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https://github.com/tinygo-org/tinygo.git
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Matthew Hiles
e6e7250a47
* runtime: extract Windows PE globals scan helper * Update src/runtime/os_windows_pe.go * run goimports
62 lines
2.0 KiB
Go
62 lines
2.0 KiB
Go
package runtime
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import "unsafe"
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const GOOS = "windows"
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//export GetModuleHandleExA
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func _GetModuleHandleExA(dwFlags uint32, lpModuleName unsafe.Pointer, phModule **exeHeader) bool
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// Mark global variables.
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// Unfortunately, the linker doesn't provide symbols for the start and end of
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// the data/bss sections. Therefore these addresses need to be determined at
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// runtime. This might seem complex and it kind of is, but it only compiles to
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// around 160 bytes of amd64 instructions.
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// Most of this function is based on the documentation in
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// https://docs.microsoft.com/en-us/windows/win32/debug/pe-format.
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func findGlobals(found func(start, end uintptr)) {
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// Constants used in this function.
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const (
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// https://docs.microsoft.com/en-us/windows/win32/api/libloaderapi/nf-libloaderapi-getmodulehandleexa
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GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT = 0x00000002
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)
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if module == nil {
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// Obtain a handle to the currently executing image. What we're getting
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// here is really just __ImageBase, but it's probably better to obtain
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// it using GetModuleHandle to account for ASLR etc.
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result := _GetModuleHandleExA(GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT, nil, &module)
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if gcAsserts && (!result || module.signature != 0x5A4D) { // 0x4D5A is "MZ"
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runtimePanic("cannot get module handle")
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}
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}
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findGlobalsForPE(found)
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}
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type systeminfo struct {
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anon0 [4]byte
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dwpagesize uint32
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lpminimumapplicationaddress *byte
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lpmaximumapplicationaddress *byte
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dwactiveprocessormask uintptr
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dwnumberofprocessors uint32
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dwprocessortype uint32
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dwallocationgranularity uint32
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wprocessorlevel uint16
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wprocessorrevision uint16
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}
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//export GetSystemInfo
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func _GetSystemInfo(lpSystemInfo unsafe.Pointer)
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//go:linkname syscall_Getpagesize syscall.Getpagesize
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func syscall_Getpagesize() int {
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var info systeminfo
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_GetSystemInfo(unsafe.Pointer(&info))
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return int(info.dwpagesize)
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}
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//export _errno
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func libc_errno_location() *int32
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