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runtime: arm: abort if VFPv3 support missing

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Fixes #3456.

This proposal is a reformulation of CL 5987063. This CL resets
the default GOARM value to 6 and allows the use of the VFPv3
optimisation if GOARM=7. Binaries built with this CL in place
will abort if GOARM=7 was used and the target host does not
support VFPv3.

R=minux.ma, rsc, ajstarks
CC=golang-dev
https://golang.org/cl/6501099
This commit is contained in:
Dave Cheney 2012-09-18 09:55:07 +10:00
parent 5e1864fbe5
commit 55ca5ab0be
4 changed files with 16 additions and 3 deletions
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7
src/cmd/5l/asm.c
View File

@ -2213,7 +2213,8 @@ omvl(Prog *p, Adr *a, int dr)
int
chipzero(Ieee *e)
{
if(e->l != 0 || e->h != 0)
// We use GOARM=7 to gate the use of VFPv3 vmov (imm) instructions.
if(goarm < 7 || e->l != 0 || e->h != 0)
return -1;
return 0;
}
@ -2224,6 +2225,10 @@ chipfloat(Ieee *e)
int n;
ulong h;
// We use GOARM=7 to gate the use of VFPv3 vmov (imm) instructions.
if(goarm < 7)
goto no;
if(e->l != 0 || (e->h&0xffff) != 0)
goto no;
h = e->h & 0x7fc00000;

2
src/cmd/5l/l.h
View File

@ -316,6 +316,8 @@ void addpool(Prog*, Adr*);
EXTERN Prog* blitrl;
EXTERN Prog* elitrl;
EXTERN int goarm;
void initdiv(void);
EXTERN Prog* prog_div;
EXTERN Prog* prog_divu;

2
src/cmd/5l/obj.c
View File

@ -93,7 +93,7 @@ main(int argc, char *argv[])
if(p != nil)
goarm = atoi(p);
else
goarm = 7;
goarm = 6;
if(goarm == 5)
debug['F'] = 1;

8
src/pkg/runtime/signal_linux_arm.c
View File

@ -147,7 +147,8 @@ runtime·setsig(int32 i, void (*fn)(int32, Siginfo*, void*, G*), bool restart)
#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)
#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
@ -161,6 +162,11 @@ runtime·checkgoarm(void)
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