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all: add macOS support

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This commit is contained in:
Ayke van Laethem
2019-02-09 23:18:17 +01:00
committed by Ron Evans
parent 2d5bc836f5
commit 0b212cf2f6
11 changed files with 119 additions and 52 deletions
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compiler/compiler.go
+1 -1
View File
@@ -1353,7 +1353,7 @@ func (c *Compiler) parseCall(frame *Frame, instr *ssa.CallCommon) (llvm.Value, e
}
switch fn.RelString(nil) {
case "syscall.Syscall", "syscall.Syscall6":
case "syscall.Syscall", "syscall.Syscall6", "syscall.Syscall9":
return c.emitSyscall(frame, instr)
}
compiler/syscall.go
+55 -18
View File
@@ -17,7 +17,20 @@ func (c *Compiler) emitSyscall(frame *Frame, call *ssa.CallCommon) (llvm.Value,
num, _ := constant.Uint64Val(call.Args[0].(*ssa.Const).Value)
var syscallResult llvm.Value
switch {
case c.GOARCH == "amd64" && c.GOOS == "linux":
case c.GOARCH == "amd64":
if c.GOOS == "darwin" {
// Darwin adds this magic number to system call numbers:
//
// > Syscall classes for 64-bit system call entry.
// > For 64-bit users, the 32-bit syscall number is partitioned
// > with the high-order bits representing the class and low-order
// > bits being the syscall number within that class.
// > The high-order 32-bits of the 64-bit syscall number are unused.
// > All system classes enter the kernel via the syscall instruction.
//
// Source: https://opensource.apple.com/source/xnu/xnu-792.13.8/osfmk/mach/i386/syscall_sw.h
num += 0x2000000
}
// Sources:
// https://stackoverflow.com/a/2538212
// https://en.wikibooks.org/wiki/X86_Assembly/Interfacing_with_Linux#syscall
@@ -34,6 +47,9 @@ func (c *Compiler) emitSyscall(frame *Frame, call *ssa.CallCommon) (llvm.Value,
"{r10}",
"{r8}",
"{r9}",
"{r11}",
"{r12}",
"{r13}",
}[i]
llvmValue, err := c.parseExpr(frame, arg)
if err != nil {
@@ -119,21 +135,42 @@ func (c *Compiler) emitSyscall(frame *Frame, call *ssa.CallCommon) (llvm.Value,
default:
return llvm.Value{}, c.makeError(call.Pos(), "unknown GOOS/GOARCH for syscall: "+c.GOOS+"/"+c.GOARCH)
}
// Return values: r0, r1, err uintptr
// Pseudocode:
// var err uintptr
// if syscallResult < 0 && syscallResult > -4096 {
// err = -syscallResult
// }
// return syscallResult, 0, err
zero := llvm.ConstInt(c.uintptrType, 0, false)
inrange1 := c.builder.CreateICmp(llvm.IntSLT, syscallResult, llvm.ConstInt(c.uintptrType, 0, false), "")
inrange2 := c.builder.CreateICmp(llvm.IntSGT, syscallResult, llvm.ConstInt(c.uintptrType, 0xfffffffffffff000, true), "") // -4096
hasError := c.builder.CreateAnd(inrange1, inrange2, "")
errResult := c.builder.CreateSelect(hasError, c.builder.CreateNot(syscallResult, ""), zero, "syscallError")
retval := llvm.Undef(llvm.StructType([]llvm.Type{c.uintptrType, c.uintptrType, c.uintptrType}, false))
retval = c.builder.CreateInsertValue(retval, syscallResult, 0, "")
retval = c.builder.CreateInsertValue(retval, zero, 1, "")
retval = c.builder.CreateInsertValue(retval, errResult, 2, "")
return retval, nil
switch c.GOOS {
case "linux":
// Return values: r0, r1 uintptr, err Errno
// Pseudocode:
// var err uintptr
// if syscallResult < 0 && syscallResult > -4096 {
// err = -syscallResult
// }
// return syscallResult, 0, err
zero := llvm.ConstInt(c.uintptrType, 0, false)
inrange1 := c.builder.CreateICmp(llvm.IntSLT, syscallResult, llvm.ConstInt(c.uintptrType, 0, false), "")
inrange2 := c.builder.CreateICmp(llvm.IntSGT, syscallResult, llvm.ConstInt(c.uintptrType, 0xfffffffffffff000, true), "") // -4096
hasError := c.builder.CreateAnd(inrange1, inrange2, "")
errResult := c.builder.CreateSelect(hasError, c.builder.CreateSub(zero, syscallResult, ""), zero, "syscallError")
retval := llvm.Undef(llvm.StructType([]llvm.Type{c.uintptrType, c.uintptrType, c.uintptrType}, false))
retval = c.builder.CreateInsertValue(retval, syscallResult, 0, "")
retval = c.builder.CreateInsertValue(retval, zero, 1, "")
retval = c.builder.CreateInsertValue(retval, errResult, 2, "")
return retval, nil
case "darwin":
// Return values: r0, r1 uintptr, err Errno
// Pseudocode:
// var err uintptr
// if syscallResult != 0 {
// err = syscallResult
// }
// return syscallResult, 0, err
zero := llvm.ConstInt(c.uintptrType, 0, false)
hasError := c.builder.CreateICmp(llvm.IntNE, syscallResult, llvm.ConstInt(c.uintptrType, 0, false), "")
errResult := c.builder.CreateSelect(hasError, syscallResult, zero, "syscallError")
retval := llvm.Undef(llvm.StructType([]llvm.Type{c.uintptrType, c.uintptrType, c.uintptrType}, false))
retval = c.builder.CreateInsertValue(retval, syscallResult, 0, "")
retval = c.builder.CreateInsertValue(retval, zero, 1, "")
retval = c.builder.CreateInsertValue(retval, errResult, 2, "")
return retval, nil
default:
return llvm.Value{}, c.makeError(call.Pos(), "unknown GOOS/GOARCH for syscall: "+c.GOOS+"/"+c.GOARCH)
}
}