diff options
Diffstat (limited to 'gcc/ada/tracebak.c')
| -rw-r--r-- | gcc/ada/tracebak.c | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/gcc/ada/tracebak.c b/gcc/ada/tracebak.c index 2c8335d..01b9654 100644 --- a/gcc/ada/tracebak.c +++ b/gcc/ada/tracebak.c @@ -287,9 +287,10 @@ __gnat_backtrace (void **array, #error Unhandled darwin architecture. #endif -/*------------------------ PPC AIX/Older Darwin -------------------------*/ +/*---------------------- PPC AIX/PPC Lynx 178/Older Darwin ------------------*/ #elif ((defined (_POWER) && defined (_AIX)) || \ -(defined (__ppc__) && defined (__APPLE__))) + (defined (__powerpc__) && defined (__Lynx__) && !defined(__ELF__)) || \ + (defined (__ppc__) && defined (__APPLE__))) #define USE_GENERIC_UNWINDER @@ -307,9 +308,23 @@ struct layout should to feature a null backchain, AIX might expose a null return address instead. */ +/* Then LynxOS-178 features yet another variation, with return_address + == &__start, which we only add conditionally as this symbol is not + necessarily present elsewhere. Beware that &bla returns the + address of a descriptor when "bla" is a function. Getting the code + address requires an extra dereference. */ + +#if defined (__Lynx__) +extern void __start(); +#define EXTRA_STOP_CONDITION(CURRENT) ((CURRENT)->return_address == *(void**)&__start) +#else +#define EXTRA_STOP_CONDITION(CURRENT) (0) +#endif + #define STOP_FRAME(CURRENT, TOP_STACK) \ (((void *) (CURRENT) < (TOP_STACK)) \ - || (CURRENT)->return_address == NULL) + || (CURRENT)->return_address == NULL \ + || EXTRA_STOP_CONDITION(CURRENT)) /* The PPC ABI has an interesting specificity: the return address saved by a function is located in it's caller's frame, and the save operation only |