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Support malloc() on bare metal
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.
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ac3b1dfb21
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89 changed files with 900 additions and 1417 deletions
2
libc/sysv/calls/__sys_mmap.s
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libc/sysv/calls/__sys_mmap.s
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@ -0,0 +1,2 @@
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.include "o/libc/sysv/macros.internal.inc"
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.scall __sys_mmap,0x0c50c51dd20c5009,globl,hidden
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@ -1,2 +0,0 @@
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.include "o/libc/sysv/macros.internal.inc"
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.scall sys_mmap,0x0c50c51dd20c5009,globl,hidden
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@ -44,7 +44,7 @@ scall __sys_lstat 0x1b90280282154006 globl hidden # needs __stat2linux(); block
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scall sys_poll 0x0d10fc0d120e6007 globl hidden
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scall sys_ppoll 0xfff06d221ffff10f globl hidden # consider INTON/INTOFF tutorial in examples/unbourne.c
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scall sys_lseek 0x0c70c71de20c7008 globl hidden # netbsd+openbsd:evilpad
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scall sys_mmap 0x0c50c51dd20c5009 globl hidden # netbsd+openbsd:pad
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scall __sys_mmap 0x0c50c51dd20c5009 globl hidden # netbsd+openbsd:pad
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scall sys_msync 0x115100041204101a globl hidden
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scall sys_mprotect 0x04a04a04a204a00a globl hidden
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scall sys_munmap 0x049049049204900b globl hidden
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@ -104,7 +104,7 @@ __systemfive:
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.privileged
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.Lanchorpoint:
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#if SupportsLinux() || SupportsMetal() || SupportsUefi()
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#if SupportsLinux() || SupportsMetal()
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systemfive_linux:
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and $0xfff,%eax
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cmp $0xfff,%eax
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@ -198,10 +198,6 @@ systemfive_xnu:
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testb $XNU,(%rdi) # @see libc/crt/crt.S
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jnz _init_systemfive_xnu
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#endif
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#if SupportsUefi()
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testb $UEFI,(%rdi) # @see ape/ape.S
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jnz _init_systemfive_uefi
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#endif
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#if SupportsMetal()
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testb $METAL,(%rdi) # @see ape/ape.S
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jnz _init_systemfive_metal
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@ -240,13 +236,6 @@ _init_systemfive_metal:
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ezlea syscon_linux,si
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jmp _init_systemfive_os
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#endif
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#if SupportsUefi()
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_init_systemfive_uefi:
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pushb systemfive_linux-.Lanchorpoint
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push $UEFI
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ezlea syscon_linux,si
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jmp _init_systemfive_os
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#endif
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#if SupportsWindows()
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_init_systemfive_windows:
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pushb systemfive_enosys-.Lanchorpoint
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@ -323,20 +312,22 @@ _init_systemfive_magnums:
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// 𝑠𝑙𝑖𝑑𝑒
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#if SupportsSystemv() && !defined(TINY)
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_init_systemfive_stack: # determinism ftw!
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#if SupportsWindows() || SupportsMetal() || SupportsUefi()
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testb $WINDOWS|METAL|UEFI,__hostos(%rip)
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#if SupportsWindows() || SupportsMetal()
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testb $WINDOWS|METAL,__hostos(%rip)
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jnz _init_systemfive_done
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#endif
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push %rdi
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push %rsi
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mov __NR_mmap,%eax
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mov $0x700000000000-STACKSIZE,%rdi
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mov $STACKSIZE,%esi
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movabs $ape_stack_vaddr,%rdi
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mov $ape_stack_memsz,%esi
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mov $PROT_READ|PROT_WRITE,%edx
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mov $MAP_PRIVATE|MAP_FIXED,%r10d
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or MAP_ANONYMOUS,%r10d
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or $-1,%r8d
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xor %r9d,%r9d
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push %rdi # vaddr of stack
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push %rsi # size of stack
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push %r9 # openbsd:pad
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push %r9 # openbsd:align
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#if SupportsOpenbsd()
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@ -351,6 +342,8 @@ _init_systemfive_stack: # determinism ftw!
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syscall
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pop %r9
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pop %r9
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pop %r9 # size of stack
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pop %r11 # vaddr of stack
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jnc 2f
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1: mov %eax,%edi
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mov __NR_exit_group,%eax
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@ -360,17 +353,23 @@ _init_systemfive_stack: # determinism ftw!
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.weak _mmi
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ezlea _mmi,cx
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test %rcx,%rcx
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push %r9 # save the stack size
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jz 3f
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lea -1(%r11,%r9),%r9 # need incl. interval
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shr $16,%r11 # for the stack range
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shr $16,%r9
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movb $1,(%rcx) # _mmi.i
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movl $(0x700000000000-STACKSIZE)>>16,8(%rcx) # _mmi.p[0].x
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movl $(0x700000000000-1)>>16,12(%rcx) # _mmi.p[0].y
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mov %r11d,8(%rcx) # _mmi.p[0].x
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mov %r9d,12(%rcx) # _mmi.p[0].y
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mov %edx,20(%rcx) # _mmi.p[0].prot
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mov %r10d,24(%rcx) # _mmi.p[0].flags
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3: pop %rsi
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3: pop %r9 # restore stack size
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pop %rsi
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pop %rdi
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leave
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pop %rcx
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lea STACKSIZE-16(%rax),%rsp # openbsd:stackbound
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lea (%rax,%r9),%rsp
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sub $ape_stack_align,%rsp # openbsd:stackbound
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mov %rbp,(%rsp)
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push %rcx
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push %rbp
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@ -414,7 +413,7 @@ syscon_end:
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.type syscon_end,@object
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.globl syscon_start
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.globl syscon_end
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#if SupportsLinux() || SupportsMetal() || SupportsUefi()
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#if SupportsLinux() || SupportsMetal()
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.section .sort.rodata.syscon.linux.1,"a",@progbits
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.align 1
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syscon_linux:/*
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@ -468,3 +467,7 @@ syscon_windows:/*
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.type syscon_windows,@object
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.globl syscon_windows
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#endif
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.weak ape_stack_vaddr
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.weak ape_stack_memsz
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.weak ape_stack_align
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