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runtime: do not fall through in SIGBUS/SIGSEGV

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Faults beyond the first page are not expected
and should fail loudly.  They are not subject to recover.

R=r
CC=golang-dev
https://golang.org/cl/1915042
This commit is contained in:
Russ Cox 2010-07-30 11:32:55 -07:00
parent a0368180a7
commit 68b0a87966
3 changed files with 12 additions and 6 deletions
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6
src/pkg/runtime/darwin/thread.c
View File

@ -453,11 +453,13 @@ sigpanic(void)
case SIGBUS: case SIGBUS:
if(g->sigcode0 == BUS_ADRERR && g->sigcode1 < 0x1000) if(g->sigcode0 == BUS_ADRERR && g->sigcode1 < 0x1000)
panicstring("invalid memory address or nil pointer dereference"); panicstring("invalid memory address or nil pointer dereference");
break; printf("unexpected fault address %p\n", g->sigcode1);
throw("fault");
case SIGSEGV: case SIGSEGV:
if((g->sigcode0 == 0 || g->sigcode0 == SEGV_MAPERR) && g->sigcode1 < 0x1000) if((g->sigcode0 == 0 || g->sigcode0 == SEGV_MAPERR) && g->sigcode1 < 0x1000)
panicstring("invalid memory address or nil pointer dereference"); panicstring("invalid memory address or nil pointer dereference");
break; printf("unexpected fault address %p\n", g->sigcode1);
throw("fault");
case SIGFPE: case SIGFPE:
switch(g->sigcode0) { switch(g->sigcode0) {
case FPE_INTDIV: case FPE_INTDIV:

6
src/pkg/runtime/freebsd/thread.c
View File

@ -179,11 +179,13 @@ sigpanic(void)
case SIGBUS: case SIGBUS:
if(g->sigcode0 == BUS_ADRERR && g->sigcode1 < 0x1000) if(g->sigcode0 == BUS_ADRERR && g->sigcode1 < 0x1000)
panicstring("invalid memory address or nil pointer dereference"); panicstring("invalid memory address or nil pointer dereference");
break; printf("unexpected fault address %p\n", g->sigcode1);
throw("fault");
case SIGSEGV: case SIGSEGV:
if((g->sigcode0 == 0 || g->sigcode0 == SEGV_MAPERR) && g->sigcode1 < 0x1000) if((g->sigcode0 == 0 || g->sigcode0 == SEGV_MAPERR) && g->sigcode1 < 0x1000)
panicstring("invalid memory address or nil pointer dereference"); panicstring("invalid memory address or nil pointer dereference");
break; printf("unexpected fault address %p\n", g->sigcode1);
throw("fault");
case SIGFPE: case SIGFPE:
switch(g->sigcode0) { switch(g->sigcode0) {
case FPE_INTDIV: case FPE_INTDIV:

6
src/pkg/runtime/linux/thread.c
View File

@ -279,11 +279,13 @@ sigpanic(void)
case SIGBUS: case SIGBUS:
if(g->sigcode0 == BUS_ADRERR && g->sigcode1 < 0x1000) if(g->sigcode0 == BUS_ADRERR && g->sigcode1 < 0x1000)
panicstring("invalid memory address or nil pointer dereference"); panicstring("invalid memory address or nil pointer dereference");
break; printf("unexpected fault address %p\n", g->sigcode1);
throw("fault");
case SIGSEGV: case SIGSEGV:
if((g->sigcode0 == 0 || g->sigcode0 == SEGV_MAPERR) && g->sigcode1 < 0x1000) if((g->sigcode0 == 0 || g->sigcode0 == SEGV_MAPERR) && g->sigcode1 < 0x1000)
panicstring("invalid memory address or nil pointer dereference"); panicstring("invalid memory address or nil pointer dereference");
break; printf("unexpected fault address %p\n", g->sigcode1);
throw("fault");
case SIGFPE: case SIGFPE:
switch(g->sigcode0) { switch(g->sigcode0) {
case FPE_INTDIV: case FPE_INTDIV: