Bug 1532851 - Unbreak BSDs build on powerpc64 after bug 1462566. r=bb…

…ouvier a=lizzard

Define R32_sig, R01_sig based on:
https://github.com/openbsd/src/blob/master/sys/arch/powerpc/include/signal.h
https://github.com/netbsd/src/blob/trunk/sys/arch/powerpc/include/mcontext.h
https://github.com/freebsd/freebsd/blob/master/sys/powerpc/include/ucontext.h

--HG--
extra : source : 1f10307fec284c52fbaf8d8423b47e762b9f0990
extra : histedit_source : 57f09ced52ea26952b0571bf93d602327dec8dd3

js/src/wasm/WasmSignalHandlers.cpp

@@ -102,6 +102,11 @@ using mozilla::DebugOnly;
 #    define EPC_sig(p) ((p)->sc_pc)
 #    define RFP_sig(p) ((p)->sc_regs[30])
 #  endif
+#  if defined(__ppc64__) || defined(__PPC64__) || defined(__ppc64le__) || \
+      defined(__PPC64LE__)
+#    define R01_sig(p) ((p)->sc_frame.fixreg[1])
+#    define R32_sig(p) ((p)->sc_frame.srr0)
+#  endif
 #elif defined(__linux__) || defined(__sun)
 #  if defined(__linux__)
 #    define EIP_sig(p) ((p)->uc_mcontext.gregs[REG_EIP])
@@ -169,6 +174,11 @@ using mozilla::DebugOnly;
 #    define EPC_sig(p) ((p)->uc_mcontext.__gregs[_REG_EPC])
 #    define RFP_sig(p) ((p)->uc_mcontext.__gregs[_REG_S8])
 #  endif
+#  if defined(__ppc64__) || defined(__PPC64__) || defined(__ppc64le__) || \
+      defined(__PPC64LE__)
+#    define R01_sig(p) ((p)->uc_mcontext.__gregs[_REG_R1])
+#    define R32_sig(p) ((p)->uc_mcontext.__gregs[_REG_PC])
+#  endif
 #elif defined(__DragonFly__) || defined(__FreeBSD__) || \
     defined(__FreeBSD_kernel__)
 #  define EIP_sig(p) ((p)->uc_mcontext.mc_eip)
@@ -198,6 +208,11 @@ using mozilla::DebugOnly;
 #    define EPC_sig(p) ((p)->uc_mcontext.mc_pc)
 #    define RFP_sig(p) ((p)->uc_mcontext.mc_regs[30])
 #  endif
+#  if defined(__FreeBSD__) && (defined(__ppc64__) || defined(__PPC64__) || \
+                               defined(__ppc64le__) || defined(__PPC64LE__))
+#    define R01_sig(p) ((p)->uc_mcontext.mc_gpr[1])
+#    define R32_sig(p) ((p)->uc_mcontext.mc_srr0)
+#  endif
 #elif defined(XP_DARWIN)
 #  define EIP_sig(p) ((p)->thread.uts.ts32.__eip)
 #  define EBP_sig(p) ((p)->thread.uts.ts32.__ebp)