983 |
983 |
984 // Looks like all platforms except IA64 can use the same function to check |
984 // Looks like all platforms except IA64 can use the same function to check |
985 // if C stack is walkable beyond current frame. The check for fp() is not |
985 // if C stack is walkable beyond current frame. The check for fp() is not |
986 // necessary on Sparc, but it's harmless. |
986 // necessary on Sparc, but it's harmless. |
987 bool os::is_first_C_frame(frame* fr) { |
987 bool os::is_first_C_frame(frame* fr) { |
988 #ifdef IA64 |
988 #if defined(IA64) && !defined(_WIN32) |
989 // In order to walk native frames on Itanium, we need to access the unwind |
989 // On IA64 we have to check if the callers bsp is still valid |
990 // table, which is inside ELF. We don't want to parse ELF after fatal error, |
990 // (i.e. within the register stack bounds). |
991 // so return true for IA64. If we need to support C stack walking on IA64, |
991 // Notice: this only works for threads created by the VM and only if |
992 // this function needs to be moved to CPU specific files, as fp() on IA64 |
992 // we walk the current stack!!! If we want to be able to walk |
993 // is register stack, which grows towards higher memory address. |
993 // arbitrary other threads, we'll have to somehow store the thread |
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994 // object in the frame. |
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995 Thread *thread = Thread::current(); |
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996 if ((address)fr->fp() <= |
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997 thread->register_stack_base() HPUX_ONLY(+ 0x0) LINUX_ONLY(+ 0x50)) { |
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998 // This check is a little hacky, because on Linux the first C |
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999 // frame's ('start_thread') register stack frame starts at |
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1000 // "register_stack_base + 0x48" while on HPUX, the first C frame's |
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1001 // ('__pthread_bound_body') register stack frame seems to really |
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1002 // start at "register_stack_base". |
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1003 return true; |
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1004 } else { |
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1005 return false; |
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1006 } |
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1007 #elif defined(IA64) && defined(_WIN32) |
994 return true; |
1008 return true; |
995 #endif |
1009 #else |
996 |
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997 // Load up sp, fp, sender sp and sender fp, check for reasonable values. |
1010 // Load up sp, fp, sender sp and sender fp, check for reasonable values. |
998 // Check usp first, because if that's bad the other accessors may fault |
1011 // Check usp first, because if that's bad the other accessors may fault |
999 // on some architectures. Ditto ufp second, etc. |
1012 // on some architectures. Ditto ufp second, etc. |
1000 uintptr_t fp_align_mask = (uintptr_t)(sizeof(address)-1); |
1013 uintptr_t fp_align_mask = (uintptr_t)(sizeof(address)-1); |
1001 // sp on amd can be 32 bit aligned. |
1014 // sp on amd can be 32 bit aligned. |