code review 10271047: cmd/5l,runtime: External linking support on linux-arm

src/pkg/runtime/os_linux_arm.c

 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 #include "runtime.h"
 #include "defs_GOOS_GOARCH.h"
 #include "os_GOOS.h"
+#include "../../cmd/ld/textflag.h"
 
 #define AT_NULL         0
 #define AT_PLATFORM     15 // introduced in at least 2.6.11
 #define AT_HWCAP        16 // introduced in at least 2.6.11
 #define AT_RANDOM       25 // introduced in 2.6.29
 #define HWCAP_VFP       (1 << 6) // introduced in at least 2.6.11
 #define HWCAP_VFPv3     (1 << 13) // introduced in 2.6.30
 static uint32 runtime·randomNumber;
 uint8  runtime·armArch = 6;     // we default to ARMv6
 uint32 runtime·hwcap;   // set by setup_auxv
 uint8  runtime·goarm;   // set by 5l
 
 void
 runtime·checkgoarm(void)
 {
         if(runtime·goarm > 5 && !(runtime·hwcap & HWCAP_VFP)) {
                 runtime·printf("runtime: this CPU has no floating point hardware, so it cannot run\n");
                 runtime·printf("this GOARM=%d binary. Recompile using GOARM=5.\n", runtime·goarm);
                 runtime·exit(1);
         }
         if(runtime·goarm > 6 && !(runtime·hwcap & HWCAP_VFPv3)) {
                 runtime·printf("runtime: this CPU has no VFPv3 floating point hardware, so it cannot run\n");
                 runtime·printf("this GOARM=%d binary. Recompile using GOARM=6.\n", runtime·goarm);
                 runtime·exit(1);
         }
 }
 
-#pragma textflag 7
+#pragma textflag NOSPLIT
 void
 runtime·setup_auxv(int32 argc, byte **argv)
 {
         byte **envp;
         byte *rnd;
         uint32 *auxv;
         uint32 t;
 
         // skip envp to get to ELF auxiliary vector.
         for(envp = &argv[argc+1]; *envp != nil; envp++)
@@ skipping 15 matching lines @@
                                         runtime·armArch = t - '0';
                         }
                         break;
                 case AT_HWCAP: // CPU capability bit flags
                         runtime·hwcap = auxv[1];
                         break;
                 }
         }
 }
 
-#pragma textflag 7
+#pragma textflag NOSPLIT
 int64
 runtime·cputicks(void)
 {
         // Currently cputicks() is used in blocking profiler and to seed runtime·fastrand1().
         // runtime·nanotime() is a poor approximation of CPU ticks that is enough for the profiler.
         // runtime·randomNumber provides better seeding of fastrand1.
         return runtime·nanotime() + runtime·randomNumber;
 }