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Code Issues Packages Projects Releases 6 Wiki Activity

compiler: support non-constant syscall numbers

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Not all syscalls use constant numbers.
This commit is contained in:
Ayke van Laethem
2019-06-08 01:31:27 +02:00
committed by Ron Evans
parent 8e5731aee7
commit aa8957dd05
1 changed files with 5 additions and 6 deletions
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compiler/syscall.go
+5 -6
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@@ -4,7 +4,6 @@ package compiler
// compiler builtins. // compiler builtins.
import ( import (
"go/constant"
"strconv" "strconv"
"golang.org/x/tools/go/ssa" "golang.org/x/tools/go/ssa"
@@ -14,7 +13,7 @@ import (
// emitSyscall emits an inline system call instruction, depending on the target // emitSyscall emits an inline system call instruction, depending on the target
// OS/arch. // OS/arch.
func (c *Compiler) emitSyscall(frame *Frame, call *ssa.CallCommon) (llvm.Value, error) { func (c *Compiler) emitSyscall(frame *Frame, call *ssa.CallCommon) (llvm.Value, error) {
num, _ := constant.Uint64Val(call.Args[0].(*ssa.Const).Value) num := c.getValue(frame, call.Args[0])
var syscallResult llvm.Value var syscallResult llvm.Value
switch { switch {
case c.GOARCH == "amd64": case c.GOARCH == "amd64":
@@ -29,12 +28,12 @@ func (c *Compiler) emitSyscall(frame *Frame, call *ssa.CallCommon) (llvm.Value,
// > All system classes enter the kernel via the syscall instruction. // > 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 // Source: https://opensource.apple.com/source/xnu/xnu-792.13.8/osfmk/mach/i386/syscall_sw.h
num += 0x2000000 num = c.builder.CreateOr(num, llvm.ConstInt(c.uintptrType, 0x2000000, false), "")
} }
// Sources: // Sources:
// https://stackoverflow.com/a/2538212 // https://stackoverflow.com/a/2538212
// https://en.wikibooks.org/wiki/X86_Assembly/Interfacing_with_Linux#syscall // https://en.wikibooks.org/wiki/X86_Assembly/Interfacing_with_Linux#syscall
args := []llvm.Value{llvm.ConstInt(c.uintptrType, num, false)} args := []llvm.Value{num}
argTypes := []llvm.Type{c.uintptrType} argTypes := []llvm.Type{c.uintptrType}
// Constraints will look something like: // Constraints will look something like:
// "={rax},0,{rdi},{rsi},{rdx},{r10},{r8},{r9},~{rcx},~{r11}" // "={rax},0,{rdi},{rsi},{rdx},{r10},{r8},{r9},~{rcx},~{r11}"
@@ -81,7 +80,7 @@ func (c *Compiler) emitSyscall(frame *Frame, call *ssa.CallCommon) (llvm.Value,
args = append(args, llvmValue) args = append(args, llvmValue)
argTypes = append(argTypes, llvmValue.Type()) argTypes = append(argTypes, llvmValue.Type())
} }
args = append(args, llvm.ConstInt(c.uintptrType, num, false)) args = append(args, num)
argTypes = append(argTypes, c.uintptrType) argTypes = append(argTypes, c.uintptrType)
constraints += ",{r7}" // syscall number constraints += ",{r7}" // syscall number
for i := len(call.Args) - 1; i < 4; i++ { for i := len(call.Args) - 1; i < 4; i++ {
@@ -111,7 +110,7 @@ func (c *Compiler) emitSyscall(frame *Frame, call *ssa.CallCommon) (llvm.Value,
args = append(args, llvmValue) args = append(args, llvmValue)
argTypes = append(argTypes, llvmValue.Type()) argTypes = append(argTypes, llvmValue.Type())
} }
args = append(args, llvm.ConstInt(c.uintptrType, num, false)) args = append(args, num)
argTypes = append(argTypes, c.uintptrType) argTypes = append(argTypes, c.uintptrType)
constraints += ",{x8}" // syscall number constraints += ",{x8}" // syscall number
for i := len(call.Args) - 1; i < 8; i++ { for i := len(call.Args) - 1; i < 8; i++ {