mirror of
https://github.com/golang/go
synced 2024-10-05 08:21:22 -06:00
19fd5c787f
That is, move the pc/ln table and the symbol table into the read-only data segment. This eliminates the need for a special load command to map the symbol table into memory, which makes the information available on systems that couldn't handle the magic load to 0x99000000, like NaCl and ARM QEMU and Linux without config_highmem=y. It also eliminates an #ifdef and some clumsy code to find the symbol table on Windows. The bad news is that the binary appears to be bigger than it used to be. This is not actually the case, though: the same amount of data is being mapped into memory as before, and the tables are still read-only, so they're still shared across multiple instances of the binary as they were before. The difference is just that the tables aren't squirreled away in some section that "size" doesn't know to look at. This is a checkpoint. It probably breaks Windows and breaks NaCl more than it used to be broken, but those will be fixed. The logic involving -s needs to be revisited too. Fixes #871. R=ken2 CC=golang-dev https://golang.org/cl/2587041
269 lines
5.4 KiB
C
269 lines
5.4 KiB
C
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "runtime.h"
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#include "os.h"
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extern void *get_kernel_module(void);
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// Also referenced by external packages
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void *CloseHandle;
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void *ExitProcess;
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void *GetStdHandle;
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void *SetEvent;
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void *WriteFile;
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void *VirtualAlloc;
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void *VirtualFree;
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void *LoadLibraryEx;
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void *GetProcAddress;
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void *GetLastError;
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void *SetLastError;
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static void *CreateEvent;
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static void *CreateThread;
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static void *WaitForSingleObject;
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static void*
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get_proc_addr2(byte *base, byte *name)
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{
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byte *pe_header, *exports;
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uint32 entries, *addr, *names, i;
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uint16 *ordinals;
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pe_header = base+*(uint32*)(base+0x3c);
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exports = base+*(uint32*)(pe_header+0x78);
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entries = *(uint32*)(exports+0x18);
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addr = (uint32*)(base+*(uint32*)(exports+0x1c));
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names = (uint32*)(base+*(uint32*)(exports+0x20));
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ordinals = (uint16*)(base+*(uint32*)(exports+0x24));
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for(i=0; i<entries; i++) {
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byte *s = base+names[i];
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if(!strcmp(name, s))
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break;
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}
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if(i == entries)
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return 0;
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return base+addr[ordinals[i]];
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}
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void
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osinit(void)
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{
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void *base;
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base = get_kernel_module();
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GetProcAddress = get_proc_addr2(base, (byte*)"GetProcAddress");
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LoadLibraryEx = get_proc_addr2(base, (byte*)"LoadLibraryExA");
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CloseHandle = get_proc_addr("kernel32.dll", "CloseHandle");
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CreateEvent = get_proc_addr("kernel32.dll", "CreateEventA");
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CreateThread = get_proc_addr("kernel32.dll", "CreateThread");
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ExitProcess = get_proc_addr("kernel32.dll", "ExitProcess");
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GetStdHandle = get_proc_addr("kernel32.dll", "GetStdHandle");
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SetEvent = get_proc_addr("kernel32.dll", "SetEvent");
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VirtualAlloc = get_proc_addr("kernel32.dll", "VirtualAlloc");
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VirtualFree = get_proc_addr("kernel32.dll", "VirtualFree");
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WaitForSingleObject = get_proc_addr("kernel32.dll", "WaitForSingleObject");
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WriteFile = get_proc_addr("kernel32.dll", "WriteFile");
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GetLastError = get_proc_addr("kernel32.dll", "GetLastError");
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SetLastError = get_proc_addr("kernel32.dll", "SetLastError");
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}
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// The arguments are strings.
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void*
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get_proc_addr(void *library, void *name)
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{
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void *base;
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base = stdcall(LoadLibraryEx, 3, library, 0, 0);
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return stdcall(GetProcAddress, 2, base, name);
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}
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void
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windows_goargs(void)
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{
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extern Slice os·Args;
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extern Slice os·Envs;
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void *gcl, *clta, *ges, *fes;
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uint16 *cmd, *env, **argv;
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String *gargv;
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String *genvv;
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int32 i, argc, envc;
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uint16 *envp;
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gcl = get_proc_addr("kernel32.dll", "GetCommandLineW");
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clta = get_proc_addr("shell32.dll", "CommandLineToArgvW");
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ges = get_proc_addr("kernel32.dll", "GetEnvironmentStringsW");
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fes = get_proc_addr("kernel32.dll", "FreeEnvironmentStringsW");
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cmd = stdcall(gcl, 0);
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env = stdcall(ges, 0);
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argv = stdcall(clta, 2, cmd, &argc);
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envc = 0;
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for(envp=env; *envp; envc++)
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envp += findnullw(envp)+1;
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gargv = malloc(argc*sizeof gargv[0]);
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genvv = malloc(envc*sizeof genvv[0]);
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for(i=0; i<argc; i++)
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gargv[i] = gostringw(argv[i]);
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os·Args.array = (byte*)gargv;
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os·Args.len = argc;
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os·Args.cap = argc;
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envp = env;
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for(i=0; i<envc; i++) {
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genvv[i] = gostringw(envp);
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envp += findnullw(envp)+1;
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}
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os·Envs.array = (byte*)genvv;
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os·Envs.len = envc;
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os·Envs.cap = envc;
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stdcall(fes, 1, env);
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}
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void
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exit(int32 code)
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{
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stdcall(ExitProcess, 1, code);
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}
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int32
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write(int32 fd, void *buf, int32 n)
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{
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void *handle;
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uint32 written;
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written = 0;
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switch(fd) {
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case 1:
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handle = stdcall(GetStdHandle, 1, -11);
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break;
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case 2:
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handle = stdcall(GetStdHandle, 1, -12);
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break;
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default:
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return -1;
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}
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stdcall(WriteFile, 5, handle, buf, n, &written, 0);
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return written;
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}
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// Thread-safe allocation of an event.
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static void
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initevent(void **pevent)
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{
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void *event;
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event = stdcall(CreateEvent, 4, 0, 0, 0, 0);
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if(!casp(pevent, 0, event)) {
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// Someone else filled it in. Use theirs.
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stdcall(CloseHandle, 1, event);
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}
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}
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static void
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eventlock(Lock *l)
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{
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// Allocate event if needed.
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if(l->event == 0)
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initevent(&l->event);
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if(xadd(&l->key, 1) > 1) // someone else has it; wait
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stdcall(WaitForSingleObject, 2, l->event, -1);
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}
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static void
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eventunlock(Lock *l)
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{
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if(xadd(&l->key, -1) > 0) // someone else is waiting
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stdcall(SetEvent, 1, l->event);
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}
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void
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lock(Lock *l)
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{
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if(m->locks < 0)
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throw("lock count");
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m->locks++;
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eventlock(l);
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}
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void
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unlock(Lock *l)
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{
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m->locks--;
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if(m->locks < 0)
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throw("lock count");
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eventunlock(l);
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}
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void
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destroylock(Lock *l)
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{
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if(l->event != 0)
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stdcall(CloseHandle, 1, l->event);
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}
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void
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noteclear(Note *n)
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{
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eventlock(&n->lock);
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}
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void
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notewakeup(Note *n)
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{
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eventunlock(&n->lock);
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}
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void
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notesleep(Note *n)
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{
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eventlock(&n->lock);
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eventunlock(&n->lock); // Let other sleepers find out too.
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}
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void
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newosproc(M *m, G *g, void *stk, void (*fn)(void))
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{
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USED(stk);
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USED(g); // assuming g = m->g0
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USED(fn); // assuming fn = mstart
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stdcall(CreateThread, 6, 0, 0, tstart_stdcall, m, 0, 0);
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}
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// Called to initialize a new m (including the bootstrap m).
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void
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minit(void)
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{
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}
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// Calling stdcall on os stack.
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#pragma textflag 7
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void *
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stdcall(void *fn, int32 count, ...)
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{
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return stdcall_raw(fn, count, (uintptr*)(&count + 1));
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}
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void
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syscall(StdcallParams *p)
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{
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uintptr a;
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·entersyscall();
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// TODO(brainman): Move calls to SetLastError and GetLastError
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// to stdcall_raw to speed up syscall.
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a = 0;
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stdcall_raw(SetLastError, 1, &a);
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p->r = (uintptr)stdcall_raw((void*)p->fn, p->n, p->args);
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p->err = (uintptr)stdcall_raw(GetLastError, 0, &a);
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·exitsyscall();
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}
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