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* arm-tdep.c (struct arm_prologue_cache): Remove frameoffset.
(thumb_analyze_prologue): Move pv_area_store_would_trash call out of loop. Do not set cache->frameoffset. (arm_scan_prologue): Use prologue-value mechanism. Do not set frameoffset. Simplify framesize. (arm_make_prologue_cache, arm_normal_frame_base): Do not use frameoffset. * arm-tdep.h (enum gdb_regnum): Add ARM_IP_REGNUM.
This commit is contained in:
Daniel Jacobowitz
parent
b4b61fdbdf
commit
4be4395321
@ -1,3 +1,14 @@
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2007-10-10 Daniel Jacobowitz <dan@codesourcery.com>
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* arm-tdep.c (struct arm_prologue_cache): Remove frameoffset.
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(thumb_analyze_prologue): Move pv_area_store_would_trash call
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out of loop. Do not set cache->frameoffset.
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(arm_scan_prologue): Use prologue-value mechanism. Do not set
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frameoffset. Simplify framesize.
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(arm_make_prologue_cache, arm_normal_frame_base): Do not use
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frameoffset.
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* arm-tdep.h (enum gdb_regnum): Add ARM_IP_REGNUM.
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2007-10-10 Daniel Jacobowitz <dan@codesourcery.com>
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* target.c (update_current_target): Call setup_target_debug.
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113
gdb/arm-tdep.c
113
gdb/arm-tdep.c
@ -187,13 +187,11 @@ struct arm_prologue_cache
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to identify this frame. */
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CORE_ADDR prev_sp;
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/* The frame base for this frame is just prev_sp + frame offset -
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frame size. FRAMESIZE is the size of this stack frame, and
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FRAMEOFFSET if the initial offset from the stack pointer (this
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frame's stack pointer, not PREV_SP) to the frame base. */
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/* The frame base for this frame is just prev_sp - frame size.
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FRAMESIZE is the distance from the frame pointer to the
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initial stack pointer. */
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int framesize;
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int frameoffset;
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/* The register used to hold the frame pointer for this frame. */
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int framereg;
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@ -292,7 +290,9 @@ thumb_analyze_prologue (struct gdbarch *gdbarch,
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{
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int regno;
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int mask;
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int stop = 0;
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if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM]))
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break;
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/* Bits 0-7 contain a mask for registers R0-R7. Bit 8 says
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whether to save LR (R14). */
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@ -302,19 +302,10 @@ thumb_analyze_prologue (struct gdbarch *gdbarch,
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for (regno = ARM_LR_REGNUM; regno >= 0; regno--)
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if (mask & (1 << regno))
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{
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if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM]))
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{
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stop = 1;
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break;
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}
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regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM],
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-4);
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pv_area_store (stack, regs[ARM_SP_REGNUM], 4, regs[regno]);
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}
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if (stop)
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break;
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}
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else if ((insn & 0xff00) == 0xb000) /* add sp, #simm OR
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sub sp, #simm */
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@ -370,9 +361,6 @@ thumb_analyze_prologue (struct gdbarch *gdbarch,
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return start;
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}
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/* frameoffset is unused for this unwinder. */
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cache->frameoffset = 0;
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if (pv_is_register (regs[ARM_FP_REGNUM], ARM_SP_REGNUM))
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{
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/* Frame pointer is fp. Frame size is constant. */
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@ -652,14 +640,17 @@ arm_scan_prologue (struct frame_info *next_frame,
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struct arm_prologue_cache *cache)
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{
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struct gdbarch *gdbarch = get_frame_arch (next_frame);
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int regno, sp_offset, fp_offset, ip_offset;
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int regno;
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CORE_ADDR prologue_start, prologue_end, current_pc;
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CORE_ADDR prev_pc = frame_pc_unwind (next_frame);
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pv_t regs[ARM_FPS_REGNUM];
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struct pv_area *stack;
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struct cleanup *back_to;
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CORE_ADDR offset;
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/* Assume there is no frame until proven otherwise. */
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cache->framereg = ARM_SP_REGNUM;
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cache->framesize = 0;
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cache->frameoffset = 0;
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/* Check for Thumb prologue. */
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if (arm_pc_is_thumb (prev_pc))
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@ -754,7 +745,12 @@ arm_scan_prologue (struct frame_info *next_frame,
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in which case it is often (but not always) replaced by
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"str lr, [sp, #-4]!". - Michael Snyder, 2002-04-23] */
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sp_offset = fp_offset = ip_offset = 0;
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for (regno = 0; regno < ARM_FPS_REGNUM; regno++)
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regs[regno] = pv_register (regno, 0);
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stack = make_pv_area (ARM_SP_REGNUM);
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back_to = make_cleanup_free_pv_area (stack);
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regs[ARM_PC_REGNUM] = pv_unknown ();
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for (current_pc = prologue_start;
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current_pc < prologue_end;
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@ -764,7 +760,7 @@ arm_scan_prologue (struct frame_info *next_frame,
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if (insn == 0xe1a0c00d) /* mov ip, sp */
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{
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ip_offset = 0;
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regs[ARM_IP_REGNUM] = regs[ARM_SP_REGNUM];
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continue;
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}
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else if ((insn & 0xfffff000) == 0xe28dc000) /* add ip, sp #n */
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@ -772,7 +768,7 @@ arm_scan_prologue (struct frame_info *next_frame,
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unsigned imm = insn & 0xff; /* immediate value */
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unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */
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imm = (imm >> rot) | (imm << (32 - rot));
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ip_offset = imm;
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regs[ARM_IP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], imm);
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continue;
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}
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else if ((insn & 0xfffff000) == 0xe24dc000) /* sub ip, sp #n */
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@ -780,13 +776,15 @@ arm_scan_prologue (struct frame_info *next_frame,
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unsigned imm = insn & 0xff; /* immediate value */
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unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */
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imm = (imm >> rot) | (imm << (32 - rot));
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ip_offset = -imm;
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regs[ARM_IP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -imm);
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continue;
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}
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else if (insn == 0xe52de004) /* str lr, [sp, #-4]! */
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{
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sp_offset -= 4;
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cache->saved_regs[ARM_LR_REGNUM].addr = sp_offset;
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if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM]))
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break;
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regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -4);
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pv_area_store (stack, regs[ARM_SP_REGNUM], 4, regs[ARM_LR_REGNUM]);
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continue;
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}
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else if ((insn & 0xffff0000) == 0xe92d0000)
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@ -796,12 +794,15 @@ arm_scan_prologue (struct frame_info *next_frame,
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{
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int mask = insn & 0xffff;
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if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM]))
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break;
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/* Calculate offsets of saved registers. */
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for (regno = ARM_PC_REGNUM; regno >= 0; regno--)
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if (mask & (1 << regno))
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{
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sp_offset -= 4;
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cache->saved_regs[regno].addr = sp_offset;
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regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -4);
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pv_area_store (stack, regs[ARM_SP_REGNUM], 4, regs[regno]);
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}
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}
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else if ((insn & 0xffffc000) == 0xe54b0000 || /* strb rx,[r11,#-n] */
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@ -823,22 +824,24 @@ arm_scan_prologue (struct frame_info *next_frame,
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unsigned imm = insn & 0xff; /* immediate value */
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unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */
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imm = (imm >> rot) | (imm << (32 - rot));
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fp_offset = -imm + ip_offset;
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cache->framereg = ARM_FP_REGNUM;
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regs[ARM_FP_REGNUM] = pv_add_constant (regs[ARM_IP_REGNUM], -imm);
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}
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else if ((insn & 0xfffff000) == 0xe24dd000) /* sub sp, sp #n */
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{
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unsigned imm = insn & 0xff; /* immediate value */
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unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */
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imm = (imm >> rot) | (imm << (32 - rot));
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sp_offset -= imm;
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regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -imm);
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}
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else if ((insn & 0xffff7fff) == 0xed6d0103 /* stfe f?, [sp, -#c]! */
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&& gdbarch_tdep (gdbarch)->have_fpa_registers)
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{
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sp_offset -= 12;
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if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM]))
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break;
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regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -12);
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regno = ARM_F0_REGNUM + ((insn >> 12) & 0x07);
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cache->saved_regs[regno].addr = sp_offset;
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pv_area_store (stack, regs[ARM_SP_REGNUM], 12, regs[regno]);
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}
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else if ((insn & 0xffbf0fff) == 0xec2d0200 /* sfmfd f0, 4, [sp!] */
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&& gdbarch_tdep (gdbarch)->have_fpa_registers)
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@ -846,6 +849,9 @@ arm_scan_prologue (struct frame_info *next_frame,
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int n_saved_fp_regs;
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unsigned int fp_start_reg, fp_bound_reg;
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if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM]))
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break;
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if ((insn & 0x800) == 0x800) /* N0 is set */
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{
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if ((insn & 0x40000) == 0x40000) /* N1 is set */
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@ -865,8 +871,9 @@ arm_scan_prologue (struct frame_info *next_frame,
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fp_bound_reg = fp_start_reg + n_saved_fp_regs;
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for (; fp_start_reg < fp_bound_reg; fp_start_reg++)
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{
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sp_offset -= 12;
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cache->saved_regs[fp_start_reg++].addr = sp_offset;
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regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -12);
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pv_area_store (stack, regs[ARM_SP_REGNUM], 12,
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regs[fp_start_reg++]);
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}
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}
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else if ((insn & 0xf0000000) != 0xe0000000)
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@ -879,14 +886,32 @@ arm_scan_prologue (struct frame_info *next_frame,
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continue;
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}
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/* The frame size is just the negative of the offset (from the
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original SP) of the last thing thing we pushed on the stack.
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The frame offset is [new FP] - [new SP]. */
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cache->framesize = -sp_offset;
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if (cache->framereg == ARM_FP_REGNUM)
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cache->frameoffset = fp_offset - sp_offset;
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/* The frame size is just the distance from the frame register
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to the original stack pointer. */
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if (pv_is_register (regs[ARM_FP_REGNUM], ARM_SP_REGNUM))
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{
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/* Frame pointer is fp. */
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cache->framereg = ARM_FP_REGNUM;
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cache->framesize = -regs[ARM_FP_REGNUM].k;
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}
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else if (pv_is_register (regs[ARM_SP_REGNUM], ARM_SP_REGNUM))
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{
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/* Try the stack pointer... this is a bit desperate. */
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cache->framereg = ARM_SP_REGNUM;
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cache->framesize = -regs[ARM_SP_REGNUM].k;
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}
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else
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cache->frameoffset = 0;
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{
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/* We're just out of luck. We don't know where the frame is. */
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cache->framereg = -1;
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cache->framesize = 0;
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}
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for (regno = 0; regno < ARM_FPS_REGNUM; regno++)
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if (pv_area_find_reg (stack, gdbarch, regno, &offset))
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cache->saved_regs[regno].addr = offset;
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do_cleanups (back_to);
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}
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static struct arm_prologue_cache *
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@ -905,7 +930,7 @@ arm_make_prologue_cache (struct frame_info *next_frame)
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if (unwound_fp == 0)
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return cache;
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cache->prev_sp = unwound_fp + cache->framesize - cache->frameoffset;
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cache->prev_sp = unwound_fp + cache->framesize;
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/* Calculate actual addresses of saved registers using offsets
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determined by arm_scan_prologue. */
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@ -1057,7 +1082,7 @@ arm_normal_frame_base (struct frame_info *next_frame, void **this_cache)
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*this_cache = arm_make_prologue_cache (next_frame);
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cache = *this_cache;
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return cache->prev_sp + cache->frameoffset - cache->framesize;
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return cache->prev_sp - cache->framesize;
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}
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struct frame_base arm_normal_base = {
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@ -29,6 +29,7 @@ enum gdb_regnum {
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ARM_A1_REGNUM = 0, /* first integer-like argument */
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ARM_A4_REGNUM = 3, /* last integer-like argument */
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ARM_AP_REGNUM = 11,
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ARM_IP_REGNUM = 12,
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ARM_SP_REGNUM = 13, /* Contains address of top of stack */
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ARM_LR_REGNUM = 14, /* address to return to from a function call */
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ARM_PC_REGNUM = 15, /* Contains program counter */
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