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size -= ZERO_BUF_SIZE;
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}
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break;
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default:
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panic();
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break;
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}
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ofmt->legacy_output(data->loc.segment, dptr, type, size, tsegment, twrt);
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}
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