+ struct sparc_frame_cache *cache;
+ CORE_ADDR addr, mcontext_addr, sp;
+ LONGEST fprs;
+ int regnum;
+
+ if (*this_cache)
+ return *this_cache;
+
+ cache = sparc_frame_cache (next_frame, this_cache);
+ gdb_assert (cache == *this_cache);
+
+ cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
+
+ /* The third argument is a pointer to an instance of `ucontext_t',
+ which has a member `uc_mcontext' that contains the saved
+ registers. */
+ addr = frame_unwind_register_unsigned (next_frame, SPARC_O2_REGNUM);
+ mcontext_addr = addr + 64;
+
+ /* The following registers travel in the `mc_local' slots of
+ `mcontext_t'. */
+ addr = mcontext_addr + 16 * 8;
+ cache->saved_regs[SPARC64_FPRS_REGNUM].addr = addr + 0 * 8;
+ cache->saved_regs[SPARC64_FSR_REGNUM].addr = addr + 1 * 8;
+
+ /* The following registers travel in the `mc_in' slots of
+ `mcontext_t'. */
+ addr = mcontext_addr + 24 * 8;
+ cache->saved_regs[SPARC64_NPC_REGNUM].addr = addr + 0 * 8;
+ cache->saved_regs[SPARC64_PC_REGNUM].addr = addr + 1 * 8;
+ cache->saved_regs[SPARC64_STATE_REGNUM].addr = addr + 2 * 8;
+ cache->saved_regs[SPARC64_Y_REGNUM].addr = addr + 4 * 8;
+
+ /* The `global' and `out' registers travel in the `mc_global' and
+ `mc_out' slots of `mcontext_t', except for %g0. Since %g0 is
+ always zero, keep the identity encoding. */
+ for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 8;
+ regnum <= SPARC_O7_REGNUM; regnum++, addr += 8)
+ cache->saved_regs[regnum].addr = addr;
+
+ /* The `local' and `in' registers have been saved in the register
+ save area. */
+ addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
+ sp = get_frame_memory_unsigned (next_frame, addr, 8);
+ for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS;
+ regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
+ cache->saved_regs[regnum].addr = addr;
+
+ /* The floating-point registers are only saved if the FEF bit in
+ %fprs has been set. */
+
+#define FPRS_FEF (1 << 2)
+
+ addr = cache->saved_regs[SPARC64_FPRS_REGNUM].addr;
+ fprs = get_frame_memory_unsigned (next_frame, addr, 8);
+ if (fprs & FPRS_FEF)