2011-11-25 Uros Bizjak <ubizjak@gmail.com>
* alpha-tdep.c (br_opcode): New. (ldl_l_opcode, ldq_l_opcode, stl_c_opcode, stq_c_opcode): Ditto. (alpha_deal_with_atomic_sequence): New function. (alpha_gdbarch_init): Handle single stepping of atomic sequences with alpha_deal_with_atomic_sequence.
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@ -1,3 +1,11 @@
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2011-11-25 Uros Bizjak <ubizjak@gmail.com>
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* alpha-tdep.c (br_opcode): New.
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(ldl_l_opcode, ldq_l_opcode, stl_c_opcode, stq_c_opcode): Ditto.
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(alpha_deal_with_atomic_sequence): New function.
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(alpha_gdbarch_init): Handle single stepping of atomic sequences
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with alpha_deal_with_atomic_sequence.
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2011-11-24 Tristan Gingold <gingold@adacore.com>
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* machoread.c (oso_el): Remove num_Sections, symbols, offsets
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@ -65,6 +65,7 @@ static const int stq_opcode = 0x2d;
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/* Branch instruction format */
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#define BR_RA(insn) MEM_RA(insn)
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static const int br_opcode = 0x30;
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static const int bne_opcode = 0x3d;
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/* Operate instruction format */
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@ -761,6 +762,94 @@ alpha_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
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return pc + offset;
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}
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static const int ldl_l_opcode = 0x2a;
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static const int ldq_l_opcode = 0x2b;
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static const int stl_c_opcode = 0x2e;
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static const int stq_c_opcode = 0x2f;
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/* Checks for an atomic sequence of instructions beginning with a LDL_L/LDQ_L
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instruction and ending with a STL_C/STQ_C instruction. If such a sequence
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is found, attempt to step through it. A breakpoint is placed at the end of
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the sequence. */
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int
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alpha_deal_with_atomic_sequence (struct frame_info *frame)
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{
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struct gdbarch *gdbarch = get_frame_arch (frame);
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struct address_space *aspace = get_frame_address_space (frame);
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CORE_ADDR pc = get_frame_pc (frame);
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CORE_ADDR breaks[2] = {-1, -1};
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CORE_ADDR loc = pc;
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CORE_ADDR closing_insn; /* Instruction that closes the atomic sequence. */
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unsigned int insn = alpha_read_insn (gdbarch, loc);
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int insn_count;
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int index;
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int last_breakpoint = 0; /* Defaults to 0 (no breakpoints placed). */
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const int atomic_sequence_length = 16; /* Instruction sequence length. */
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int bc_insn_count = 0; /* Conditional branch instruction count. */
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/* Assume all atomic sequences start with a LDL_L/LDQ_L instruction. */
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if (INSN_OPCODE (insn) != ldl_l_opcode
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&& INSN_OPCODE (insn) != ldq_l_opcode)
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return 0;
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/* Assume that no atomic sequence is longer than "atomic_sequence_length"
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instructions. */
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for (insn_count = 0; insn_count < atomic_sequence_length; ++insn_count)
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{
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loc += ALPHA_INSN_SIZE;
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insn = alpha_read_insn (gdbarch, loc);
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/* Assume that there is at most one branch in the atomic
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sequence. If a branch is found, put a breakpoint in
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its destination address. */
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if (INSN_OPCODE (insn) >= br_opcode)
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{
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int immediate = (insn & 0x001fffff) << 2;
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immediate = (immediate ^ 0x400000) - 0x400000;
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if (bc_insn_count >= 1)
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return 0; /* More than one branch found, fallback
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to the standard single-step code. */
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breaks[1] = loc + ALPHA_INSN_SIZE + immediate;
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bc_insn_count++;
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last_breakpoint++;
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}
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if (INSN_OPCODE (insn) == stl_c_opcode
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|| INSN_OPCODE (insn) == stq_c_opcode)
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break;
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}
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/* Assume that the atomic sequence ends with a STL_C/STQ_C instruction. */
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if (INSN_OPCODE (insn) != stl_c_opcode
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&& INSN_OPCODE (insn) != stq_c_opcode)
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return 0;
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closing_insn = loc;
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loc += ALPHA_INSN_SIZE;
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/* Insert a breakpoint right after the end of the atomic sequence. */
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breaks[0] = loc;
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/* Check for duplicated breakpoints. Check also for a breakpoint
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placed (branch instruction's destination) anywhere in sequence. */
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if (last_breakpoint
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&& (breaks[1] == breaks[0]
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|| (breaks[1] >= pc && breaks[1] <= closing_insn)))
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last_breakpoint = 0;
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/* Effectively inserts the breakpoints. */
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for (index = 0; index <= last_breakpoint; index++)
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insert_single_step_breakpoint (gdbarch, aspace, breaks[index]);
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return 1;
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}
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/* Figure out where the longjmp will land.
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We expect the first arg to be a pointer to the jmp_buf structure from
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@ -1749,6 +1838,9 @@ alpha_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
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set_gdbarch_decr_pc_after_break (gdbarch, ALPHA_INSN_SIZE);
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set_gdbarch_cannot_step_breakpoint (gdbarch, 1);
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/* Handles single stepping of atomic sequences. */
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set_gdbarch_software_single_step (gdbarch, alpha_deal_with_atomic_sequence);
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/* Hook in ABI-specific overrides, if they have been registered. */
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gdbarch_init_osabi (info, gdbarch);
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