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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [libgloss/] [sparc/] [fixctors.c] - Rev 218
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/* Code to byte-swap static constructor/destructor tables on broken a.out little-endian targets. The startup code should call __fix_ctors just before calling main. It is safe to use on non-broken or big-endian targets. */ extern long __CTOR_LIST__[]; extern long __DTOR_LIST__[]; static void byte_swap (long *entry) { unsigned char *p = (unsigned char *)entry; unsigned char tmp; tmp = p[0]; p[0] = p[3]; p[3] = tmp; tmp = p[1]; p[1] = p[2]; p[2] = tmp; } static void fix_table (long *table) { long len = table[0]; /* The heuristic for deciding if a table is broken is to examine the word at the start of the table, which contains the number of function pointers immediately following. If the low word is zero, and the high word is non-zero, it's very likely that it is byte-swapped. This test will fail if the program has an exact multiple of 64K static constructors or destructors, a very unlikely situation. */ if ((len & 0xffff) == 0 && (len & 0xffff0000) != 0) { /* The table looks broken. Byte-swap all the words in the table, up to a NULL entry, which marks the end of the table. */ do { byte_swap (table); table++; } while (*table); } } void __fix_ctors (void) { fix_table (__CTOR_LIST__); fix_table (__DTOR_LIST__); }
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