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Line 495... |
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/*----------------------------------------------------------------------------*/
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/*----------------------------------------------------------------------------*/
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/*!Determine if we are executing a delay slot
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/*!Determine if we are executing a delay slot
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Looks at the instruction at the previous instruction to see if it was one
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Looks at the instruction at the previous instruction to see if it was one
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with a delay slot.
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with a delay slot. But it also has to be the address prior to NPC, because
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we may have just taken an exception.
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@param[in] gdbarch The GDB architecture being used
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@param[in] gdbarch The GDB architecture being used
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@param[in] this_frame Information about THIS frame
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@param[in] this_frame Information about THIS frame
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@return 1 (true) if this instruction is executing a delay slot, 0 (false)
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@return 1 (true) if this instruction is executing a delay slot, 0 (false)
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Line 512... |
struct frame_info *this_frame )
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struct frame_info *this_frame )
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{
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{
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struct regcache *regcache = get_current_regcache ();
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struct regcache *regcache = get_current_regcache ();
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ULONGEST val;
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ULONGEST val;
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CORE_ADDR ppc;
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CORE_ADDR ppc;
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CORE_ADDR npc;
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int index;
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int index;
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/* Get and decode the previous instruction. */
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/* Get and the previous and current instruction addresses. If they are not
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adjacent, we cannot be in a delay slot. */
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regcache_cooked_read_unsigned (regcache, OR1K_PPC_REGNUM, &val);
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regcache_cooked_read_unsigned (regcache, OR1K_PPC_REGNUM, &val);
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ppc = (CORE_ADDR)val;
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ppc = (CORE_ADDR)val;
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index = insn_decode (or1k_fetch_instruction (this_frame, ppc));
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regcache_cooked_read_unsigned (regcache, OR1K_NPC_REGNUM, &val);
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npc = (CORE_ADDR) val;
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if (0x4 != (npc - ppc))
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{
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return 0;
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}
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/* We are only executing a delay slot if the previous instruction was a
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/* Decode the previous instruction to see if it was a branch or a jump, and
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branch or jump. */
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hence we are in a delay slot. */
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index = insn_decode (or1k_fetch_instruction (this_frame, ppc));
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return or32_opcodes[index].flags & OR32_IF_DELAY;
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return or32_opcodes[index].flags & OR32_IF_DELAY;
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} /* or1k_single_step_through_delay() */
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} /* or1k_single_step_through_delay() */
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