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Add NetBSD support

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This commit is contained in:
Justine Tunney 2021-02-05 06:16:20 -08:00
parent 2fdc19e7a7
commit 23ae9dfceb
4020 changed files with 8955 additions and 8128 deletions
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53
libc/sysv/systemfive.S
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@ -106,9 +106,9 @@ __systemfive:
.text.syscall
.Lanchorpoint:
systemfive.linux:
movswl %ax,%eax # gnu/systemd ordinal is first word
test %eax,%eax # sign extend to optimize code size
js systemfive.enosys # test for syscalls.sh ordinal ffff
and $0xfff,%eax
cmp $0xfff,%eax
je systemfive.enosys
mov %rcx,%r10 # syscall instruction clobbers %rcx
push %rbp # linux never reads args from stack
mov %rsp,%rbp # having frame will help backtraces
@ -132,33 +132,40 @@ systemfive.enosys:
mov ENOSYS(%rip),%eax
jmp systemfive.errno
.endfn systemfive.enosys,globl,hidden
systemfive.netbsd:
shr $4*13,%rax
jmp systemfive.bsdscrub
.endfn systemfive.openbsd,globl,hidden
systemfive.openbsd:
shr $48,%rax
jmp systemfive.bsd
shr $4*10,%rax
jmp systemfive.bsdscrub
.endfn systemfive.openbsd,globl,hidden
systemfive.freebsd:
shr $32,%rax
shr $4*7,%rax
movzwl %ax,%eax
/ 𝑠𝑙𝑖𝑑𝑒
.endfn systemfive.freebsd,globl,hidden
systemfive.bsdscrub:
and $0xfff,%eax
/ 𝑠𝑙𝑖𝑑𝑒
.endfn systemfive.bsdscrub,globl,hidden
systemfive.bsd:
cmp $0xfff,%ax
jae systemfive.enosys
je systemfive.enosys
mov %rcx,%r10 # note: we do not create a stack frame
syscall # bsd will need arg on stack sometimes
jc systemfive.errno # bsd sets carry flag if %rax is errno
ret
.endfn systemfive.bsd
systemfive.xnu:
/ 0x????????2153???? # how syscalls.sh encodes xnu ordinals
/ │└┴┴─┐
/ └┐ ├┬┐
/ 0x?????????2153??? # how syscalls.sh encodes xnu ordinals
/ │└┴┴┐
/ │ ├┬┐
/ 0x0000000002000153 # how xnu wants ordinals to be encoded
mov %eax,%r11d
shr $4*7,%r11d
shl $4*6,%r11d
shl $4*1,%eax
shr $4*5,%eax
and $0x0f000000,%r11d
shl $8,%eax
shr $20,%eax
or %r11d,%eax
jmp systemfive.bsd
.endfn systemfive.xnu,globl,hidden
@ -186,6 +193,12 @@ systemfive.xnu:
jnz systemfive.init.windows
cmpq $0,(%r15) # OpenBSD doesn't have auxv
je systemfive.init.openbsd
xor %eax,%eax
0: cmpq $2014,(%r15,%rax,8) # NetBSD's distinctive AT_EXECFN
je systemfive.init.netbsd
cmpq $0,(%r15,%rax,8)
lea 2(%eax),%eax
jnz 0b
/ default state is safe state
/ 𝑠𝑙𝑖𝑑𝑒
systemfive.init.linux:
@ -213,6 +226,11 @@ systemfive.init.openbsd:
push $OPENBSD
ezlea syscon.openbsd,si
jmp systemfive.init.os
systemfive.init.netbsd:
pushb systemfive.netbsd-.Lanchorpoint
push $NETBSD
ezlea syscon.netbsd,si
jmp systemfive.init.os
systemfive.init.xnu:
pushb systemfive.xnu-.Lanchorpoint
push $XNU
@ -360,6 +378,11 @@ syscon.freebsd:/*
.section .sort.rodata.syscon.openbsd.1,"a",@progbits
.align 1
syscon.openbsd:/*
...decentralized leb128...
*/.previous
.section .sort.rodata.syscon.netbsd.1,"a",@progbits
.align 1
syscon.netbsd:/*
...decentralized leb128...
*/.previous
.section .sort.rodata.syscon.windows.1,"a",@progbits
@ -374,6 +397,7 @@ syscon.windows:/*
.type syscon.xnu,@object
.type syscon.freebsd,@object
.type syscon.openbsd,@object
.type syscon.netbsd,@object
.type syscon.windows,@object
.globl syscon.start
@ -382,4 +406,5 @@ syscon.windows:/*
.globl syscon.xnu
.globl syscon.freebsd
.globl syscon.openbsd
.globl syscon.netbsd
.globl syscon.windows