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Parse EFI command line arguments (#12)

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This commit is contained in:
Justine Tunney 2021-02-21 23:33:44 -08:00
parent 537c21338b
commit ac3b1dfb21
3 changed files with 81 additions and 14 deletions
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38
libc/runtime/efimain.c → libc/runtime/efimain.greg.c
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@ -18,10 +18,19 @@
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/efi.h"
#include "libc/dce.h"
#include "libc/macros.h"
#include "libc/nt/efi.h"
#include "libc/nt/thunk/msabi.h"
#include "libc/runtime/internal.h"
#include "libc/runtime/runtime.h"
struct EfiArgs {
char *args[4096];
char argblock[ARG_MAX];
};
static const EFI_GUID kEfiLoadedImageProtocol = LOADED_IMAGE_PROTOCOL;
/**
* EFI Application Entrypoint.
*
@ -39,7 +48,7 @@
*
* qemu-system-x86_64 \
* -bios OVMF.fd \
* -serial stdio \
* -nographic \
* -net none \
* -drive format=raw,file=fat:rw:o/tool/viz
* FS0:
@ -56,17 +65,30 @@
*/
__msabi noasan EFI_STATUS EfiMain(EFI_HANDLE ImageHandle,
EFI_SYSTEM_TABLE *SystemTable) {
intptr_t argc;
struct EfiArgs *ea;
EFI_LOADED_IMAGE *img;
extern char os asm("__hostos");
os = UEFI;
__efi_image_handle = ImageHandle;
__efi_system_table = SystemTable;
asm("push\t$0\n\t"
"push\t$0\n\t"
"push\t$0\n\t"
"push\t$0\n\t"
"push\t$0\n\t"
"xor\t%edi,%edi\n\t"
SystemTable->BootServices->AllocatePool(EfiConventionalMemory, sizeof(*ea),
&ea);
SystemTable->BootServices->HandleProtocol(ImageHandle,
&kEfiLoadedImageProtocol, &img);
argc = GetDosArgv(img->LoadOptions, ea->argblock, ARG_MAX, ea->args,
ARRAYLEN(ea->args));
asm("push\t$0\n\t" /* auxv[0][1] */
"push\t$0\n\t" /* auxv[0][0] */
"push\t$0\n\t" /* envp[0] */
"sub\t%2,%%rsp\n\t"
"mov\t%%rsp,%%rdi\n\t"
"rep movsb\n\t" /* argv */
"push\t%0\n\t" /* argc */
"xor\t%%edi,%%edi\n\t"
".weak\t_start\n\t"
"jmp\t_start");
"jmp\t_start"
: /* no outputs */
: "a"(argc), "S"(ea->args), "c"((argc + 1) * 8));
unreachable;
}