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Support malloc() on bare metal

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Your Actually Portable Executables now contains a simple virtual memory
that works similarly to the Linux Kernel in the sense that it maps your
physical memory to negative addresses. This is needed to support mmap()
and malloc(). This functionality has zero code size impact. For example
the MODE=tiny LIFE.COM executable is still only 12KB in size.

The APE bootloader code has also been simplified to improve readibility
and further elevate the elegance by which we're able to support so many
platforms thereby enhancing verifiability so that we may engender trust
in this bootloading process.
This commit is contained in:
Justine Tunney
2021-02-23 20:23:19 -08:00
parent ac3b1dfb21
commit edd9297eba
89 changed files with 900 additions and 1417 deletions
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41
ape/ape.lds
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@ -175,7 +175,7 @@
#ifdef __LINKER__
#include "ape/macros.internal.h"
#include "ape/config.h"
#include "ape/relocations.h"
#include "libc/dce.h"
#include "libc/nt/pedef.internal.h"
#include "libc/zip.h"
@ -196,11 +196,12 @@ SECTIONS {
/*BEGIN: linux addressability guarantee */
/*BEGIN: bsd addressability guarantee */
.head SEGMENT_START("text-segment", IMAGE_BASE_VIRTUAL) : {
.head SEGMENT_START("text-segment", IMAGE_BASE_VIRTUAL) : AT(IMAGE_BASE_REAL) {
HIDDEN(_base = .);
/* Real Mode */
KEEP(*(.head))
KEEP(*(.text.head))
/* Executable & Linkable Format */
. = ALIGN(__SIZEOF_POINTER__);
@ -220,16 +221,14 @@ SECTIONS {
HIDDEN(ape_pe_sections = .);
KEEP(*(.pe.sections))
HIDDEN(ape_pe_sections_end = .);
. += 1;
/* Mach-O */
KEEP(*(.macho))
. = ALIGN(__SIZEOF_POINTER__);
HIDDEN(ape_macho_end = .);
. += 1;
KEEP(*(.ape.pad.head))
. = ALIGN(SupportsWindows() || SupportsUefi() ? PAGESIZE : 16);
. = ALIGN(SupportsWindows() || SupportsMetal() ? PAGESIZE : 16);
HIDDEN(_ehead = .);
} :Head
@ -239,8 +238,8 @@ SECTIONS {
/* Code that needs to be addressable in Real Mode */
*(.text.real)
KEEP(*(SORT_BY_NAME(.sort.text.real.*)))
*(.rodata.real)
KEEP(*(SORT_BY_NAME(.sort.rodata.real.*)))
/**(.rodata.real)
KEEP(*(SORT_BY_NAME(.sort.rodata.real.*)))*/
HIDDEN(_ereal = .);
/*END: realmode addressability guarantee */
@ -282,7 +281,6 @@ SECTIONS {
KEEP(*(.ape.pad.privileged));
HIDDEN(__privileged_start = .);
HIDDEN(__test_end = .);
. += 1;
*(.privileged)
HIDDEN(__privileged_end = .);
@ -308,7 +306,6 @@ SECTIONS {
/* Windows DLL Import Directory */
KEEP(*(.idata.ro));
KEEP(*(SORT_BY_NAME(.idata.ro.*)))
. += 1;
. = ALIGN(__SIZEOF_POINTER__);
PROVIDE_HIDDEN(__init_array_start = .);
@ -381,11 +378,6 @@ SECTIONS {
KEEP(*(SORT_BY_NAME(.sort.bss.*)))
/* eXtreme Low Memory w/ Userspace Remapping */
. = ALIGN(0x1000);
*(.xlm)
. = ALIGN(0x1000);
. = ALIGN(0x10000); /* for brk()/sbrk() allocation */
HIDDEN(_end = .);
PROVIDE_HIDDEN(end = .);
@ -465,6 +457,13 @@ HIDDEN(ape_ram_memsz = ADDR(.bss) + SIZEOF(.bss) - ape_ram_vaddr);
HIDDEN(ape_ram_align = PAGESIZE);
HIDDEN(ape_ram_rva = RVA(ape_ram_vaddr));
HIDDEN(ape_stack_offset = ape_ram_offset + ape_ram_filesz);
HIDDEN(ape_stack_vaddr = 0x700000000000 - STACKSIZE);
HIDDEN(ape_stack_paddr = ape_ram_paddr + ape_ram_filesz);
HIDDEN(ape_stack_filesz = 0);
HIDDEN(ape_stack_memsz = STACKSIZE);
HIDDEN(ape_stack_align = 16);
HIDDEN(ape_note_offset = ape_rom_offset + (ape_note - ape_rom_vaddr));
HIDDEN(ape_note_vaddr = ape_note);
HIDDEN(ape_note_paddr = ape_rom_paddr + ape_note_offset);
@ -500,14 +499,18 @@ SHSTUB2(ape_macho_dd_skip, RVA(ape_macho) / 8);
SHSTUB2(ape_macho_dd_count, (ape_macho_end - ape_macho) / 8);
#endif
#if SupportsWindows() || SupportsUefi()
#if SupportsWindows() || SupportsMetal()
#define LINK_WINDOWS (SupportsWindows() && !DEFINED(EfiMain))
PFSTUB4(ape_pe_offset, ape_pe - ape_mz);
HIDDEN(ape_pe_optsz = ape_pe_sections - (ape_pe + 24));
HIDDEN(ape_pe_shnum = (ape_pe_sections_end - ape_pe_sections) / 40);
HIDDEN(ape_idata_idtsize = ape_idata_idtend - ape_idata_idt);
HIDDEN(ape_idata_iatsize = ape_idata_iatend - ape_idata_iat);
HIDDEN(ape_pe_base = IMAGE_BASE_VIRTUAL);
HIDDEN(ape_idata = LINK_WINDOWS ? RVA(ape_idata_iat) : 0);
HIDDEN(ape_idata_iatsize = LINK_WINDOWS ? ape_idata_iatend - ape_idata_iat : 0);
HIDDEN(ape_idata = LINK_WINDOWS ? RVA(ape_idata_idt) : 0);
HIDDEN(ape_idata_idtsize = LINK_WINDOWS ? ape_idata_idtend - ape_idata_idt : 0);
HIDDEN(v_ntversion = LINK_WINDOWS ? 6 : 1);
HIDDEN(v_ntdllchar = LINK_WINDOWS ? 288 : 0);
HIDDEN(v_ntsubversion = LINK_WINDOWS ? 6 : 5);
HIDDEN(v_ntsubsystem = (LINK_WINDOWS
? (DEFINED(GetMessage)
@ -519,7 +522,7 @@ HIDDEN(ape_pe_entry = LINK_WINDOWS ? WinMain : EfiMain);
#if SupportsMetal()
HIDDEN(v_ape_realsectors =
MIN(REAL_SCRATCH_AREA - IMAGE_BASE_REAL,
MIN(0x70000 - IMAGE_BASE_REAL,
ROUNDUP(RVA(_edata), 4096)) / 512);
HIDDEN(v_ape_realpages = v_ape_realsectors / (4096 / 512));
HIDDEN(v_ape_highsectors =
@ -609,7 +612,7 @@ CHURN(v_ape_realsectors);
#if SupportsXnu()
CHURN(ape_macho);
#endif
#if SupportsWindows() || SupportsUefi()
#if SupportsWindows() || SupportsMetal()
CHURN(ape_mz);
CHURN(ape_pe);
CHURN(ape_pe_offset);