8l: add DOS stub to PE binaries

R=rsc
CC=golang-dev
https://golang.org/cl/915041

diff --git a/src/cmd/ld/pe.c b/src/cmd/ld/pe.c
index 15bd7b70d617581509f3d96729b68d56410531ef..d3439abfb1860dfc7378df4d812b0c89778e3123 100644 (file)
--- a/src/cmd/ld/pe.c
+++ b/src/cmd/ld/pe.c
@@ -11,6 +11,28 @@
 #include "../ld/lib.h"
 #include "../ld/pe.h"
 
+// DOS stub that prints out
+// "This program cannot be run in DOS mode."
+static char dosstub[] =
+{
+       0x4d, 0x5a, 0x90, 0x00, 0x03, 0x00, 0x04, 0x00,
+       0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00,
+       0x8b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+       0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+       0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+       0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+       0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+       0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00,
+       0x0e, 0x1f, 0xba, 0x0e, 0x00, 0xb4, 0x09, 0xcd,
+       0x21, 0xb8, 0x01, 0x4c, 0xcd, 0x21, 0x54, 0x68,
+       0x69, 0x73, 0x20, 0x70, 0x72, 0x6f, 0x67, 0x72,
+       0x61, 0x6d, 0x20, 0x63, 0x61, 0x6e, 0x6e, 0x6f,
+       0x74, 0x20, 0x62, 0x65, 0x20, 0x72, 0x75, 0x6e,
+       0x20, 0x69, 0x6e, 0x20, 0x44, 0x4f, 0x53, 0x20,
+       0x6d, 0x6f, 0x64, 0x65, 0x2e, 0x0d, 0x0d, 0x0a,
+       0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
 static int pe64;
 static int nsect;
 static int sect_virt_begin;
@@ -64,8 +86,7 @@ pewrite(void)
 {
        int i, j;
 
-       strnput("MZ", 0x3c);
-       LPUT(0x40);     // file offset to PE header
+       write(cout, dosstub, sizeof dosstub);
        strnput("PE", 4);
 
        for (i=0; i<sizeof(fh); i++)