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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <lcq/royaljelly/library.h>
#include <lcq/pit/types.h>
#include <lcq/pit/runtime.h>
#include <lcq/elf.h>
struct elf_builder {
i64 cap;
elf_ctx ctx;
};
static void builder_ensure_size(struct elf_builder *e, i64 sz) {
i64 cur = e->ctx.len;
i64 cap = e->cap;
if (sz <= cur) return;
while (cap < sz) cap <<= 1;
e->ctx.buf = realloc(e->ctx.buf, (size_t) cap);
memset(e->ctx.buf + e->cap, 0, (size_t) (cap - e->cap));
e->ctx.len = sz;
}
static pit_value impl_elf_new(pit_runtime *rt, pit_value kwargs) {
/*
i64 vclass = pit_as_integer(rt, pit_plist_get(rt, pit_intern_cstr(rt, ":class"), kwargs));
i64 vendianness = pit_as_integer(rt, pit_plist_get(rt, pit_intern_cstr(rt, ":endianness"), kwargs));
*/
i64 vclass = -1;
i64 vendianness = -1;
struct elf_builder *ret = malloc(sizeof(struct elf_builder));
i64 len = 256;
u8 *buf = calloc((size_t) len, 1);
ret->cap = len;
ret->ctx = elf_ctx_new(buf, len,
vclass > 0 ? vclass : ELF_CLASS_64,
vendianness > 0 ? vendianness : ELF_ENDIANNESS_LITTLE
);
return pit_nativedata_new(rt, pit_intern_cstr(rt, "elf"), (void *) ret);
}
static i64 get_kwargs_i64(pit_runtime *rt, i64 def, pit_value kwargs, char *kw) {
pit_value v = pit_plist_get(rt, pit_intern_cstr(rt, kw), kwargs);
if (v != PIT_NIL && pit_is_integer(rt, v)) {
return pit_as_integer(rt, v);
} else {
return def;
}
}
static pit_value impl_elf_write_header(pit_runtime *rt, pit_value args) {
pit_value velf = pit_car(rt, args);
pit_value kwargs = pit_cdr(rt, args);
elf_header h = {0};
struct elf_builder *e = pit_nativedata_get(rt, pit_intern_cstr(rt, "elf"), velf);
if (!e) return PIT_NIL;
builder_ensure_size(e, elf_header_size(&e->ctx));
h.type = get_kwargs_i64(rt, ELF_TYPE_EXEC, kwargs, ":type");
h.machine = get_kwargs_i64(rt, ELF_MACHINE_AMD64, kwargs, ":machine");
h.version = (u32) get_kwargs_i64(rt, 1, kwargs, ":version");
h.entry = (u64) get_kwargs_i64(rt, 0x401000, kwargs, ":entry");
h.program_header_offset = (u64) get_kwargs_i64(rt, 0, kwargs, ":program-header-offset");
h.program_header_entry_size = (u16) get_kwargs_i64(rt, elf_program_header_size(&e->ctx), kwargs, ":program-header-entry-size");
h.program_header_entries = (u16) get_kwargs_i64(rt, 1, kwargs, ":program-header-entries");
h.section_header_offset = (u64) get_kwargs_i64(rt, 0, kwargs, ":section-header-offset");
h.section_header_entry_size = (u16) get_kwargs_i64(rt, elf_section_header_size(&e->ctx), kwargs, ":section-header-entry-size");
h.section_header_entries = (u16) get_kwargs_i64(rt, 0, kwargs, ":section-header-entries");
h.section_name_table_index = (u16) get_kwargs_i64(rt, 1, kwargs, ":section-name-table-index");
elf_write_header(&h, &e->ctx);
return PIT_NIL;
}
static pit_value impl_elf_write_section_header(pit_runtime *rt, pit_value args) {
pit_value velf = pit_car(rt, args);
pit_value voff = pit_car(rt, pit_cdr(rt, args));
i64 off = pit_as_integer(rt, voff);
pit_value kwargs = pit_cdr(rt, pit_cdr(rt, args));
elf_section_header h = {0};
struct elf_builder *e = pit_nativedata_get(rt, pit_intern_cstr(rt, "elf"), velf);
if (!e) return PIT_NIL;
if (off < 0) { pit_error(rt, "negative offset: %d", off); return PIT_NIL; }
builder_ensure_size(e, off + elf_header_size(&e->ctx));
h.name_index = (u32) get_kwargs_i64(rt, ELF_SECTION_TYPE_NULL, kwargs, ":name-index");
h.type = (u32) get_kwargs_i64(rt, ELF_SECTION_TYPE_NULL, kwargs, ":type");
h.flags = (u64) get_kwargs_i64(rt, 0, kwargs, ":flags");
h.addr = (u64) get_kwargs_i64(rt, 0, kwargs, ":addr");
h.offset = (u64) get_kwargs_i64(rt, 0, kwargs, ":offset");
h.size = (u64) get_kwargs_i64(rt, 0, kwargs, ":size");
h.link = (u32) get_kwargs_i64(rt, 0, kwargs, ":link");
h.info = (u32) get_kwargs_i64(rt, 0, kwargs, ":info");
h.addr_alignment = (u64) get_kwargs_i64(rt, 0, kwargs, ":addr-alignment");
h.entry_size = (u64) get_kwargs_i64(rt, 0, kwargs, ":entry-size");
elf_write_section_header(&h, &e->ctx, (u64) off);
return PIT_NIL;
}
static pit_value impl_elf_spit(pit_runtime *rt, pit_value args) {
char pathbuf[1024] = {0};
i64 len = 0, actual = 0;
FILE *f = NULL;
struct elf_builder *e = NULL;
pit_value path = pit_car(rt, args);
pit_value velf = pit_car(rt, pit_cdr(rt, args));
len = pit_as_bytes(rt, path, (u8 *) pathbuf, sizeof(pathbuf) - 1);
if (len < 0) { pit_error(rt, "path was not a string"); return PIT_NIL; }
pathbuf[len] = 0;
e = pit_nativedata_get(rt, pit_intern_cstr(rt, "elf"), velf);
if (!e) return PIT_NIL;
f = fopen(pathbuf, "w+");
if (!f) {
pit_error(rt, "failed to open file: %s", pathbuf);
return PIT_NIL;
}
actual = (i64) fwrite(e->ctx.buf, 1, (size_t) e->ctx.len, f);
fclose(f);
if (e->ctx.len != actual) {
pit_error(rt, "failed to write ELF file");
return PIT_NIL;
}
return velf;
}
void rj_install_library(pit_runtime *rt) {
/* constants */
pit_set(rt, pit_intern_cstr(rt, "elf/CLASS_INVALID"), pit_integer_new(rt, 0));
pit_set(rt, pit_intern_cstr(rt, "elf/CLASS_32"), pit_integer_new(rt, 1));
pit_set(rt, pit_intern_cstr(rt, "elf/CLASS_64"), pit_integer_new(rt, 2));
pit_set(rt, pit_intern_cstr(rt, "elf/ENDIANNESS_INVALID"), pit_integer_new(rt, 0));
pit_set(rt, pit_intern_cstr(rt, "elf/ENDIANNESS_LITTLE"), pit_integer_new(rt, 1));
pit_set(rt, pit_intern_cstr(rt, "elf/ENDIANNESS_BIG"), pit_integer_new(rt, 2));
pit_set(rt, pit_intern_cstr(rt, "elf/TYPE_NONE"), pit_integer_new(rt, 0));
pit_set(rt, pit_intern_cstr(rt, "elf/TYPE_REL"), pit_integer_new(rt, 1));
pit_set(rt, pit_intern_cstr(rt, "elf/TYPE_EXEC"), pit_integer_new(rt, 2));
pit_set(rt, pit_intern_cstr(rt, "elf/TYPE_DYN"), pit_integer_new(rt, 3));
pit_set(rt, pit_intern_cstr(rt, "elf/TYPE_CORE"), pit_integer_new(rt, 4));
pit_set(rt, pit_intern_cstr(rt, "elf/MACHINE_NONE"), pit_integer_new(rt, 0));
pit_set(rt, pit_intern_cstr(rt, "elf/MACHINE_X86"), pit_integer_new(rt, 3));
pit_set(rt, pit_intern_cstr(rt, "elf/MACHINE_AMD64"), pit_integer_new(rt, 62));
pit_fset(rt, pit_intern_cstr(rt, "elf/new!"), pit_nativefunc_new(rt, impl_elf_new));
pit_fset(rt, pit_intern_cstr(rt, "elf/write-header!"), pit_nativefunc_new(rt, impl_elf_write_header));
pit_fset(rt, pit_intern_cstr(rt, "elf/write-section-header!"), pit_nativefunc_new(rt, impl_elf_write_section_header));
pit_fset(rt, pit_intern_cstr(rt, "elf/spit!"), pit_nativefunc_new(rt, impl_elf_spit));
}
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