mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-06-27 06:48:31 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

Make terminal ui binaries work well everywhere

Browse source 
Here's some screenshots of an emulator tui program that was compiled on
Linux, then scp'd it to Windows, Mac, and FreeBSD.

https://justine.storage.googleapis.com/blinkenlights-cmdexe.png
https://justine.storage.googleapis.com/blinkenlights-imac.png
https://justine.storage.googleapis.com/blinkenlights-freebsd.png
https://justine.storage.googleapis.com/blinkenlights-lisp.png

How is this even possible that we have a nontrivial ui binary that just
works on Mac, Windows, Linux, and BSD? Surely a first ever achievement.

Fixed many bugs. Bootstrapped John McCarthy's metacircular evaluator on
bare metal in half the size of Altair BASIC (about 2.5kb) and ran it in
emulator for fun and profit.
This commit is contained in:
Justine Tunney 2020-10-10 21:18:53 -07:00
parent 680daf1210
commit 9e3e985ae5
276 changed files with 7026 additions and 3790 deletions
Download patch file Download diff file Expand all files Collapse all files

48
tool/build/lib/loader.c
View file

@ -23,20 +23,21 @@
#include "libc/elf/elf.h"
#include "libc/elf/struct/phdr.h"
#include "libc/log/check.h"
#include "libc/log/log.h"
#include "libc/macros.h"
#include "libc/nexgen32e/vendor.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/stdio.h"
#include "libc/sysv/consts/fileno.h"
#include "libc/sysv/consts/map.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/consts/prot.h"
#include "tool/build/lib/argv.h"
#include "tool/build/lib/endian.h"
#include "tool/build/lib/loader.h"
#include "tool/build/lib/machine.h"
#include "tool/build/lib/memory.h"
#define DSOLOL "ERROR: ELF not ET_EXEC try `gcc -static -o foo foo.c`\n"
static void LoadElfLoadSegment(struct Machine *m, void *code, size_t codesize,
Elf64_Phdr *phdr) {
void *rbss;
@ -45,13 +46,20 @@ static void LoadElfLoadSegment(struct Machine *m, void *code, size_t codesize,
align = MAX(phdr->p_align, PAGESIZE);
CHECK_EQ(1, popcnt(align));
CHECK_EQ(0, (phdr->p_vaddr - phdr->p_offset) % align);
/*-Type-Offset---VirtAddr-----------PhysAddr-----------FileSiz--MemSiz---Flg-Align----*/
/*-LOAD-0x000000-0x0000000000400000-0x0000000000400000-0x0008e4-0x0008e4-R-E-0x200000-*/
/*-LOAD-0x000fe0-0x0000000000600fe0-0x0000000000600fe0-0x000030-0x000310-RW--0x200000-*/
felf = (int64_t)(intptr_t)code;
vstart = ROUNDDOWN(phdr->p_vaddr, align);
vbss = ROUNDUP(phdr->p_vaddr + phdr->p_filesz, align);
vend = ROUNDUP(phdr->p_vaddr + phdr->p_memsz, align);
fstart = felf + ROUNDDOWN(phdr->p_offset, align);
fend = felf + ROUNDUP(phdr->p_offset + phdr->p_filesz, align);
fend = felf + phdr->p_offset + phdr->p_filesz;
bsssize = vend - vbss;
LOGF("LOADELFLOADSEGMENT"
" VSTART %#lx VBSS %#lx VEND %#lx"
" FSTART %#lx FEND %#lx BSSSIZE %#lx",
vstart, vbss, vend, fstart, fend, bsssize);
m->brk = MAX(m->brk, vend);
CHECK_GE(vend, vstart);
CHECK_GE(fend, fstart);
@ -61,12 +69,9 @@ static void LoadElfLoadSegment(struct Machine *m, void *code, size_t codesize,
CHECK_GE(vend - vstart, fstart - fend);
CHECK_LE(phdr->p_filesz, phdr->p_memsz);
CHECK_EQ(felf + phdr->p_offset - fstart, phdr->p_vaddr - vstart);
CHECK_NE(-1, RegisterMemory(m, vstart, (void *)fstart, fend - fstart));
if (bsssize) {
CHECK_NE(MAP_FAILED, (rbss = mmap(NULL, bsssize, PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0)));
CHECK_NE(-1, RegisterMemory(m, vbss, rbss, bsssize));
}
CHECK_NE(-1, ReserveVirtual(m, vstart, fend - fstart));
VirtualRecv(m, vstart, (void *)fstart, fend - fstart);
if (bsssize) CHECK_NE(-1, ReserveVirtual(m, vbss, bsssize));
if (phdr->p_memsz - phdr->p_filesz > bsssize) {
VirtualSet(m, phdr->p_vaddr + phdr->p_filesz, 0,
phdr->p_memsz - phdr->p_filesz - bsssize);
@ -76,11 +81,8 @@ static void LoadElfLoadSegment(struct Machine *m, void *code, size_t codesize,
static void LoadElf(struct Machine *m, struct Elf *elf) {
unsigned i;
Elf64_Phdr *phdr;
if (elf->ehdr->e_type != ET_EXEC) {
write(STDERR_FILENO, DSOLOL, strlen(DSOLOL));
exit(1);
}
m->ip = elf->base = elf->ehdr->e_entry;
LOGF("LOADELF ENTRY %p", m->ip);
for (i = 0; i < elf->ehdr->e_phnum; ++i) {
phdr = getelfsegmentheaderaddress(elf->ehdr, elf->size, i);
switch (phdr->p_type) {
@ -114,10 +116,11 @@ void LoadProgram(struct Machine *m, const char *prog, char **args, char **vars,
struct Elf *elf) {
int fd;
ssize_t rc;
int64_t sp;
char *real;
void *stack;
struct stat st;
char *real, *memory;
size_t i, codesize, mappedsize, extrasize, stacksize;
size_t i, codesize, mappedsize, extrasize;
DCHECK_NOTNULL(prog);
elf->prog = prog;
if ((fd = open(prog, O_RDONLY)) == -1 ||
@ -148,14 +151,11 @@ void LoadProgram(struct Machine *m, const char *prog, char **args, char **vars,
ResetCpu(m);
if (m->mode == XED_MACHINE_MODE_REAL) {
elf->base = 0x7c00;
CHECK_NE(MAP_FAILED,
(memory = mmap(NULL, BIGPAGESIZE, PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0)));
RegisterMemory(m, 0, memory, BIGPAGESIZE);
CHECK_NE(-1, ReserveVirtual(m, 0, BIGPAGESIZE));
m->ip = 0x7c00;
Write64(m->cs, 0);
Write64(m->dx, 0);
memcpy(memory + 0x7c00, elf->map, 512);
VirtualRecv(m, m->ip, elf->map, 512);
if (memcmp(elf->map, "\177ELF", 4) == 0) {
elf->ehdr = (void *)elf->map;
elf->size = codesize;
@ -166,11 +166,9 @@ void LoadProgram(struct Machine *m, const char *prog, char **args, char **vars,
elf->size = 0;
}
} else {
stacksize = STACKSIZE;
CHECK_NE(MAP_FAILED, (stack = mmap(NULL, stacksize, PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0)));
Write64(m->sp, 0x0000800000000000);
RegisterMemory(m, 0x0000800000000000 - stacksize, stack, stacksize);
sp = 0x800000000000;
Write64(m->sp, sp);
CHECK_NE(-1, ReserveVirtual(m, sp - STACKSIZE, STACKSIZE));
LoadArgv(m, prog, args, vars);
if (memcmp(elf->map, "\177ELF", 4) == 0) {
elf->ehdr = (void *)elf->map;