mirror of
https://github.com/jart/cosmopolitan.git
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Make improvements
This change progresses our AARCH64 support:
- The AARCH64 build and tests are now passing
- Add 128-bit floating-point support to printf()
- Fix clone() so it initializes cosmo's x28 TLS register
- Fix TLS memory layout issue with aarch64 _Alignas vars
- Revamp microbenchmarking tools so they work on aarch64
- Make some subtle improvements to aarch64 crash reporting
- Make kisdangerous() memory checks more accurate on aarch64
- Remove sys_open() since it's not available on Linux AARCH64
This change makes general improvements to Cosmo and Redbean:
- Introduce GetHostIsa() function in Redbean
- You can now feature check using pledge(0, 0)
- You can now feature check using unveil("",0)
- Refactor some more x86-specific asm comments
- Refactor and write docs for some libm functions
- Make the mmap() API behave more similar to Linux
- Fix WIFSIGNALED() which wrongly returned true for zero
- Rename some obscure cosmo keywords from noFOO to dontFOO
This commit is contained in:
Justine Tunney
parent
5655c9a4e7
commit
8f522cb702
116 changed files with 1194 additions and 1025 deletions
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@ -107,52 +107,52 @@ __pid: .quad 0
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systemfive_cp:
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push %rbp
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mov %rsp,%rbp # so backtraces work
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systemfive_cancellable: # our pthread_cancel() miracle code
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cmpb $0,__tls_enabled(%rip) # inspired by the musl libc design!
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je 1f # we handle linux and bsd together!
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mov %fs:0,%r10 # CosmoTib::tib_self
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mov 0x28(%r10),%r10 # CosmoTib::tib_pthread
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test %r10,%r10 # is it a posix thread?
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jz 1f # it's spawn() probably
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testb $PT_NOCANCEL,0x00(%r10) # PosixThread::flags
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jnz 1f # canceler no cancelling
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mov %rsp,%rbp // so backtraces work
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systemfive_cancellable: // our pthread_cancel() miracle code
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cmpb $0,__tls_enabled(%rip) // inspired by the musl libc design!
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je 1f // we handle linux and bsd together!
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mov %fs:0,%r10 // CosmoTib::tib_self
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mov 0x28(%r10),%r10 // CosmoTib::tib_pthread
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test %r10,%r10 // is it a posix thread?
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jz 1f // it's spawn() probably
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testb $PT_NOCANCEL,0x00(%r10) // PosixThread::flags
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jnz 1f // canceler no cancelling
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#if IsModeDbg()
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testb $PT_INCANCEL,0x00(%r10)
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jz 5f
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#endif
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cmp $0,0x04(%r10) # PosixThread::cancelled
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jne systemfive_cancel # we will tail call below
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1: mov %rcx,%r10 # move the fourth argument
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clc # no cancellable system calls exist
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syscall # that have 7+ args on the bsd OSes
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systemfive_cancellable_end: # i/o calls park here for long time
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cmp $0,0x04(%r10) // PosixThread::cancelled
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jne systemfive_cancel // we will tail call below
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1: mov %rcx,%r10 // move the fourth argument
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clc // no cancellable system calls exist
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syscall // that have 7+ args on the bsd OSes
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systemfive_cancellable_end: // i/o calls park here for long time
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pop %rbp
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jnc 2f
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neg %rax # turns bsd errno to system v errno
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2: cmp $-4095,%rax # but we still check again on eintr
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jae 3f # branch because system call failed
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ret # done if the system call succeeded
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3: neg %eax # now examine the nature of failure
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cmp EINTR(%rip),%eax # did the SIGTHR cancel our IO call
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jne systemfive_errno # werent interrupted by OnSigCancel
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cmpb $0,__tls_enabled(%rip) # make sure it's safe to grab %fs:0
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je systemfive_errno # tls is disabled we can't continue
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mov %fs:0,%rcx # CosmoTib::tib_self
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mov 0x28(%rcx),%rcx # CosmoTib::tib_pthread
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test %rcx,%rcx # is it a posix thread?
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jz systemfive_errno # it's spawn() probably
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testb $PT_NOCANCEL,0x00(%rcx) # PosixThread::flags
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jnz systemfive_errno # cancellation is disabled
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cmp $0,0x04(%rcx) # PosixThread::cancelled
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je systemfive_errno # we aren't actually cancelled
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jmp 4f # now we are in fact cancelled
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systemfive_cancel: # SIGTHR will jump here too
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neg %rax // turns bsd errno to system v errno
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2: cmp $-4095,%rax // but we still check again on eintr
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jae 3f // branch because system call failed
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ret // done if the system call succeeded
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3: neg %eax // now examine the nature of failure
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cmp EINTR(%rip),%eax // did the SIGTHR cancel our IO call
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jne systemfive_errno // werent interrupted by OnSigCancel
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cmpb $0,__tls_enabled(%rip) // make sure it's safe to grab %fs:0
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je systemfive_errno // tls is disabled we can't continue
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mov %fs:0,%rcx // CosmoTib::tib_self
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mov 0x28(%rcx),%rcx // CosmoTib::tib_pthread
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test %rcx,%rcx // is it a posix thread?
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jz systemfive_errno // it's spawn() probably
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testb $PT_NOCANCEL,0x00(%rcx) // PosixThread::flags
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jnz systemfive_errno // cancellation is disabled
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cmp $0,0x04(%rcx) // PosixThread::cancelled
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je systemfive_errno // we aren't actually cancelled
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jmp 4f // now we are in fact cancelled
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systemfive_cancel: // SIGTHR will jump here too
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pop %rbp
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4: jmp _pthread_cancel_sys # tail call
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.weak _pthread_cancel_sys # must be linked if we're cancelled
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4: jmp _pthread_cancel_sys // tail call
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.weak _pthread_cancel_sys // must be linked if we're cancelled
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#if IsModeDbg()
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not_a_cancellation_point: # need BEGIN/END_CANCELLATION_POINT
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not_a_cancellation_point: // need BEGIN/END_CANCELLATION_POINT
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nop
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.weak report_cancellation_point
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5: ezlea report_cancellation_point,cx
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@ -170,18 +170,18 @@ not_a_cancellation_point: # need BEGIN/END_CANCELLATION_POINT
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.Lanchorpoint:
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#if SupportsLinux() || SupportsMetal()
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systemfive_linux:
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and $0xfff,%eax # remove nonlinux bits from ordinal
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cmp $0xfff,%eax # checks if unsupported by platform
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je systemfive_enosys # never taken branches cost nothing
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btr $11,%eax # 0x800 means a call is cancellable
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jc systemfive_cp # it is handled by the holiest code
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mov %rcx,%r10 # syscall instruction clobbers %rcx
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push %rbp # linux never reads args from stack
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mov %rsp,%rbp # having frame will help backtraces
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syscall # this is known as a context switch
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pop %rbp # next we check to see if it failed
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cmp $-4095,%rax # system five nexgen32e abi § a.2.1
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jae systemfive_error # encodes errno as neg return value
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and $0xfff,%eax // remove nonlinux bits from ordinal
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cmp $0xfff,%eax // checks if unsupported by platform
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je systemfive_enosys // never taken branches cost nothing
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btr $11,%eax // 0x800 means a call is cancellable
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jc systemfive_cp // it is handled by the holiest code
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mov %rcx,%r10 // syscall instruction clobbers %rcx
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push %rbp // linux never reads args from stack
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mov %rsp,%rbp // having frame will help backtraces
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syscall // this is known as a context switch
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pop %rbp // next we check to see if it failed
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cmp $-4095,%rax // system five nexgen32e abi § a.2.1
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jae systemfive_error // encodes errno as neg return value
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ret
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.endfn systemfive_linux,globl,hidden
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systemfive_error:
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@ -192,9 +192,9 @@ systemfive_error:
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systemfive_errno:
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xchg %eax,%ecx
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.errno
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mov %ecx,(%rax) # normalize to c library convention
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push $-1 # negative one is only error result
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pop %rax # the push pop is to save code size
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mov %ecx,(%rax) // normalize to c library convention
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push $-1 // negative one is only error result
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pop %rax // the push pop is to save code size
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ret
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.endfn systemfive_errno,globl,hidden
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systemfive_enosys:
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@ -228,20 +228,20 @@ systemfive_bsdscrub:
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systemfive_bsd:
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cmp $0xfff,%ax
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je systemfive_enosys
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btr $11,%eax # checks/reset the 800 cancellable bit
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btr $11,%eax // checks/reset the 800 cancellable bit
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jc systemfive_cp
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mov %rcx,%r10
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syscall # bsd will need arg on stack sometimes
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jc systemfive_errno # bsd sets carry flag if %rax is errno
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syscall // bsd will need arg on stack sometimes
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jc systemfive_errno // bsd sets carry flag if %rax is errno
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ret
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.endfn systemfive_bsd
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#endif
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#if SupportsXnu()
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systemfive_xnu:
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// 0x?????????2153??? # how syscalls.sh encodes xnu ordinals
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// 0x?????????2153??? // how syscalls.sh encodes xnu ordinals
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// │└┴┴┐
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// │ ├┬┐
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// 0x0000000002000153 # how xnu wants ordinals to be encoded
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// 0x0000000002000153 // how xnu wants ordinals to be encoded
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mov %eax,%r11d
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and $0x0f000000,%r11d
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shl $8,%eax
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@ -271,10 +271,10 @@ systemfive_xnu:
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// set by libc/crt/crt.S for XNU/FreeBSD
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// set by libc/nt/winmain.greg.c for New Technology
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test %eax,%eax
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jnz _init_systemfive_detected # os is already known
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jnz _init_systemfive_detected // os is already known
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#endif
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#if SupportsOpenbsd()
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cmpq $0,(%r15) # OpenBSD has no auxv
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cmpq $0,(%r15) // OpenBSD has no auxv
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jnz 0f
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mov $_HOSTOPENBSD,%al
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jmp _init_systemfive_detected
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@ -282,7 +282,7 @@ systemfive_xnu:
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#endif
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#if SupportsNetbsd()
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xor %ecx,%ecx
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0: cmpq $2014,(%r15,%rcx,8) # NetBSD's AT_EXECFN
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0: cmpq $2014,(%r15,%rcx,8) // NetBSD's AT_EXECFN
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jne 1f
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mov $_HOSTNETBSD,%al
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jmp _init_systemfive_detected
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@ -371,7 +371,7 @@ _init_systemfive_magnums:
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xor %ebx,%ebx
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xor %ecx,%ecx
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xor %edx,%edx
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3: lodsb # decodes uleb128
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3: lodsb // decodes uleb128
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movzbl %al,%edx
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and $127,%dl
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shl %cl,%rdx
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@ -422,23 +422,23 @@ _init_systemfive_pid:
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#endif
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#if SupportsBsd() && !defined(TINY)
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_init_systemfive_sigsys:
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testb IsBsd() # BSDs will trap SIGSYS!
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jz 1f # We want ENOSYS instead
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push %rdi # XNU removed some calls
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push %rsi # in past, so this makes
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xor %eax,%eax # troubleshooting easier
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push %rax # but it's non-essential
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testb IsBsd() // BSDs will trap SIGSYS!
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jz 1f // We want ENOSYS instead
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push %rdi // XNU removed some calls
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push %rsi // in past, so this makes
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xor %eax,%eax // troubleshooting easier
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push %rax // but it's non-essential
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push %rax
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push %rax
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push %rax
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push %rax
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push $SIG_IGN # sigaction_meta size 48
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mov __NR_sigaction,%eax # mag
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mov SIGSYS,%edi # sig
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mov %rsp,%rsi # new
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xor %edx,%edx # old
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mov $8,%r10d # for linux
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xor %r8d,%r8d # for netbsd
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push $SIG_IGN // sigaction_meta size 48
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mov __NR_sigaction,%eax // mag
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mov SIGSYS,%edi // sig
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mov %rsp,%rsi // new
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xor %edx,%edx // old
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mov $8,%r10d // for linux
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xor %r8d,%r8d // for netbsd
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syscall
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add $6*8,%rsp
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pop %rsi
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