From 84df756fafb18da3ecb4526155e4326640284aba Mon Sep 17 00:00:00 2001 From: Nunuhara Cabbage Date: Sun, 6 Oct 2019 18:26:59 -0700 Subject: [PATCH] Initial commit An assortment of instructions have been implemented so far, mostly basic stuff such as stack management. The following program can be executed: int main(void) { hello(2); for (;;) { system.Peek(); system.Sleep(1); } return 0; } void hello(int n) { int i; for (i = 0; i < n; i++) { system.Output("Hello, world! " + string(i)); } } --- .gitignore | 2 + COPYING | 339 ++++++++++++++++++++++++++++++++++++ README.md | 24 +++ ain.c | 445 ++++++++++++++++++++++++++++++++++++++++++++++++ ain.h | 182 ++++++++++++++++++++ instructions.c | 293 +++++++++++++++++++++++++++++++ instructions.h | 304 +++++++++++++++++++++++++++++++++ little_endian.h | 64 +++++++ meson.build | 4 + string.c | 62 +++++++ sys4_string.h | 34 ++++ system4.c | 101 +++++++++++ system4.h | 65 +++++++ vm.c | 329 +++++++++++++++++++++++++++++++++++ 14 files changed, 2248 insertions(+) create mode 100644 .gitignore create mode 100644 COPYING create mode 100644 README.md create mode 100644 ain.c create mode 100644 ain.h create mode 100644 instructions.c create mode 100644 instructions.h create mode 100644 little_endian.h create mode 100644 meson.build create mode 100644 string.c create mode 100644 sys4_string.h create mode 100644 system4.c create mode 100644 system4.h create mode 100644 vm.c diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..364ff39 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +build +*.ain \ No newline at end of file diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..d159169 --- /dev/null +++ b/COPYING @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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Of course, the commands you use may +be called something other than `show w' and `show c'; they could even be +mouse-clicks or menu items--whatever suits your program. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the program + `Gnomovision' (which makes passes at compilers) written by James Hacker. + + , 1 April 1989 + Ty Coon, President of Vice + +This General Public License does not permit incorporating your program into +proprietary programs. If your program is a subroutine library, you may +consider it more useful to permit linking proprietary applications with the +library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. diff --git a/README.md b/README.md new file mode 100644 index 0000000..bc656ac --- /dev/null +++ b/README.md @@ -0,0 +1,24 @@ +xsystem4 +======== + +xsystem4 is an implementation of AliceSoft's System 4 game engine for unix-like +operating systems. + +NOTE: This is a work in progress. Very little is implemented so far. + +Building +-------- + +xsystem4 uses the meson build system. + + mkdir build + meson build + ninja -C build + +Running +------- + +You will need to create an AIN file using the System 4 SDK compiler. Then simply +pass it to the system4 executable. + + build/system4 ???.ain diff --git a/ain.c b/ain.c new file mode 100644 index 0000000..8fac4fa --- /dev/null +++ b/ain.c @@ -0,0 +1,445 @@ +/* Copyright (C) 2019 Nunuhara Cabbage + * + * Credit to SLC for reverse engineering AIN formats. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see . + */ + +#include +#include +#include +#include +#include +#include +#include + +#include "system4.h" +#include "ain.h" +#include "little_endian.h" +#include "instructions.h" + +static const char *errtab[AIN_MAX_ERROR] = { + [AIN_SUCCESS] = "Success", + [AIN_FILE_ERROR] = "Error opening AIN file", + [AIN_UNRECOGNIZED_FORMAT] = "Unrecognized or invalid AIN format", + [AIN_INVALID] = "Invalid AIN file" +}; + +const char *ain_strerror(int error) +{ + if (error < AIN_MAX_ERROR) + return errtab[error]; + return "Invalid error code"; +} + +struct ain_reader { + uint8_t *buf; + size_t size; + size_t index; +}; + +static int32_t read_int32(struct ain_reader *r) +{ + int32_t v = LittleEndian_getDW(r->buf, r->index); + r->index += 4; + return v; +} + +static uint8_t *read_bytes(struct ain_reader *r, size_t len) +{ + uint8_t *bytes = xmalloc(len); + memcpy(bytes, r->buf + r->index, len); + r->index += len; + return bytes; +} + +static char *read_string(struct ain_reader *r) +{ + char *str = strdup((char*)r->buf + r->index); + r->index += strlen(str) + 1; + return str; +} + +// TODO: should just memcpy the whole section and create pointers into it +// e.g. char *_messages; // raw AIN section +// char **messages; // array of pointers into _messages +static char **read_strings(struct ain_reader *r, int count) +{ + char **strings = calloc(count, sizeof(char*)); + for (int i = 0; i < count; i++) { + strings[i] = read_string(r); + } + return strings; +} + +static struct ain_variable *read_variables(struct ain_reader *r, int count) +{ + struct ain_variable *variables = calloc(count, sizeof(struct ain_variable)); + for (int i = 0; i < count; i++) { + variables[i].name = read_string(r); + variables[i].data_type = read_int32(r); + variables[i].struct_type = read_int32(r); + variables[i].array_dimensions = read_int32(r); + } + return variables; +} + +static struct ain_function *read_functions(struct ain_reader *r, int count, struct ain *ain) +{ + struct ain_function *funs = calloc(count, sizeof(struct ain_function)); + for (int i = 0; i < count; i++) { + funs[i].address = read_int32(r); + funs[i].name = read_string(r); + if (ain->version > 0 && ain->version < 7) { + funs[i].is_label = read_int32(r); + } + funs[i].data_type = read_int32(r); + funs[i].struct_type = read_int32(r); + funs[i].nr_args = read_int32(r); + funs[i].nr_vars = read_int32(r); + if (ain->version > 0) { + funs[i].crc = read_int32(r); + } + if (funs[i].nr_vars > 0) { + funs[i].vars = read_variables(r, funs[i].nr_vars); + } + } + return funs; +} + +static struct ain_global *read_globals(struct ain_reader *r, int count, struct ain *ain) +{ + struct ain_global *globals = calloc(count, sizeof(struct ain_global)); + for (int i = 0; i < count; i++) { + globals[i].name = read_string(r); + globals[i].data_type = read_int32(r); + globals[i].struct_type = read_int32(r); + globals[i].array_dimensions = read_int32(r); + if (ain->version >= 5) { + globals[i].group_index = read_int32(r); + } + } + return globals; +} + +static struct ain_initval *read_initvals(struct ain_reader *r, int count) +{ + struct ain_initval *values = calloc(count, sizeof(struct ain_initval)); + for (int i = 0; i < count; i++) { + values[i].global_index = read_int32(r); + values[i].data_type = read_int32(r); + if (values[i].data_type == AIN_STRING) { + values[i].string_value = read_string(r); + } else { + values[i].int_value = read_int32(r); + } + } + return values; +} + +static struct ain_struct *read_structures(struct ain_reader *r, int count) +{ + struct ain_struct *structures = calloc(count, sizeof(struct ain_struct)); + for (int i = 0; i < count; i++) { + structures[i].name = read_string(r); + structures[i].constructor = read_int32(r); + structures[i].destructor = read_int32(r); + structures[i].nr_members = read_int32(r); + structures[i].members = read_variables(r, structures[i].nr_members); + } + return structures; +} + +static struct ain_hll_argument *read_hll_arguments(struct ain_reader *r, int count) +{ + struct ain_hll_argument *arguments = calloc(count, sizeof(struct ain_hll_argument)); + for (int i = 0; i < count; i++) { + arguments[i].name = read_string(r); + arguments[i].data_type = read_int32(r); + } + return arguments; +} + +static struct ain_hll_function *read_hll_functions(struct ain_reader *r, int count) +{ + struct ain_hll_function *functions = calloc(count, sizeof(struct ain_hll_function)); + for (int i = 0; i < count; i++) { + functions[i].name = read_string(r); + functions[i].data_type = read_int32(r); + functions[i].nr_arguments = read_int32(r); + functions[i].arguments = read_hll_arguments(r, functions[i].nr_arguments); + } + return functions; +} + +static struct ain_library *read_libraries(struct ain_reader *r, int count) +{ + struct ain_library *libraries = calloc(count, sizeof(struct ain_library)); + for (int i = 0; i < count; i++) { + libraries[i].name = read_string(r); + libraries[i].nr_functions = read_int32(r); + libraries[i].functions = read_hll_functions(r, libraries[i].nr_functions); + } + return libraries; +} + +static struct ain_switch_case *read_switch_cases(struct ain_reader *r, int count) +{ + struct ain_switch_case *cases = calloc(count, sizeof(struct ain_switch)); + for (int i = 0; i < count; i++) { + cases[i].value = read_int32(r); + cases[i].address = read_int32(r); + } + return cases; +} + +static struct ain_switch *read_switches(struct ain_reader *r, int count) +{ + struct ain_switch *switches = calloc(count, sizeof(struct ain_switch)); + for (int i = 0; i < count; i++) { + switches[i].case_type = read_int32(r); + switches[i].default_address = read_int32(r); + switches[i].nr_cases = read_int32(r); + switches[i].cases = read_switch_cases(r, switches[i].nr_cases); + } + return switches; +} + +static struct ain_function_type *read_function_types(struct ain_reader *r, int count) +{ + struct ain_function_type *types = calloc(count, sizeof(struct ain_function_type)); + for (int i = 0; i < count; i++) { + types[i].name = read_string(r); + types[i].data_type = read_int32(r); + types[i].struct_type = read_int32(r); + types[i].nr_arguments = read_int32(r); + types[i].nr_variables = read_int32(r); + types[i].variables = read_variables(r, types[i].nr_variables); + } + return types; +} + +static bool read_tag(struct ain_reader *r, struct ain *ain) +{ + uint8_t *tag_loc = r->buf + r->index; + r->index += 4; + +#define TAG_EQ(tag) !strncmp((char*)tag_loc, tag, 4) + // FIXME: need to check len or could segfault on currupt AIN file + if (TAG_EQ("VERS")) { + ain->version = read_int32(r); + } else if (TAG_EQ("KEYC")) { + ain->keycode = read_int32(r); + } else if (TAG_EQ("CODE")) { + ain->code_size = read_int32(r); + ain->code = read_bytes(r, ain->code_size); + } else if (TAG_EQ("FUNC")) { + int32_t count = read_int32(r); + ain->functions = read_functions(r, count, ain); + } else if (TAG_EQ("GLOB")) { + int32_t count = read_int32(r); + ain->globals = read_globals(r, count, ain); + } else if (TAG_EQ("GSET")) { + int32_t count = read_int32(r); + ain->global_initvals = read_initvals(r, count); + } else if (TAG_EQ("STRT")) { + int32_t count = read_int32(r); + ain->structures = read_structures(r, count); + } else if (TAG_EQ("MSG0")) { + ain->messages = read_strings(r, read_int32(r)); + } else if (TAG_EQ("MAIN")) { + ain->main = read_int32(r); + } else if (TAG_EQ("MSGF")) { + ain->msgf = read_int32(r); + } else if (TAG_EQ("HLL0")) { + int32_t count = read_int32(r); + ain->libraries = read_libraries(r, count); + } else if (TAG_EQ("SWI0")) { + int32_t count = read_int32(r); + ain->switches = read_switches(r, count); + } else if (TAG_EQ("GVER")) { + ain->game_version = read_int32(r); + } else if (TAG_EQ("STR0")) { + ain->strings = read_strings(r, read_int32(r)); + } else if (TAG_EQ("FNAM")) { + ain->filenames = read_strings(r, read_int32(r)); + } else if (TAG_EQ("OJMP")) { + ain->ojmp = read_int32(r); + } else if (TAG_EQ("FNCT")) { + //int32_t length = read_int32(r) - 4; // ??? + read_int32(r); + int32_t count = read_int32(r); + ain->function_types = read_function_types(r, count); + //} else if (TAG_EQ("DELG")) { + } else if (TAG_EQ("OBJG")) { + ain->global_group_names = read_strings(r, read_int32(r)); + //} else if (TAG_EQ("MSG1")) { + } else { + return false; + } +#undef TAG_EQ + + return true; +} + +static uint8_t *decompress_ain(uint8_t *in, long *len) +{ + uint8_t *out; + long out_len = LittleEndian_getDW(in, 8); + long in_len = LittleEndian_getDW(in, 12); + + if (out_len < 0 || in_len < 0) + return NULL; + + out = xmalloc(out_len); + if (Z_OK != uncompress(out, (unsigned long*)&out_len, in+16, in_len)) { + free(out); + return NULL; + } + + *len = out_len; + return out; +} + +static uint32_t temper(uint32_t in) +{ + in ^= (in >> 11); + in ^= (in << 7) & 0x9D2C5680; + in ^= (in << 15) & 0xEFC60000; + in ^= (in >> 18); + return in; +} + +static void update(uint32_t *state) +{ + int ahead = 0x18D; + int write = 0; + int read = 2; + uint32_t current = state[1]; + uint32_t last = state[0]; + uint32_t tmp; + + for (int i = 0; i < 0x270; i++) { + tmp = (((current ^ last) & 0x7FFFFFFE) ^ last) >> 1; + tmp = (current & 1) ? (tmp ^ 0x9908B0DF) : tmp; + state[write] = tmp ^ state[ahead]; + last = current; + current = state[read]; + write++; + read++; + ahead++; + while (read >= 0x270) + read -= 0x270; + while (ahead >= 0x270) + ahead -= 0x270; + } +} + +static void decrypt_ain(uint8_t *buf, size_t len) +{ + uint32_t state[0x270]; + uint32_t key = 0x5D3E3; + int off = 0; + + for (int i = 0; i < 0x270; i++) { + state[i] = key; + key *= 0x10DCD; + } + + update(state); + for (size_t i = 0; i < len; i++) { + if (off >= 0x270) { + update(state); + off = 0; + } + buf[i] ^= (uint8_t)(temper(state[off]) & 0xFF); + off++; + } +} + +static bool ain_is_encrypted(uint8_t *buf) +{ + uint8_t magic[8]; + + memcpy(magic, buf, 8); + decrypt_ain(magic, 8); + + return !strncmp((char*)magic, "VERS", 4) && !magic[5] && !magic[6] && !magic[7]; +} + +struct ain *ain_open(const char *path, int *error) +{ + FILE *fp; + long len; + uint8_t *buf = NULL; + struct ain *ain = NULL; + + if (!(fp = fopen(path, "rb"))) { + *error = AIN_FILE_ERROR; + goto err; + } + + // get size of AIN file + fseek(fp, 0, SEEK_END); + len = ftell(fp); + fseek(fp, 0, SEEK_SET); + + // read AIN file into memory + buf = xmalloc(len + 4); // why +4? + fread(buf, 1, len, fp); + fclose(fp); + + // check magic + if (!strncmp((char*)buf, "AI2\0\0\0\0", 8)) { + uint8_t *uc = decompress_ain(buf, &len); + if (!uc) { + *error = AIN_INVALID; + goto err; + } + free(buf); + buf = uc; + } else if (ain_is_encrypted(buf)) { + decrypt_ain(buf, len); + } else { + printf("%.4s\n", buf); + *error = AIN_UNRECOGNIZED_FORMAT; + goto err; + } + + // read data into ain struct + struct ain_reader r = { + .buf = buf, + .index = 0, + .size = len + }; + ain = calloc(1, sizeof(struct ain)); + while (read_tag(&r, ain)); + if (!ain->version) { + *error = AIN_INVALID; + goto err; + } + + free(buf); + *error = AIN_SUCCESS; + return ain; +err: + free(buf); + free(ain); + return NULL; +} + +void ain_free(struct ain *ain) +{ + free(ain); +} diff --git a/ain.h b/ain.h new file mode 100644 index 0000000..e7cf2bc --- /dev/null +++ b/ain.h @@ -0,0 +1,182 @@ +/* Copyright (C) 2019 Nunuhara Cabbage + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see . + */ + +#ifndef SYSTEM4_AIN_H +#define SYSTEM4_AIN_H + +#include +#include +#include + +struct ain; + +enum ain_error { + AIN_SUCCESS, + AIN_FILE_ERROR, + AIN_UNRECOGNIZED_FORMAT, + AIN_INVALID, + AIN_MAX_ERROR +}; + +enum ain_data_type { + AIN_VOID = 0, + AIN_INT = 10, + AIN_FLOAT = 11, + AIN_STRING = 12, + AIN_STRUCT = 13, + AIN_ARRAY_INT = 14, + AIN_ARRAY_FLOAT = 15, + AIN_ARRAY_STRING = 16, + AIN_ARRAY_STRUCT = 17, + AIN_REF_INT = 18, + AIN_REF_FLOAT = 19, + AIN_REF_STRING = 20, + AIN_REF_STRUCT = 21, + AIN_REF_ARRAY_INT = 22, + AIN_REF_ARRAY_FLOAT = 23, + AIN_REF_ARRAY_STRING = 24, + AIN_REF_ARRAY_STRUCT = 25, + AIN_IMAIN_SYSTEM = 26, + AIN_FUNC_TYPE = 27, + AIN_ARRAY_FUNC_TYPE = 30, + AIN_REF_FUNC_TYPE = 31, + AIN_REF_ARRAY_FUNC_TYPE = 32, + AIN_BOOL = 47, + AIN_ARRAY_BOOL = 50, + AIN_REF_BOOL = 51, + AIN_REF_ARRAY_BOOL = 52, + AIN_LONG_INT = 55, + AIN_ARRAY_LONG_INT = 58, + AIN_REF_LONG_INT = 59, + AIN_REF_ARRAY_LONG_INT = 60, + AIN_DELEGATE = 63, + AIN_ARRAY_DELEGATE = 66, + AIN_REF_ARRAY_DELEGATE = 69 +}; + +struct ain_variable { + char *name; + int32_t data_type; + int32_t struct_type; + int32_t array_dimensions; +}; + +struct ain_function { + int32_t address; + char *name; + bool is_label; + int32_t data_type; + int32_t struct_type; + int32_t nr_args; + int32_t nr_vars; + int32_t crc; + struct ain_variable *vars; +}; + +struct ain_global { + char *name; + int32_t data_type; + int32_t struct_type; + int32_t array_dimensions; + int32_t group_index; +}; + +struct ain_initval { + int32_t global_index; + int32_t data_type; + union { + char *string_value; + int32_t int_value; + }; +}; + +struct ain_struct { + char *name; + int32_t constructor; + int32_t destructor; + int32_t nr_members; + struct ain_variable *members; +}; + +struct ain_hll_argument { + char *name; + int32_t data_type; +}; + +struct ain_hll_function { + char *name; + int32_t data_type; + int32_t nr_arguments; + struct ain_hll_argument *arguments; +}; + +struct ain_library { + char *name; + int32_t nr_functions; + struct ain_hll_function *functions; +}; + +struct ain_switch_case { + int32_t value; + int32_t address; +}; + +struct ain_switch { + int32_t case_type; + int32_t default_address; + int32_t nr_cases; + struct ain_switch_case *cases; +}; + +struct ain_function_type { + char *name; + int32_t data_type; + int32_t struct_type; + int32_t nr_arguments; + int32_t nr_variables; + struct ain_variable *variables; +}; + +struct ain { + char *ain_path; + int32_t version; + int32_t keycode; + uint8_t *code; + size_t code_size; + struct ain_function *functions; + struct ain_global *globals; + struct ain_initval *global_initvals; + struct ain_struct *structures; + char **messages; + int32_t main; + int32_t msgf; + struct ain_library *libraries; + struct ain_switch *switches; + int32_t game_version; + char **strings; + char **filenames; + int32_t ojmp; + struct ain_function_type *function_types; + //delegates + char **global_group_names; +}; + +const char *ain_strerror(int error); +struct ain *ain_open(const char *path, int *error); +void ain_free(struct ain *ain); +void vm_execute(struct ain *program); + +#endif /* SYSTEM4_AIN_H */ diff --git a/instructions.c b/instructions.c new file mode 100644 index 0000000..e4bb48e --- /dev/null +++ b/instructions.c @@ -0,0 +1,293 @@ +/* Copyright (C) 2019 Nunuhara Cabbage + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see . + */ + +#include +#include +#include + +#include "system4.h" +#include "instructions.h" + +// JMP = instruction that modifies the instruction pointer +// OP = everything else +#define OP(code, args) [code] = { .opcode = code, .name = #code , .nr_args = args, .ip_inc = 2 + args * 4 } +#define JMP(code, args) [code] = { .opcode = code, .name = #code , .nr_args = args, .ip_inc = 0 } + +const struct instruction instructions[NR_OPCODES] = { + OP(PUSH, 1), + OP(POP, 0), + OP(REF, 0), + OP(REFREF, 0), + OP(PUSHGLOBALPAGE, 0), + OP(PUSHLOCALPAGE, 0), + OP(INV, 0), + OP(NOT, 0), + OP(COMPL, 0), + OP(ADD, 0), + OP(SUB, 0), + OP(MUL, 0), + OP(DIV, 0), + OP(MOD, 0), + OP(AND, 0), + OP(OR, 0), + OP(XOR, 0), + OP(LSHIFT, 0), + OP(RSHIFT, 0), + OP(LT, 0), + OP(GT, 0), + OP(LTE, 0), + OP(GTE, 0), + OP(NOTE, 0), + OP(EQUALE, 0), + OP(ASSIGN, 0), + OP(PLUSA, 0), + OP(MINUSA, 0), + OP(MULA, 0), + OP(DIVA, 0), + OP(MODA, 0), + OP(ANDA, 0), + OP(ORA, 0), + OP(XORA, 0), + + OP(LSHIFTA, 0), + OP(RSHIFTA, 0), + + OP(F_ASSIGN, 0), + OP(F_PLUSA, 0), + OP(F_MINUSA, 0), + OP(F_MULA, 0), + OP(F_DIVA, 0), + OP(DUP2, 0), + OP(DUP_X2, 0), + + OP(CMP, 0), + + JMP(JUMP, 1), + JMP(IFZ, 1), + JMP(IFNZ, 1), + JMP(RETURN, 0), + JMP(CALLFUNC, 1), + OP(INC, 0), + OP(DEC, 0), + OP(FTOI, 0), + OP(ITOF, 0), + OP(F_INV, 0), + OP(F_ADD, 0), + OP(F_SUB, 0), + OP(F_MUL, 0), + OP(F_DIV, 0), + OP(F_LT, 0), + OP(F_GT, 0), + OP(F_LTE, 0), + OP(F_GTE, 0), + OP(F_NOTE, 0), + OP(F_EQUALE, 0), + OP(F_PUSH, 0), + OP(S_PUSH, 1), + OP(S_POP, 0), + OP(S_ADD, 0), + OP(S_ASSIGN, 0), + OP(S_PLUSA, 0), + OP(S_REF, 0), + OP(S_REFREF, 0), + OP(S_NOTE, 0), + OP(S_EQUALE, 0), + OP(SF_CREATE, 0), + OP(SF_CREATEPIXEL, 0), + OP(SF_CREATEALPHA, 0), + + OP(SR_POP, 0), + OP(SR_ASSIGN, 0), + OP(SR_REF, 0), + OP(SR_REFREF, 0), + OP(A_ALLOC, 0), + OP(A_REALLOC, 0), + OP(A_FREE, 0), + OP(A_NUMOF, 0), + OP(A_COPY, 0), + OP(A_FILL, 0), + OP(C_REF, 0), + OP(C_ASSIGN, 0), + OP(MSG, 0), + OP(CALLHLL, 0), + OP(PUSHSTRUCTPAGE, 0), + OP(CALLMETHOD, 0), + OP(SH_GLOBALREF, 1), + OP(SH_LOCALREF, 1), + OP(SWITCH, 0), + OP(STRSWITCH, 0), + OP(FUNC, 1), + OP(_EOF, 1), + OP(CALLSYS, 1), + OP(SJUMP, 0), + OP(CALLONJUMP, 0), + OP(SWAP, 0), + OP(SH_STRUCTREF, 0), + OP(S_LENGTH, 0), + OP(S_LENGTHBYTE, 0), + OP(I_STRING, 0), + OP(CALLFUNC2, 0), + OP(DUP2_X1, 0), + OP(R_ASSIGN, 0), + OP(FT_ASSIGNS, 0), + OP(ASSERT, 0), + OP(S_LT, 0), + OP(S_GT, 0), + OP(S_LTE, 0), + OP(S_GTE, 0), + OP(S_LENGTH2, 0), + OP(S_LENGTHBYTE2, 0), + OP(NEW, 0), + OP(DELETE, 0), + OP(CHECKUDO, 0), + OP(A_REF, 0), + OP(DUP, 0), + OP(DUP_U2, 0), + OP(SP_INC, 0), + OP(SP_DEC, 0), + OP(ENDFUNC, 1), + OP(R_EQUALE, 0), + OP(R_NOTE, 0), + OP(SH_LOCALCREATE, 0), + OP(SH_LOCALDELETE, 0), + OP(STOI, 0), + OP(A_PUSHBACK, 0), + OP(A_POPBACK, 0), + OP(S_EMPTY, 0), + OP(A_EMPTY, 0), + OP(A_ERASE, 0), + OP(A_INSERT, 0), + OP(SH_LOCALINC, 1), + OP(SH_LOCALDEC, 1), + OP(SH_LOCALASSIGN, 2), + OP(ITOB, 0), + OP(S_FIND, 0), + OP(S_GETPART, 0), + OP(A_SORT, 0), + OP(S_PUSHBACK, 0), + OP(S_POPBACK, 0), + OP(FTOS, 0), + OP(S_MOD, 0), + OP(S_PLUSA2, 0), + OP(OBJSWAP, 0), + OP(S_ERASE, 0), + OP(SR_REF2, 0), + OP(S_ERASE2, 0), + OP(S_PUSHBACK2, 0), + OP(S_POPBACK2, 0), + OP(ITOLI, 0), + OP(LI_ADD, 0), + OP(LI_SUB, 0), + OP(LI_MUL, 0), + OP(LI_DIV, 0), + OP(LI_MOD, 0), + OP(LI_ASSIGN, 0), + OP(LI_PLUSA, 0), + OP(LI_MINUSA, 0), + OP(LI_MULA, 0), + OP(LI_DIVA, 0), + OP(LI_MODA, 0), + OP(LI_ANDA, 0), + OP(LI_ORA, 0), + OP(LI_XORA, 0), + OP(LI_LSHIFTA, 0), + OP(LI_RSHIFTA, 0), + OP(LI_INC, 0), + OP(LI_DEC, 0), + OP(A_FIND, 0), + OP(A_REVERSE, 0), + OP(SH_SR_ASSIGN, 0), + OP(SH_MEM_ASSIGN_LOCAL, 0), + OP(A_NUMOF_GLOB_1, 0), + OP(A_NUMOF_STRUCT_1, 0), + OP(SH_MEM_ASSIGN_IMM, 0), + OP(SH_LOCALREFREF, 0), + OP(SH_LOCALASSIGN_SUB_IMM, 0), + OP(SH_IF_LOC_LT_IMM, 0), + OP(SH_IF_LOC_GE_IMM, 0), + OP(SH_LOCREF_ASSIGN_MEM, 0), + OP(PAGE_REF, 0), + OP(SH_GLOBAL_ASSIGN_LOCAL, 0), + OP(SH_STRUCTREF_GT_IMM, 0), + OP(SH_STRUCT_ASSIGN_LOCALREF_ITOB, 0), + OP(SH_LOCAL_ASSIGN_STRUCTREF, 0), + OP(SH_IF_STRUCTREF_NE_LOCALREF, 0), + OP(SH_IF_STRUCTREF_GT_IMM, 0), + OP(SH_STRUCTREF_CALLMETHOD_NO_PARAM, 0), + OP(SH_STRUCTREF2, 0), + OP(SH_REF_STRUCTREF2, 0), + OP(SH_STRUCTREF3, 0), + OP(SH_STRUCTREF2_CALLMETHOD_NO_PARAM, 0), + OP(SH_IF_STRUCTREF_Z, 0), + OP(SH_IF_STRUCT_A_NOT_EMPTY, 0), + OP(SH_IF_LOC_GT_IMM, 0), + OP(SH_IF_STRUCTREF_NE_IMM, 0), + OP(THISCALLMETHOD_NOPARAM, 0), + OP(SH_IF_LOC_NE_IMM, 0), + OP(SH_IF_STRUCTREF_EQ_IMM, 0), + OP(SH_GLOBAL_ASSIGN_IMM, 0), + OP(SH_LOCALSTRUCT_ASSIGN_IMM, 0), + OP(SH_STRUCT_A_PUSHBACK_LOCAL_STRUCT, 0), + OP(SH_GLOBAL_A_PUSHBACK_LOCAL_STRUCT, 0), + OP(SH_LOCAL_A_PUSHBACK_LOCAL_STRUCT, 0), + OP(SH_IF_SREF_NE_STR0, 0), + OP(SH_S_ASSIGN_REF, 0), + OP(SH_A_FIND_SREF, 0), + OP(SH_SREF_EMPTY, 0), + OP(SH_STRUCTSREF_EQ_LOCALSREF, 0), + OP(SH_LOCALSREF_EQ_STR0, 0), + OP(SH_STRUCTSREF_NE_LOCALSREF, 0), + OP(SH_LOCALSREF_NE_STR0, 0), + OP(SH_STRUCT_SR_REF, 0), + OP(SH_STRUCT_S_REF, 0), + OP(S_REF2, 0), + OP(SH_REF_LOCAL_ASSIGN_STRUCTREF2, 0), + OP(SH_GLOBAL_S_REF, 0), + OP(SH_LOCAL_S_REF, 0), + OP(SH_LOCALREF_SASSIGN_LOCALSREF, 0), + OP(SH_LOCAL_APUSHBACK_LOCALSREF, 0), + OP(SH_S_ASSIGN_CALLSYS19, 0), + OP(SH_S_ASSIGN_STR0, 0), + OP(SH_SASSIGN_LOCALSREF, 0), + OP(SH_STRUCTREF_SASSIGN_LOCALSREF, 0), + OP(SH_LOCALSREF_EMPTY, 0), + OP(SH_GLOBAL_APUSHBACK_LOCALSREF, 0), + OP(SH_STRUCT_APUSHBACK_LOCALSREF, 0), + OP(SH_STRUCTSREF_EMPTY, 0), + OP(SH_GLOBALSREF_EMPTY, 0), + OP(SH_SASSIGN_STRUCTSREF, 0), + OP(SH_SASSIGN_GLOBALSREF, 0), + OP(SH_STRUCTSREF_NE_STR0, 0), + OP(SH_GLOBALSREF_NE_STR0, 0), + OP(SH_LOC_LT_IMM_OR_LOC_GE_IMM, 0), + OP(A_SORT_MEM, 0), + OP(DG_ADD, 0), + OP(DG_SET, 0), + OP(DG_CALL, 0), + OP(DG_NUMOF, 0), + OP(DG_EXIST, 0), + OP(DG_ERASE, 0), + OP(DG_CLEAR, 0), + OP(DG_COPY, 0), + OP(DG_ASSIGN, 0), + OP(DG_PLUSA, 0), + OP(DG_POP, 0), + OP(DG_NEW_FROM_METHOD, 0), + OP(DG_MINUSA, 0), + OP(DG_CALLBEGIN, 0), + OP(DG_NEW, 0), + OP(DG_STR_TO_METHOD, 0), +}; diff --git a/instructions.h b/instructions.h new file mode 100644 index 0000000..2f2db92 --- /dev/null +++ b/instructions.h @@ -0,0 +1,304 @@ +/* Copyright (C) 2019 Nunuhara Cabbage + * + * Credit to SLC for reverse engineering the opcodes. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see . + */ + +#ifndef SYSTEM4_INSTRUCTIONS_H +#define SYSTEM4_INSTRUCTIONS_H + +#include +#include "system4.h" + +enum opcode +{ + PUSH = 0x00, + POP = 0x01, + REF = 0x02, + REFREF = 0x03, + PUSHGLOBALPAGE = 0x04, + PUSHLOCALPAGE = 0x05, + INV = 0x06, + NOT = 0x07, + COMPL = 0x08, + ADD = 0x09, + SUB = 0x0a, + MUL = 0x0b, + DIV = 0x0c, + MOD = 0x0d, + AND = 0x0e, + OR = 0x0f, + XOR = 0x10, + LSHIFT = 0x11, + RSHIFT = 0x12, + LT = 0x13, + GT = 0x14, + LTE = 0x15, + GTE = 0x16, + NOTE = 0x17, + EQUALE = 0x18, + ASSIGN = 0x19, + PLUSA = 0x1a, + MINUSA = 0x1b, + MULA = 0x1c, + DIVA = 0x1d, + MODA = 0x1e, + ANDA = 0x1f, + ORA = 0x20, + XORA = 0x21, + LSHIFTA = 0x22, + RSHIFTA = 0x23, + F_ASSIGN = 0x24, + F_PLUSA = 0x25, + F_MINUSA = 0x26, + F_MULA = 0x27, + F_DIVA = 0x28, + DUP2 = 0x29, + DUP_X2 = 0x2a, + CMP = 0x2b, + JUMP = 0x2c, + IFZ = 0x2d, + IFNZ = 0x2e, + RETURN = 0x2f, + CALLFUNC = 0x30, + INC = 0x31, + DEC = 0x32, + FTOI = 0x33, + ITOF = 0x34, + F_INV = 0x35, + F_ADD = 0x36, + F_SUB = 0x37, + F_MUL = 0x38, + F_DIV = 0x39, + F_LT = 0x3a, + F_GT = 0x3b, + F_LTE = 0x3c, + F_GTE = 0x3D, + F_NOTE = 0x3E, + F_EQUALE = 0x3f, + F_PUSH = 0x40, + S_PUSH = 0x41, + S_POP = 0x42, + S_ADD = 0x43, + S_ASSIGN = 0x44, + S_PLUSA = 0x45, + S_REF = 0x46, + S_REFREF = 0x47, + S_NOTE = 0x48, + S_EQUALE = 0x49, + SF_CREATE = 0x4A, + SF_CREATEPIXEL = 0x4B, + SF_CREATEALPHA = 0x4C, + SR_POP = 0x4d, + SR_ASSIGN = 0x4e, + SR_REF = 0x4f, + SR_REFREF = 0x50, + A_ALLOC = 0x51, + A_REALLOC = 0x52, + A_FREE = 0x53, + A_NUMOF = 0x54, + A_COPY = 0x55, + A_FILL = 0x56, + C_REF = 0x57, + C_ASSIGN = 0x58, + MSG = 0x59, + CALLHLL = 0x5a, + PUSHSTRUCTPAGE = 0x5b, + CALLMETHOD = 0x5c, + SH_GLOBALREF = 0x5d, + SH_LOCALREF = 0x5e, + SWITCH = 0x5f, + STRSWITCH = 0x60, + FUNC = 0x61, + _EOF = 0x62, + CALLSYS = 0x63, + SJUMP = 0x64, + CALLONJUMP = 0x65, + SWAP = 0x66, + SH_STRUCTREF = 0x67, + S_LENGTH = 0x68, + S_LENGTHBYTE = 0x69, + I_STRING = 0x6a, + CALLFUNC2 = 0x6b, + DUP2_X1 = 0x6c, + R_ASSIGN = 0x6d, + FT_ASSIGNS = 0x6e, + ASSERT = 0x6f, + S_LT = 0x70, + S_GT = 0x71, + S_LTE = 0x72, + S_GTE = 0x73, + S_LENGTH2 = 0x74, + S_LENGTHBYTE2 = 0x75, + NEW = 0x76, + DELETE = 0x77, + CHECKUDO = 0x78, + A_REF = 0x79, + DUP = 0x7a, + DUP_U2 = 0x7b, + SP_INC = 0x7c, + SP_DEC = 0x7d, + ENDFUNC = 0x7e, + R_EQUALE = 0x7f, + R_NOTE = 0x80, + SH_LOCALCREATE = 0x81, + SH_LOCALDELETE = 0x82, + STOI = 0x83, + A_PUSHBACK = 0x84, + A_POPBACK = 0x85, + S_EMPTY = 0x86, + A_EMPTY = 0x87, + A_ERASE = 0x88, + A_INSERT = 0x89, + SH_LOCALINC = 0x8a, + SH_LOCALDEC = 0x8b, + SH_LOCALASSIGN = 0x8c, + ITOB = 0x8d, + S_FIND = 0x8e, + S_GETPART = 0x8f, + A_SORT = 0x90, + S_PUSHBACK = 0x91, + S_POPBACK = 0x92, + FTOS = 0x93, + S_MOD = 0x94, + S_PLUSA2 = 0x95, + OBJSWAP = 0x96, + S_ERASE = 0x97, + SR_REF2 = 0x98, + S_ERASE2 = 0x99, + S_PUSHBACK2 = 0x9A, + S_POPBACK2 = 0x9B, + ITOLI = 0x9c, + LI_ADD = 0x9d, + LI_SUB = 0x9e, + LI_MUL = 0x9f, + LI_DIV = 0xa0, + LI_MOD = 0xa1, + LI_ASSIGN = 0xa2, + LI_PLUSA = 0xa3, + LI_MINUSA = 0xa4, + LI_MULA = 0xa5, + LI_DIVA = 0xa6, + LI_MODA = 0xa7, + LI_ANDA = 0xa8, + LI_ORA = 0xa9, + LI_XORA = 0xaa, + LI_LSHIFTA = 0xab, + LI_RSHIFTA = 0xac, + LI_INC = 0xad, + LI_DEC = 0xae, + A_FIND = 0xaf, + A_REVERSE = 0xb0, + SH_SR_ASSIGN, + SH_MEM_ASSIGN_LOCAL, + A_NUMOF_GLOB_1, + A_NUMOF_STRUCT_1, + SH_MEM_ASSIGN_IMM, + SH_LOCALREFREF, + SH_LOCALASSIGN_SUB_IMM, + SH_IF_LOC_LT_IMM, + SH_IF_LOC_GE_IMM, + SH_LOCREF_ASSIGN_MEM, + PAGE_REF, + SH_GLOBAL_ASSIGN_LOCAL, + SH_STRUCTREF_GT_IMM, + SH_STRUCT_ASSIGN_LOCALREF_ITOB, + SH_LOCAL_ASSIGN_STRUCTREF, + SH_IF_STRUCTREF_NE_LOCALREF, + SH_IF_STRUCTREF_GT_IMM, + SH_STRUCTREF_CALLMETHOD_NO_PARAM, + SH_STRUCTREF2, + SH_REF_STRUCTREF2, + SH_STRUCTREF3, + SH_STRUCTREF2_CALLMETHOD_NO_PARAM, + SH_IF_STRUCTREF_Z, + SH_IF_STRUCT_A_NOT_EMPTY, + SH_IF_LOC_GT_IMM, + SH_IF_STRUCTREF_NE_IMM, + THISCALLMETHOD_NOPARAM, + SH_IF_LOC_NE_IMM, + SH_IF_STRUCTREF_EQ_IMM, + SH_GLOBAL_ASSIGN_IMM, + SH_LOCALSTRUCT_ASSIGN_IMM, + SH_STRUCT_A_PUSHBACK_LOCAL_STRUCT, + SH_GLOBAL_A_PUSHBACK_LOCAL_STRUCT, + SH_LOCAL_A_PUSHBACK_LOCAL_STRUCT, + SH_IF_SREF_NE_STR0, + SH_S_ASSIGN_REF, + SH_A_FIND_SREF, + SH_SREF_EMPTY, + SH_STRUCTSREF_EQ_LOCALSREF, + SH_LOCALSREF_EQ_STR0, + SH_STRUCTSREF_NE_LOCALSREF, + SH_LOCALSREF_NE_STR0, + SH_STRUCT_SR_REF, + SH_STRUCT_S_REF, + S_REF2, + SH_REF_LOCAL_ASSIGN_STRUCTREF2, + SH_GLOBAL_S_REF, + SH_LOCAL_S_REF, + SH_LOCALREF_SASSIGN_LOCALSREF, + SH_LOCAL_APUSHBACK_LOCALSREF, + SH_S_ASSIGN_CALLSYS19, + SH_S_ASSIGN_STR0, + SH_SASSIGN_LOCALSREF, + SH_STRUCTREF_SASSIGN_LOCALSREF, + SH_LOCALSREF_EMPTY, + SH_GLOBAL_APUSHBACK_LOCALSREF, + SH_STRUCT_APUSHBACK_LOCALSREF, + SH_STRUCTSREF_EMPTY, + SH_GLOBALSREF_EMPTY, + SH_SASSIGN_STRUCTSREF, + SH_SASSIGN_GLOBALSREF, + SH_STRUCTSREF_NE_STR0, + SH_GLOBALSREF_NE_STR0, + SH_LOC_LT_IMM_OR_LOC_GE_IMM, + // instruction names are known, exact order of them are guesses after this point + A_SORT_MEM, + DG_ADD, + DG_SET, + DG_CALL, + DG_NUMOF, + DG_EXIST, + DG_ERASE, + DG_CLEAR, + DG_COPY, + DG_ASSIGN, + DG_PLUSA, + DG_POP, + DG_NEW_FROM_METHOD, + DG_MINUSA, + DG_CALLBEGIN, + DG_NEW, + DG_STR_TO_METHOD, + + NR_OPCODES +}; + +struct instruction { + const enum opcode opcode; // the opcode + const char * const name; // assembler name + const int nr_args; // number of arguments (???: always 1 or 0?) + const int ip_inc; // amount to increment instruction pointer after instruction +}; + +const struct instruction instructions[NR_OPCODES]; + +static const_pure inline int32_t instruction_width(enum opcode opcode) +{ + return 2 + instructions[opcode].nr_args * 4; +} + +#endif /* SYSTEM4_INSTRUCTIONS_H */ diff --git a/little_endian.h b/little_endian.h new file mode 100644 index 0000000..b48031f --- /dev/null +++ b/little_endian.h @@ -0,0 +1,64 @@ +/* Copyright (C) 2019 Nunuhara Cabbage + * + * Based on code from xsystem35 + * Copyright (C) 1997-1998 Masaki Chikama (Wren) + * 1998- + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see . + */ + +#ifndef LITTLE_ENDIAN_H +#define LITTLE_ENDIAN_H + +#include + +static inline int32_t LittleEndian_getDW(const uint8_t *b, int i) +{ + int c0, c1, c2, c3; + int d0, d1; + c0 = *(b + i + 0); + c1 = *(b + i + 1); + c2 = *(b + i + 2); + c3 = *(b + i + 3); + d0 = c0 + (c1 << 8); + d1 = c2 + (c3 << 8); + return d0 + (d1 << 16); +} + +static inline int32_t LittleEndian_get3B(const uint8_t *b, int i) +{ + int c0, c1, c2; + c0 = *(b + i + 0); + c1 = *(b + i + 1); + c2 = *(b + i + 2); + return c0 + (c1 << 8) + (c2 << 16); +} + +static inline int16_t LittleEndian_getW(const uint8_t *b, int i) +{ + int c0, c1; + c0 = *(b + i + 0); + c1 = *(b + i + 1); + return c0 + (c1 << 8); +} + +static inline void LittleEndian_putDW(uint8_t *dst, int i, uint32_t dword) +{ + dst[i] = (uint8_t)(dword); + dst[i+1] = (uint8_t)(dword >> 8); + dst[i+2] = (uint8_t)(dword >> 16); + dst[i+3] = (uint8_t)(dword >> 24); +} + +#endif /* LITTLE_ENDIAN_H */ diff --git a/meson.build b/meson.build new file mode 100644 index 0000000..5ad3951 --- /dev/null +++ b/meson.build @@ -0,0 +1,4 @@ +project('system4', 'c') +system4 = ['system4.c', 'ain.c', 'instructions.c', 'vm.c', 'string.c'] +zdep = dependency('zlib') +executable('system4', system4, dependencies: zdep) diff --git a/string.c b/string.c new file mode 100644 index 0000000..54c2ceb --- /dev/null +++ b/string.c @@ -0,0 +1,62 @@ +/* Copyright (C) 2019 Nunuhara Cabbage + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see . + */ + +#include +#include +#include +#include "system4.h" +#include "sys4_string.h" + +struct string make_string(char *str, size_t len) +{ + return (struct string) { + .str = str, + .len = len, + .mutable = false + }; +} + +void free_string(struct string *str) +{ + if (str->mutable) + free(str->str); +} + +void string_add(struct string *a, struct string *b) +{ + if (a->mutable) { + a->str = xrealloc(a->str, a->len + b->len + 1); + } else { + char *literal = a->str; + a->str = xmalloc(a->len + b->len + 1); + memcpy(a->str, literal, a->len + 1); + } + memcpy(a->str + a->len, b->str, b->len + 1); + a->len = a->len + b->len; +} + +struct string integer_to_string(int n) +{ + char buf[513]; + int len = snprintf(buf, 512, "%d" ,n); + buf[512] = '\0'; + + return (struct string) { + .str = xstrdup(buf), + .len = len, + .mutable = true + }; +} diff --git a/sys4_string.h b/sys4_string.h new file mode 100644 index 0000000..82f506f --- /dev/null +++ b/sys4_string.h @@ -0,0 +1,34 @@ +/* Copyright (C) 2019 Nunuhara Cabbage + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see . + */ + +#ifndef SYSTEM4_STRING_H +#define SYSTEM4_STRING_H + +#include +#include + +struct string { + char *str; + size_t len; + bool mutable; +}; + +struct string make_string(char *str, size_t len); +void free_string(struct string *str); +void string_add(struct string *a, struct string *b); +struct string integer_to_string(int n); + +#endif diff --git a/system4.c b/system4.c new file mode 100644 index 0000000..bba20c7 --- /dev/null +++ b/system4.c @@ -0,0 +1,101 @@ +/* Copyright (C) 2019 Nunuhara Cabbage + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see . + */ + +#include +#include +#include +#include + +#include "system4.h" +#include "ain.h" + +mem_alloc void *_xmalloc(size_t size, const char *func) +{ + void *ptr = malloc(size); + if (!ptr) { + sys_error("*ERROR*(%s): Out of memory\n", func); + } + return ptr; +} + +mem_alloc void *_xrealloc(void *ptr, size_t size, const char *func) +{ + ptr = realloc(ptr, size); + if (!ptr) { + sys_error("*ERROR*(%s): Out of memory\n", func); + } + return ptr; +} + +mem_alloc char *_xstrdup(const char *in, const char *func) +{ + char *out = strdup(in); + if (!out) { + sys_error("*ERROR*(%s): Out of memory\n", func); + } + return out; +} + +noreturn void sys_error(char *fmt, ...) +{ + va_list ap; + va_start(ap, fmt); + vfprintf(stderr, fmt, ap); + va_end(ap); + sys_exit(1); +} + +void sys_warning(char *fmt, ...) +{ + va_list ap; + + va_start(ap, fmt); + vfprintf(stderr, fmt, ap); + va_end(ap); +} + +void sys_message(char *fmt, ...) +{ + va_list ap; + va_start(ap, fmt); + vprintf(fmt, ap); + va_end(ap); + fflush(stdout); +} + +noreturn void sys_exit(int code) +{ + // TODO: cleanup + exit(code); +} + +int main(int argc, char *argv[]) +{ + int err = AIN_SUCCESS; + struct ain *ain; + + if (argc != 2) { + printf("wrong number of arguments\n"); + return 1; + } + + if (!(ain = ain_open(argv[1], &err))) { + ERROR("%s", ain_strerror(err)); + } + + vm_execute(ain); + sys_exit(0); +} diff --git a/system4.h b/system4.h new file mode 100644 index 0000000..6446adc --- /dev/null +++ b/system4.h @@ -0,0 +1,65 @@ +/* Copyright (C) 2019 Nunuhara Cabbage + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see . + */ + +#ifndef SYSTEM4_H +#define SYSTEM4_H + +#include + +// TODO: should put in a separate header and guard with feature checks +#define const_pure __attribute__((const)) +#define mem_alloc __attribute__((malloc)) +#define noreturn _Noreturn + +#define ERROR(fmt, ...) \ + sys_error("*ERROR*(%s): " fmt "\n", __func__, ##__VA_ARGS__) + +#define WARNING(fmt, ...) \ + sys_error("*ERROR*(%s): " fmt "\n", __func__, ##__VA_ARGS__) + +#define NOTICE(fmt, ...) \ + sys_message(fmt "\n", ##__VA_ARGS__) + +noreturn void sys_error(char *fmt, ...); +void sys_warning(char *fmt, ...); +void sys_message(char *fmt, ...); + +noreturn void sys_exit(int code); + +#define xmalloc(size) _xmalloc(size, __func__) +mem_alloc void *_xmalloc(size_t size, const char *func); + +#define xrealloc(ptr, size) _xrealloc(ptr, size, __func__) +mem_alloc void *_xrealloc(void *ptr, size_t size, const char *func); + +#define xstrdup(str) _xstrdup(str, __func__) +mem_alloc char *_xstrdup(const char *in, const char *func); + +#define max(a, b) \ + ({ \ + __typeof__ (a) _a = (a); \ + __typeof__ (b) _b = (b); \ + _a > _b ? _a : _b; \ + }) + +#define min(a, b) \ + ({ \ + __typeof__ (a) _a = (a); \ + __typeof__ (b) _b = (b); \ + _a < _b ? _a : _b; \ + }) + +#endif /* SYSTEM4_H */ diff --git a/vm.c b/vm.c new file mode 100644 index 0000000..e548323 --- /dev/null +++ b/vm.c @@ -0,0 +1,329 @@ +/* Copyright (C) 2019 Nunuhara Cabbage + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see . + */ + +#include +#include + +#include "system4.h" +#include "sys4_string.h" +#include "ain.h" +#include "instructions.h" +#include "little_endian.h" + +/* + * NOTE: The current implementation is a simple bytecode interpreter. + * System40.exe uses a JIT compiler, and we should too. + */ + +static int32_t *stack = NULL; +static size_t stack_size; +static int stack_ptr = 0; + +// Separate stack for strings +// Not sure exactly how System40.exe handles strings. +// Further testing required to ensure this approach doesn't break anything. +static struct string string_stack[1024]; +static int string_stack_ptr = 0; + +//static struct frame *frame_stack[1024]; +static int32_t frame_stack[4096]; +static int frame_ptr = 0; + +#define FRAME_FN_OFF 0 // offset to function number +#define FRAME_IP_OFF 1 // offset to return address +#define FRAME_FP_OFF 2 // offset to frame pointer +#define FRAME_VAR_OFF 3 // offset to variables + +static struct ain *ain; +static size_t instr_ptr = 0; + +static int32_t local_ref(int varno) +{ + return frame_stack[frame_ptr + FRAME_VAR_OFF + varno]; +} + +static void local_set(int varno, int32_t value) +{ + frame_stack[frame_ptr + FRAME_VAR_OFF + varno] = value; +} + +// Read the opcode at ADDR. +static int16_t get_opcode(size_t addr) +{ + return LittleEndian_getW(ain->code, addr); +} + +// Read argument N for the current instruction. +static int32_t get_argument(int n) +{ + return LittleEndian_getDW(ain->code, instr_ptr + 2 + n*4); +} + +static void stack_push(int32_t v) +{ + stack[stack_ptr++] = v; +} + +static int32_t stack_pop(void) +{ + stack_ptr--; + return stack[stack_ptr]; +} + +// Pop a reference off the stack, returning the address of the referenced object. +static int32_t stack_pop_ref(void) +{ + int32_t index = stack_pop(); + int32_t frame = stack_pop(); + return frame + FRAME_VAR_OFF + index; +} + +static void stack_push_string_literal(int32_t no) +{ + // FIXME: should store string length when reading AIN + string_stack[string_stack_ptr++] = make_string(ain->strings[no], strlen(ain->strings[no])); +} + +static void stack_push_string(struct string *str) +{ + string_stack[string_stack_ptr++] = *str; +} + +static struct string stack_pop_string(void) +{ + string_stack_ptr--; + return string_stack[string_stack_ptr]; +} + +static void stack_toss_string(void) +{ + string_stack_ptr--; + free_string(&string_stack[string_stack_ptr]); +} + +static struct string *stack_peek_string(void) +{ + return &string_stack[string_stack_ptr-1]; +} + +/* + * System 4 calling convention: + * - caller pushes arguments, in order + * - CALLFUNC creates stack frame ("page", on separate stack), pops arguments + * - callee pushes return value on the stack + * - RETURN jumps to return address (saved in stack frame) + */ + +static void function_call(int32_t no) +{ + int32_t cur_fno = frame_stack[frame_ptr + FRAME_FN_OFF]; + int32_t new_fp = frame_ptr + FRAME_VAR_OFF + ain->functions[cur_fno].nr_vars; + + // create new stack frame + frame_stack[new_fp + FRAME_FN_OFF] = no; + frame_stack[new_fp + FRAME_IP_OFF] = instr_ptr + instruction_width(CALLFUNC); + frame_stack[new_fp + FRAME_FP_OFF] = frame_ptr; + for (int i = ain->functions[no].nr_args - 1; i >= 0; i--) { + frame_stack[new_fp + FRAME_VAR_OFF + i] = stack_pop(); + } + + // update frame & instruction pointers + frame_ptr = new_fp; + instr_ptr = ain->functions[no].address; +} + +static void function_return(void) +{ + instr_ptr = frame_stack[frame_ptr + FRAME_IP_OFF]; + frame_ptr = frame_stack[frame_ptr + FRAME_FP_OFF]; +} + +static void system_call(int32_t code) +{ + switch (code) { + case 0x6: // system.Output(string szText) + sys_message("%s", stack_peek_string()->str); + // XXX: caller S_POPs + break; + case 0x14: // system.Peek() + break; + case 0x15: // system.Sleep(int nSleep) + stack_pop(); + break; + default: + WARNING("Unimplemented syscall: 0x%X", code); + } +} + +static void execute_instruction(int16_t opcode) +{ + int32_t index, a, b; + struct string sa, sb; + const char *opcode_name = "UNKNOWN"; + switch (opcode) { + // + // --- Stack Management --- + // + case PUSH: + stack_push(get_argument(0)); + break; + case POP: + stack_pop(); + break; + case REF: + // Dereference a reference to a value. + stack_push(frame_stack[stack_pop_ref()]); + break; + case REFREF: + // Dereference a reference to a reference. + index = stack_pop_ref(); + stack_push(frame_stack[index]); + stack_push(frame_stack[index + 1]); + break; + case PUSHLOCALPAGE: + stack_push(frame_ptr); + break; + case SH_LOCALREF: // VARNO + // Push the value of VARNO to the stack + stack_push(local_ref(get_argument(0))); + break; + case SH_LOCALASSIGN: // VARNO, VALUE + // Assign VALUE to local VARNO + local_set(get_argument(0), get_argument(1)); + break; + case SH_LOCALINC: // VARNO + index = get_argument(0); + local_set(index, local_ref(index)+1); + break; + case SH_LOCALDEC: // VARNO + index = get_argument(0); + local_set(index, local_ref(index)-1); + break; + // + // --- Function Calls --- + // + case CALLFUNC: + function_call(get_argument(0)); + break; + case RETURN: + function_return(); + break; + case CALLSYS: + system_call(get_argument(0)); + break; + // + // --- Control Flow --- + // + case JUMP: // ADDR + instr_ptr = get_argument(0); + break; + case IFZ: // ADDR + if (!stack_pop()) + instr_ptr = get_argument(0); + else + instr_ptr += instruction_width(IFZ); + break; + case IFNZ: // ADDR + if (stack_pop()) + instr_ptr = get_argument(0); + else + instr_ptr += instruction_width(IFNZ); + break; + // + // --- Arithmetic --- + // + case LT: + b = stack_pop(); + a = stack_pop(); + stack_push(a < b ? 1 : 0); + break; + case GT: + b = stack_pop(); + a = stack_pop(); + stack_push(a > b ? 1 : 0); + break; + case LTE: + b = stack_pop(); + a = stack_pop(); + stack_push(a <= b ? 1 : 0); + break; + case GTE: + b = stack_pop(); + a = stack_pop(); + stack_push(a >= b ? 1 : 0); + break; + case NOTE: + b = stack_pop(); + a = stack_pop(); + stack_push(a != b ? 1 : 0); + break; + case EQUALE: + b = stack_pop(); + a = stack_pop(); + stack_push(a == b ? 1 : 0); + break; + // + // --- Strings --- + // + case S_PUSH: + stack_push_string_literal(get_argument(0)); + break; + case S_POP: + stack_toss_string(); + break; + case S_ADD: + sb = stack_pop_string(); + sa = stack_pop_string(); + string_add(&sa, &sb); + stack_push_string(&sa); + break; + case I_STRING: + sa = integer_to_string(stack_pop()); + stack_push_string(&sa); + break; + // -- NOOPs --- + case FUNC: + break; + default: + if (opcode >= 0 && opcode < NR_OPCODES && instructions[opcode].name) { + opcode_name = instructions[opcode].name; + } + WARNING("Unimplemented instruction: 0x%X(%s)", opcode, opcode_name); + } +} + +void vm_execute(struct ain *program) +{ + // initialize machine state + stack_ptr = 0; + frame_ptr = 0; + stack_size = 1024; + stack = xmalloc(stack_size); + ain = program; + + // jump to main and begin fetch-decode-execute cycle + //instr_ptr = ain->functions[ain->main].address; + function_call(ain->main); + for ( ; instr_ptr < ain->code_size; ) + { + if (instr_ptr >= ain->code_size) { + ERROR("Illegal instruction pointer: 0x%lX", instr_ptr); + } + int16_t opcode = get_opcode(instr_ptr); + execute_instruction(opcode); + instr_ptr += instructions[opcode].ip_inc; + } +}