Restore fastcontext support for big-endian PPC64

This commit restores support in fastcontext for the "function descriptor" of the 64-bit PowerPC ELF ABI, which is common to both AIX and Linux on big-endian PPC64. It appears to have been unintentionally removed along with AIX support in pull request #277 due to the (unfortunate) choice of `QTHREAD_PPC_ABI_AIX` to identify this ABI. Partially reverts 4f3031c Signed-off-by: Paul H. Hargrove <[email protected]>
sandialabs · Oct 17, 2024 · 8b48a1d · 8b48a1d
1 parent a4ac8ee
commit 8b48a1d
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/src/fastcontext/context.c b/src/fastcontext/context.c
@@ -27,7 +27,11 @@ void INTERNAL qt_makectxt(uctxt_t *ucp, void (*func)(void), int argc, ...) {
   tos = (unsigned long *)ucp->uc_stack.ss_sp +
         ucp->uc_stack.ss_size / sizeof(unsigned long);
   sp = tos - 16;
+#if defined __BIG_ENDIAN__ || defined _BIG_ENDIAN
+  ucp->mc.pc = *(long*)func;
+#else
   ucp->mc.pc = (long)func;
+#endif
   ucp->mc.sp = (long)sp;
   va_start(arg, argc);
   ucp->mc.r3 = va_arg(arg, long);