* frame.h: Move definition of struct frame_saved_args to before
struct frame to make it possible to use frame_saved_args in EXTRA_FRAME_INFO macro. * v850-tdep.c config/v850/tm-v850.h: Lotsa new functions and macros to make frame operations (such as backtrace) work.
This commit is contained in:
Stu Grossman
parent
693e9bf655
commit
e5a2ac8b3f
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@ -1,3 +1,14 @@
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Fri Oct 11 15:43:54 1996 Stu Grossman (grossman@critters.cygnus.com)
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* frame.h: Move definition of struct frame_saved_args to before
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struct frame to make it possible to use frame_saved_args in
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EXTRA_FRAME_INFO macro.
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start-sanitize-v850
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* v850-tdep.c config/v850/tm-v850.h: Lotsa new functions and
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macros to make frame operations (such as backtrace) work.
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end-sanitize-v850
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Fri Oct 11 14:23:50 1996 Fred Fish <fnf@cygnus.com>
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* dbxread.c (process_one_symbol): Check for null string directly
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@ -41,6 +41,8 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#define SP_REGNUM 3
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#define FP_REGNUM 2
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#define V0_REGNUM 10
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#define V1_REGNUM 11
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#define RP_REGNUM 31
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#define PC_REGNUM 64
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@ -58,26 +60,49 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#define DECR_PC_AFTER_BREAK 0
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#define POP_FRAME warning ("POP_FRAME not implemented yet!")
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#define INNER_THAN <
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#define FRAME_ARGS_SKIP 4
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#define SAVED_PC_AFTER_CALL(fi) read_register (RP_REGNUM)
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#define FRAME_CHAIN(fi) (read_memory_unsigned_integer ((fi)->frame - 8, 4))
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#ifdef __STDC__
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struct frame_info;
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struct frame_saved_regs;
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struct type;
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#endif
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#define FRAME_SAVED_PC(fi) (read_memory_unsigned_integer((fi)->frame - 4, 4))
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#define EXTRA_FRAME_INFO struct frame_saved_regs fsr;
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extern void v850_init_extra_frame_info PARAMS ((struct frame_info *fi));
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#define INIT_EXTRA_FRAME_INFO(fromleaf, fi) v850_init_extra_frame_info (fi)
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#define INIT_FRAME_PC /* Not necessary */
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#define SKIP_PROLOGUE(pc) pc+=8
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extern void v850_frame_find_saved_regs PARAMS ((struct frame_info *fi, struct frame_saved_regs *regaddr));
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#define FRAME_FIND_SAVED_REGS(fi, regaddr) regaddr = fi->fsr
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extern CORE_ADDR v850_frame_chain PARAMS ((struct frame_info *fi));
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#define FRAME_CHAIN(fi) v850_frame_chain (fi)
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extern CORE_ADDR v850_find_callers_reg PARAMS ((struct frame_info *fi, int regnum));
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#define FRAME_SAVED_PC(fi) (v850_find_callers_reg (fi, RP_REGNUM))
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#define EXTRACT_RETURN_VALUE(TYPE, REGBUF, VALBUF) \
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memcpy (VALBUF, REGBUF + REGISTER_BYTE (V0_REGNUM), TYPE_LENGTH (TYPE))
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#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
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(extract_address (REGBUF + REGISTER_BYTE (V0_REGNUM), \
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REGISTER_RAW_SIZE (V0_REGNUM)))
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#define STORE_RETURN_VALUE(TYPE, VALBUF) \
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write_register_bytes(REGISTER_BYTE (V0_REGNUM), VALBUF, TYPE_LENGTH (TYPE));
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extern CORE_ADDR v850_skip_prologue PARAMS ((CORE_ADDR pc));
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#define SKIP_PROLOGUE(pc) pc = v850_skip_prologue (pc)
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#define FRAME_ARGS_SKIP 0
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#define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
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#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
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#define FRAME_NUM_ARGS(val, fi) ((val) = -1)
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#define FRAME_FIND_SAVED_REGS(fi, regaddr) warning ("FRAME_FIND_SAVED_REGS not implemented yet!")
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#define EXTRACT_RETURN_VALUE(TYPE, REGBUF, VALBUF) warning ("EXTRACT_RETURN_VALUE not implemented yet!")
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#define STORE_RETURN_VALUE(TYPE, VALBUF) warning ("STORE_RETURN_VALUE not implemented yet!")
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extern struct frame_info *v850_pop_frame PARAMS ((struct frame_info *frame));
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#define POP_FRAME v850_pop_frame (get_current_frame ())
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216
gdb/v850-tdep.c
216
gdb/v850-tdep.c
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@ -30,6 +30,222 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "gdb_string.h"
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#include "gdbcore.h"
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/* This function actually figures out the frame address for a given pc and
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sp. This is tricky on the v850 because we only use an explicit frame
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pointer when using alloca(). The only reliable way to get this info is to
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examine the prologue.
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*/
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void
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v850_init_extra_frame_info (fi)
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struct frame_info *fi;
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{
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struct symtab_and_line sal;
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CORE_ADDR func_addr, prologue_end, current_pc;
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int reg;
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int frameoffset;
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int framereg;
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if (fi->next)
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fi->pc = v850_find_callers_reg (fi->next, RP_REGNUM);
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/* First, figure out the bounds of the prologue so that we can limit the
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search to something reasonable. */
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if (find_pc_partial_function (fi->pc, NULL, &func_addr, NULL))
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{
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sal = find_pc_line (func_addr, 0);
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prologue_end = sal.end;
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}
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else
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prologue_end = func_addr + 100; /* We're in the boondocks */
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prologue_end = min (prologue_end, fi->pc);
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/* Now, search the prologue looking for instructions that setup fp, save
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rp, adjust sp and such. */
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framereg = SP_REGNUM;
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frameoffset = 0;
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memset (fi->fsr.regs, '\000', sizeof fi->fsr.regs);
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for (current_pc = func_addr; current_pc < prologue_end; current_pc += 2)
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{
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int insn;
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insn = read_memory_integer (current_pc, 2);
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if ((insn & 0xffe0) == ((SP_REGNUM << 11) | 0x0240)) /* add <imm>,sp */
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frameoffset = (insn & 0x1f) | ~0x1f;
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else if (insn == ((SP_REGNUM << 11) | 0x0600 | SP_REGNUM)) /* addi <imm>,sp,sp */
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{
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current_pc += 2;
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frameoffset = read_memory_integer (current_pc, 2);
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}
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else if (insn == ((FP_REGNUM << 11) | 0x0000 | 12)) /* mov r12,r2 */
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framereg = FP_REGNUM; /* Setting up fp */
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else if ((insn & 0x07ff) == (0x0760 | SP_REGNUM)) /* st.w <reg>,<offset>[sp] */
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{
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reg = (insn >> 11) & 0x1f; /* Extract <reg> */
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current_pc += 2;
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insn = read_memory_integer (current_pc, 2) & ~1;
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fi->fsr.regs[reg] = insn + frameoffset;
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}
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else if ((insn & 0x07ff) == (0x0760 | FP_REGNUM)) /* st.w <reg>,<offset>[fp] */
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{
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reg = (insn >> 11) & 0x1f; /* Extract <reg> */
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current_pc += 2;
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insn = read_memory_integer (current_pc, 2) & ~1;
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fi->fsr.regs[reg] = insn;
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}
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}
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#if 0
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if (!fi->next)
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fi->frame = read_register (framereg);
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else
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if (framereg == SP_REGNUM)
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fi->frame = fi->next->frame;
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else
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fi->frame = v850_find_callers_reg (fi, framereg);
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if (framereg == SP_REGNUM)
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fi->frame -= frameoffset;
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#else
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if (!fi->next && framereg == SP_REGNUM)
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fi->frame = read_register (framereg) - frameoffset;
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#endif
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for (reg = 0; reg < NUM_REGS; reg++)
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if (fi->fsr.regs[reg] != 0)
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fi->fsr.regs[reg] += fi->frame;
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}
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/* Find the caller of this frame. We do this by seeing if RP_REGNUM is saved
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in the stack anywhere, otherwise we get it from the registers. */
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CORE_ADDR
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v850_find_callers_reg (fi, regnum)
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struct frame_info *fi;
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int regnum;
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{
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for (; fi; fi = fi->next)
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if (fi->fsr.regs[regnum] != 0)
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return read_memory_integer (fi->fsr.regs[regnum], 4);
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return read_register (regnum);
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}
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CORE_ADDR
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v850_frame_chain (fi)
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struct frame_info *fi;
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{
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CORE_ADDR callers_pc, callers_sp;
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struct frame_info temp_fi;
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CORE_ADDR func_addr, prologue_end, current_pc;
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int frameoffset;
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/* First, find out who called us */
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callers_pc = v850_find_callers_reg (fi, RP_REGNUM);
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/* Next, figure out where his prologue is. */
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if (find_pc_partial_function (callers_pc, NULL, &func_addr, NULL))
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{
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struct symtab_and_line sal;
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sal = find_pc_line (func_addr, 0);
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prologue_end = sal.end;
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}
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else
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prologue_end = func_addr + 100; /* We're in the boondocks */
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prologue_end = min (prologue_end, callers_pc);
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/* Now, figure out the frame location of the caller by examining his prologue.
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We're looking for either a load of the frame pointer register, or a stack
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adjustment. */
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frameoffset = 0;
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for (current_pc = func_addr; current_pc < prologue_end; current_pc += 2)
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{
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int insn;
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insn = read_memory_integer (current_pc, 2);
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if ((insn & 0xffe0) == ((SP_REGNUM << 11) | 0x0240)) /* add <imm>,sp */
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frameoffset = (insn & 0x1f) | ~0x1f;
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else if (insn == ((SP_REGNUM << 11) | 0x0600 | SP_REGNUM)) /* addi <imm>,sp,sp */
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{
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current_pc += 2;
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frameoffset = read_memory_integer (current_pc, 2);
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}
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else if (insn == ((FP_REGNUM << 11) | 0x0000 | 12)) /* mov r12,r2 */
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return v850_find_callers_reg (fi, FP_REGNUM); /* It's using a frame pointer reg */
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else if ((insn & 0x07ff) == (0x0760 | SP_REGNUM)) /* st.w <reg>,<offset>[sp] */
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current_pc += 2;
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else if ((insn & 0x07ff) == (0x0760 | FP_REGNUM)) /* st.w <reg>,<offset>[fp] */
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current_pc += 2;
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}
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return fi->frame - frameoffset;
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}
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CORE_ADDR
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v850_skip_prologue (pc)
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CORE_ADDR pc;
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{
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CORE_ADDR func_addr, func_end;
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/* See what the symbol table says */
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if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
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{
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struct symtab_and_line sal;
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sal = find_pc_line (func_addr, 0);
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if (sal.end < func_end)
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return sal.end;
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else
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/* The line after the prologue is after the end of the function. In
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this case, there probably isn't a prologue. */
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return pc;
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}
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/* We can't find the start of this function, so there's nothing we can do. */
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return pc;
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}
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struct frame_info *
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v850_pop_frame (frame)
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struct frame_info *frame;
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{
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int regnum;
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write_register (PC_REGNUM, FRAME_SAVED_PC (frame));
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for (regnum = 0; regnum < NUM_REGS; regnum++)
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if (frame->fsr.regs[regnum] != 0)
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write_register (regnum, read_memory_integer (frame->fsr.regs[regnum], 4));
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write_register (SP_REGNUM, FRAME_FP (frame));
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flush_cached_frames ();
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return NULL;
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}
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void
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_initialize_sparc_tdep ()
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