/* Target-dependent code for the NEC V850 for GDB, the GNU debugger.
- Copyright 1996, Free Software Foundation, Inc.
+ Copyright 1996, 2000, 2001 Free Software Foundation, Inc.
-This file is part of GDB.
+ This file is part of GDB.
-This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
-(at your option) any later version.
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "frame.h"
#include "bfd.h"
#include "gdb_string.h"
#include "gdbcore.h"
+#include "symfile.h"
+#include "arch-utils.h"
+#include "regcache.h"
-struct dummy_frame
+
+static char *v850_generic_reg_names[] = REGISTER_NAMES;
+
+static char *v850e_reg_names[] =
{
- struct dummy_frame *next;
+ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+ "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
+ "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
+ "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
+ "eipc", "eipsw", "fepc", "fepsw", "ecr", "psw", "sr6", "sr7",
+ "sr8", "sr9", "sr10", "sr11", "sr12", "sr13", "sr14", "sr15",
+ "ctpc", "ctpsw", "dbpc", "dbpsw", "ctbp", "sr21", "sr22", "sr23",
+ "sr24", "sr25", "sr26", "sr27", "sr28", "sr29", "sr30", "sr31",
+ "pc", "fp"
+};
- CORE_ADDR fp;
- CORE_ADDR sp;
- CORE_ADDR rp;
- CORE_ADDR pc;
+char **v850_register_names = v850_generic_reg_names;
+
+struct
+ {
+ char **regnames;
+ int mach;
+ }
+v850_processor_type_table[] =
+{
+ {
+ v850_generic_reg_names, bfd_mach_v850
+ }
+ ,
+ {
+ v850e_reg_names, bfd_mach_v850e
+ }
+ ,
+ {
+ v850e_reg_names, bfd_mach_v850ea
+ }
+ ,
+ {
+ NULL, 0
+ }
};
-static struct dummy_frame *dummy_frame_stack = NULL;
+/* Info gleaned from scanning a function's prologue. */
+
+struct pifsr /* Info about one saved reg */
+ {
+ int framereg; /* Frame reg (SP or FP) */
+ int offset; /* Offset from framereg */
+ int cur_frameoffset; /* Current frameoffset */
+ int reg; /* Saved register number */
+ };
+
+struct prologue_info
+ {
+ int framereg;
+ int frameoffset;
+ int start_function;
+ struct pifsr *pifsrs;
+ };
+
+static CORE_ADDR v850_scan_prologue (CORE_ADDR pc, struct prologue_info *fs);
+
+
+/* Should call_function allocate stack space for a struct return? */
+int
+v850_use_struct_convention (int gcc_p, struct type *type)
+{
+ return (TYPE_NFIELDS (type) > 1 || TYPE_LENGTH (type) > 4);
+}
\f
-/* This function actually figures out the frame address for a given pc and
- sp. This is tricky on the v850 because we only use an explicit frame
- pointer when using alloca(). The only reliable way to get this info is to
- examine the prologue.
-*/
-void
-v850_init_extra_frame_info (fi)
- struct frame_info *fi;
+
+/* Structure for mapping bits in register lists to register numbers. */
+struct reg_list
+{
+ long mask;
+ int regno;
+};
+
+/* Helper function for v850_scan_prologue to handle prepare instruction. */
+
+static void
+handle_prepare (int insn, int insn2, CORE_ADDR * current_pc_ptr,
+ struct prologue_info *pi, struct pifsr **pifsr_ptr)
+{
+ CORE_ADDR current_pc = *current_pc_ptr;
+ struct pifsr *pifsr = *pifsr_ptr;
+ long next = insn2 & 0xffff;
+ long list12 = ((insn & 1) << 16) + (next & 0xffe0);
+ long offset = (insn & 0x3e) << 1;
+ static struct reg_list reg_table[] =
+ {
+ {0x00800, 20}, /* r20 */
+ {0x00400, 21}, /* r21 */
+ {0x00200, 22}, /* r22 */
+ {0x00100, 23}, /* r23 */
+ {0x08000, 24}, /* r24 */
+ {0x04000, 25}, /* r25 */
+ {0x02000, 26}, /* r26 */
+ {0x01000, 27}, /* r27 */
+ {0x00080, 28}, /* r28 */
+ {0x00040, 29}, /* r29 */
+ {0x10000, 30}, /* ep */
+ {0x00020, 31}, /* lp */
+ {0, 0} /* end of table */
+ };
+ int i;
+
+ if ((next & 0x1f) == 0x0b) /* skip imm16 argument */
+ current_pc += 2;
+ else if ((next & 0x1f) == 0x13) /* skip imm16 argument */
+ current_pc += 2;
+ else if ((next & 0x1f) == 0x1b) /* skip imm32 argument */
+ current_pc += 4;
+
+ /* Calculate the total size of the saved registers, and add it
+ it to the immediate value used to adjust SP. */
+ for (i = 0; reg_table[i].mask != 0; i++)
+ if (list12 & reg_table[i].mask)
+ offset += REGISTER_RAW_SIZE (regtable[i].regno);
+ pi->frameoffset -= offset;
+
+ /* Calculate the offsets of the registers relative to the value
+ the SP will have after the registers have been pushed and the
+ imm5 value has been subtracted from it. */
+ if (pifsr)
+ {
+ for (i = 0; reg_table[i].mask != 0; i++)
+ {
+ if (list12 & reg_table[i].mask)
+ {
+ int reg = reg_table[i].regno;
+ offset -= REGISTER_RAW_SIZE (reg);
+ pifsr->reg = reg;
+ pifsr->offset = offset;
+ pifsr->cur_frameoffset = pi->frameoffset;
+#ifdef DEBUG
+ printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset);
+#endif
+ pifsr++;
+ }
+ }
+ }
+#ifdef DEBUG
+ printf_filtered ("\tfound ctret after regsave func");
+#endif
+
+ /* Set result parameters. */
+ *current_pc_ptr = current_pc;
+ *pifsr_ptr = pifsr;
+}
+
+
+/* Helper function for v850_scan_prologue to handle pushm/pushl instructions.
+ FIXME: the SR bit of the register list is not supported; must check
+ that the compiler does not ever generate this bit. */
+
+static void
+handle_pushm (int insn, int insn2, struct prologue_info *pi,
+ struct pifsr **pifsr_ptr)
+{
+ struct pifsr *pifsr = *pifsr_ptr;
+ long list12 = ((insn & 0x0f) << 16) + (insn2 & 0xfff0);
+ long offset = 0;
+ static struct reg_list pushml_reg_table[] =
+ {
+ {0x80000, PS_REGNUM}, /* PSW */
+ {0x40000, 1}, /* r1 */
+ {0x20000, 2}, /* r2 */
+ {0x10000, 3}, /* r3 */
+ {0x00800, 4}, /* r4 */
+ {0x00400, 5}, /* r5 */
+ {0x00200, 6}, /* r6 */
+ {0x00100, 7}, /* r7 */
+ {0x08000, 8}, /* r8 */
+ {0x04000, 9}, /* r9 */
+ {0x02000, 10}, /* r10 */
+ {0x01000, 11}, /* r11 */
+ {0x00080, 12}, /* r12 */
+ {0x00040, 13}, /* r13 */
+ {0x00020, 14}, /* r14 */
+ {0x00010, 15}, /* r15 */
+ {0, 0} /* end of table */
+ };
+ static struct reg_list pushmh_reg_table[] =
+ {
+ {0x80000, 16}, /* r16 */
+ {0x40000, 17}, /* r17 */
+ {0x20000, 18}, /* r18 */
+ {0x10000, 19}, /* r19 */
+ {0x00800, 20}, /* r20 */
+ {0x00400, 21}, /* r21 */
+ {0x00200, 22}, /* r22 */
+ {0x00100, 23}, /* r23 */
+ {0x08000, 24}, /* r24 */
+ {0x04000, 25}, /* r25 */
+ {0x02000, 26}, /* r26 */
+ {0x01000, 27}, /* r27 */
+ {0x00080, 28}, /* r28 */
+ {0x00040, 29}, /* r29 */
+ {0x00010, 30}, /* r30 */
+ {0x00020, 31}, /* r31 */
+ {0, 0} /* end of table */
+ };
+ struct reg_list *reg_table;
+ int i;
+
+ /* Is this a pushml or a pushmh? */
+ if ((insn2 & 7) == 1)
+ reg_table = pushml_reg_table;
+ else
+ reg_table = pushmh_reg_table;
+
+ /* Calculate the total size of the saved registers, and add it
+ it to the immediate value used to adjust SP. */
+ for (i = 0; reg_table[i].mask != 0; i++)
+ if (list12 & reg_table[i].mask)
+ offset += REGISTER_RAW_SIZE (regtable[i].regno);
+ pi->frameoffset -= offset;
+
+ /* Calculate the offsets of the registers relative to the value
+ the SP will have after the registers have been pushed and the
+ imm5 value is subtracted from it. */
+ if (pifsr)
+ {
+ for (i = 0; reg_table[i].mask != 0; i++)
+ {
+ if (list12 & reg_table[i].mask)
+ {
+ int reg = reg_table[i].regno;
+ offset -= REGISTER_RAW_SIZE (reg);
+ pifsr->reg = reg;
+ pifsr->offset = offset;
+ pifsr->cur_frameoffset = pi->frameoffset;
+#ifdef DEBUG
+ printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset);
+#endif
+ pifsr++;
+ }
+ }
+ }
+#ifdef DEBUG
+ printf_filtered ("\tfound ctret after regsave func");
+#endif
+
+ /* Set result parameters. */
+ *pifsr_ptr = pifsr;
+}
+\f
+
+
+
+/* Function: scan_prologue
+ Scan the prologue of the function that contains PC, and record what
+ we find in PI. PI->fsr must be zeroed by the called. Returns the
+ pc after the prologue. Note that the addresses saved in pi->fsr
+ are actually just frame relative (negative offsets from the frame
+ pointer). This is because we don't know the actual value of the
+ frame pointer yet. In some circumstances, the frame pointer can't
+ be determined till after we have scanned the prologue. */
+
+static CORE_ADDR
+v850_scan_prologue (CORE_ADDR pc, struct prologue_info *pi)
{
- struct symtab_and_line sal;
CORE_ADDR func_addr, prologue_end, current_pc;
+ struct pifsr *pifsr, *pifsr_tmp;
+ int fp_used;
+ int ep_used;
int reg;
- int frameoffset;
- int framereg;
-
- if (fi->next)
- fi->pc = FRAME_SAVED_PC (fi->next);
+ CORE_ADDR save_pc, save_end;
+ int regsave_func_p;
+ int r12_tmp;
/* First, figure out the bounds of the prologue so that we can limit the
search to something reasonable. */
- if (find_pc_partial_function (fi->pc, NULL, &func_addr, NULL))
+ if (find_pc_partial_function (pc, NULL, &func_addr, NULL))
{
+ struct symtab_and_line sal;
+
sal = find_pc_line (func_addr, 0);
+ if (func_addr == entry_point_address ())
+ pi->start_function = 1;
+ else
+ pi->start_function = 0;
+
+#if 0
if (sal.line == 0)
- prologue_end = fi->pc;
+ prologue_end = pc;
else
prologue_end = sal.end;
+#else
+ prologue_end = pc;
+#endif
}
else
- prologue_end = func_addr + 100; /* We're in the boondocks */
+ { /* We're in the boondocks */
+ func_addr = pc - 100;
+ prologue_end = pc;
+ }
- prologue_end = min (prologue_end, fi->pc);
+ prologue_end = min (prologue_end, pc);
/* Now, search the prologue looking for instructions that setup fp, save
- rp, adjust sp and such. */
-
- framereg = SP_REGNUM;
- frameoffset = 0;
- memset (fi->fsr.regs, '\000', sizeof fi->fsr.regs);
-
- for (current_pc = func_addr; current_pc < prologue_end; current_pc += 2)
+ rp, adjust sp and such. We also record the frame offset of any saved
+ registers. */
+
+ pi->frameoffset = 0;
+ pi->framereg = SP_REGNUM;
+ fp_used = 0;
+ ep_used = 0;
+ pifsr = pi->pifsrs;
+ regsave_func_p = 0;
+ save_pc = 0;
+ save_end = 0;
+ r12_tmp = 0;
+
+#ifdef DEBUG
+ printf_filtered ("Current_pc = 0x%.8lx, prologue_end = 0x%.8lx\n",
+ (long) func_addr, (long) prologue_end);
+#endif
+
+ for (current_pc = func_addr; current_pc < prologue_end;)
{
- int insn;
+ int insn, insn2;
- insn = read_memory_integer (current_pc, 2);
+#ifdef DEBUG
+ printf_filtered ("0x%.8lx ", (long) current_pc);
+ (*tm_print_insn) (current_pc, &tm_print_insn_info);
+#endif
- if ((insn & 0xffe0) == ((SP_REGNUM << 11) | 0x0240)) /* add <imm>,sp */
- frameoffset = (insn & 0x1f) | ~0x1f;
- else if (insn == ((SP_REGNUM << 11) | 0x0600 | SP_REGNUM)) /* addi <imm>,sp,sp */
+ insn = read_memory_unsigned_integer (current_pc, 2);
+ current_pc += 2;
+ if ((insn & 0x0780) >= 0x0600) /* Four byte instruction? */
{
+ insn2 = read_memory_unsigned_integer (current_pc, 2);
current_pc += 2;
+ }
- frameoffset = read_memory_integer (current_pc, 2);
+ if ((insn & 0xffc0) == ((10 << 11) | 0x0780) && !regsave_func_p)
+ { /* jarl <func>,10 */
+ long low_disp = insn2 & ~(long) 1;
+ long disp = (((((insn & 0x3f) << 16) + low_disp)
+ & ~(long) 1) ^ 0x00200000) - 0x00200000;
+
+ save_pc = current_pc;
+ save_end = prologue_end;
+ regsave_func_p = 1;
+ current_pc += disp - 4;
+ prologue_end = (current_pc
+ + (2 * 3) /* moves to/from ep */
+ + 4 /* addi <const>,sp,sp */
+ + 2 /* jmp [r10] */
+ + (2 * 12) /* sst.w to save r2, r20-r29, r31 */
+ + 20); /* slop area */
+
+#ifdef DEBUG
+ printf_filtered ("\tfound jarl <func>,r10, disp = %ld, low_disp = %ld, new pc = 0x%.8lx\n",
+ disp, low_disp, (long) current_pc + 2);
+#endif
+ continue;
+ }
+ else if ((insn & 0xffc0) == 0x0200 && !regsave_func_p)
+ { /* callt <imm6> */
+ long ctbp = read_register (CTBP_REGNUM);
+ long adr = ctbp + ((insn & 0x3f) << 1);
+
+ save_pc = current_pc;
+ save_end = prologue_end;
+ regsave_func_p = 1;
+ current_pc = ctbp + (read_memory_unsigned_integer (adr, 2) & 0xffff);
+ prologue_end = (current_pc
+ + (2 * 3) /* prepare list2,imm5,sp/imm */
+ + 4 /* ctret */
+ + 20); /* slop area */
+
+#ifdef DEBUG
+ printf_filtered ("\tfound callt, ctbp = 0x%.8lx, adr = %.8lx, new pc = 0x%.8lx\n",
+ ctbp, adr, (long) current_pc);
+#endif
+ continue;
}
- else if (insn == ((FP_REGNUM << 11) | 0x0000 | 12)) /* mov r12,r2 */
- framereg = FP_REGNUM; /* Setting up fp */
- else if ((insn & 0x07ff) == (0x0760 | SP_REGNUM)) /* st.w <reg>,<offset>[sp] */
+ else if ((insn & 0xffc0) == 0x0780) /* prepare list2,imm5 */
{
- reg = (insn >> 11) & 0x1f; /* Extract <reg> */
- current_pc += 2;
+ handle_prepare (insn, insn2, ¤t_pc, pi, &pifsr);
+ continue;
+ }
+ else if (insn == 0x07e0 && regsave_func_p && insn2 == 0x0144)
+ { /* ctret after processing register save function */
+ current_pc = save_pc;
+ prologue_end = save_end;
+ regsave_func_p = 0;
+#ifdef DEBUG
+ printf_filtered ("\tfound ctret after regsave func");
+#endif
+ continue;
+ }
+ else if ((insn & 0xfff0) == 0x07e0 && (insn2 & 5) == 1)
+ { /* pushml, pushmh */
+ handle_pushm (insn, insn2, pi, &pifsr);
+ continue;
+ }
+ else if ((insn & 0xffe0) == 0x0060 && regsave_func_p)
+ { /* jmp after processing register save function */
+ current_pc = save_pc;
+ prologue_end = save_end;
+ regsave_func_p = 0;
+#ifdef DEBUG
+ printf_filtered ("\tfound jmp after regsave func");
+#endif
+ continue;
+ }
+ else if ((insn & 0x07c0) == 0x0780 /* jarl or jr */
+ || (insn & 0xffe0) == 0x0060 /* jmp */
+ || (insn & 0x0780) == 0x0580) /* branch */
+ {
+#ifdef DEBUG
+ printf_filtered ("\n");
+#endif
+ break; /* Ran into end of prologue */
+ }
- insn = read_memory_integer (current_pc, 2) & ~1;
+ else if ((insn & 0xffe0) == ((SP_REGNUM << 11) | 0x0240)) /* add <imm>,sp */
+ pi->frameoffset += ((insn & 0x1f) ^ 0x10) - 0x10;
+ else if (insn == ((SP_REGNUM << 11) | 0x0600 | SP_REGNUM)) /* addi <imm>,sp,sp */
+ pi->frameoffset += insn2;
+ else if (insn == ((FP_RAW_REGNUM << 11) | 0x0000 | SP_REGNUM)) /* mov sp,fp */
+ {
+ fp_used = 1;
+ pi->framereg = FP_RAW_REGNUM;
+ }
- fi->fsr.regs[reg] = insn + frameoffset;
+ else if (insn == ((R12_REGNUM << 11) | 0x0640 | R0_REGNUM)) /* movhi hi(const),r0,r12 */
+ r12_tmp = insn2 << 16;
+ else if (insn == ((R12_REGNUM << 11) | 0x0620 | R12_REGNUM)) /* movea lo(const),r12,r12 */
+ r12_tmp += insn2;
+ else if (insn == ((SP_REGNUM << 11) | 0x01c0 | R12_REGNUM) && r12_tmp) /* add r12,sp */
+ pi->frameoffset = r12_tmp;
+ else if (insn == ((EP_REGNUM << 11) | 0x0000 | SP_REGNUM)) /* mov sp,ep */
+ ep_used = 1;
+ else if (insn == ((EP_REGNUM << 11) | 0x0000 | R1_REGNUM)) /* mov r1,ep */
+ ep_used = 0;
+ else if (((insn & 0x07ff) == (0x0760 | SP_REGNUM) /* st.w <reg>,<offset>[sp] */
+ || (fp_used
+ && (insn & 0x07ff) == (0x0760 | FP_RAW_REGNUM))) /* st.w <reg>,<offset>[fp] */
+ && pifsr
+ && (((reg = (insn >> 11) & 0x1f) >= SAVE1_START_REGNUM && reg <= SAVE1_END_REGNUM)
+ || (reg >= SAVE2_START_REGNUM && reg <= SAVE2_END_REGNUM)
+ || (reg >= SAVE3_START_REGNUM && reg <= SAVE3_END_REGNUM)))
+ {
+ pifsr->reg = reg;
+ pifsr->offset = insn2 & ~1;
+ pifsr->cur_frameoffset = pi->frameoffset;
+#ifdef DEBUG
+ printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset);
+#endif
+ pifsr++;
}
- else if ((insn & 0x07ff) == (0x0760 | FP_REGNUM)) /* st.w <reg>,<offset>[fp] */
+
+ else if (ep_used /* sst.w <reg>,<offset>[ep] */
+ && ((insn & 0x0781) == 0x0501)
+ && pifsr
+ && (((reg = (insn >> 11) & 0x1f) >= SAVE1_START_REGNUM && reg <= SAVE1_END_REGNUM)
+ || (reg >= SAVE2_START_REGNUM && reg <= SAVE2_END_REGNUM)
+ || (reg >= SAVE3_START_REGNUM && reg <= SAVE3_END_REGNUM)))
{
- reg = (insn >> 11) & 0x1f; /* Extract <reg> */
- current_pc += 2;
+ pifsr->reg = reg;
+ pifsr->offset = (insn & 0x007e) << 1;
+ pifsr->cur_frameoffset = pi->frameoffset;
+#ifdef DEBUG
+ printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset);
+#endif
+ pifsr++;
+ }
- insn = read_memory_integer (current_pc, 2) & ~1;
+#ifdef DEBUG
+ printf_filtered ("\n");
+#endif
+ }
- fi->fsr.regs[reg] = insn;
- }
+ if (pifsr)
+ pifsr->framereg = 0; /* Tie off last entry */
+
+ /* Fix up any offsets to the final offset. If a frame pointer was created, use it
+ instead of the stack pointer. */
+ for (pifsr_tmp = pi->pifsrs; pifsr_tmp && pifsr_tmp != pifsr; pifsr_tmp++)
+ {
+ pifsr_tmp->offset -= pi->frameoffset - pifsr_tmp->cur_frameoffset;
+ pifsr_tmp->framereg = pi->framereg;
+
+#ifdef DEBUG
+ printf_filtered ("Saved register r%d, offset = %d, framereg = r%d\n",
+ pifsr_tmp->reg, pifsr_tmp->offset, pifsr_tmp->framereg);
+#endif
}
- if (PC_IN_CALL_DUMMY (fi->pc, NULL, NULL))
- fi->frame = dummy_frame_stack->sp;
- else if (!fi->next && framereg == SP_REGNUM)
- fi->frame = read_register (framereg) - frameoffset;
+#ifdef DEBUG
+ printf_filtered ("Framereg = r%d, frameoffset = %d\n", pi->framereg, pi->frameoffset);
+#endif
- for (reg = 0; reg < NUM_REGS; reg++)
- if (fi->fsr.regs[reg] != 0)
- fi->fsr.regs[reg] += fi->frame;
+ return current_pc;
}
-/* Find the caller of this frame. We do this by seeing if RP_REGNUM is saved
- in the stack anywhere, otherwise we get it from the registers. */
+/* Function: init_extra_frame_info
+ Setup the frame's frame pointer, pc, and frame addresses for saved
+ registers. Most of the work is done in scan_prologue().
-CORE_ADDR
-v850_find_callers_reg (fi, regnum)
- struct frame_info *fi;
- int regnum;
-{
- /* XXX - Won't work if multiple dummy frames are active */
- if (PC_IN_CALL_DUMMY (fi->pc, NULL, NULL))
- switch (regnum)
- {
- case SP_REGNUM:
- return dummy_frame_stack->sp;
- break;
- case FP_REGNUM:
- return dummy_frame_stack->fp;
- break;
- case RP_REGNUM:
- return dummy_frame_stack->pc;
- break;
- case PC_REGNUM:
- return dummy_frame_stack->pc;
- break;
- }
+ Note that when we are called for the last frame (currently active frame),
+ that fi->pc and fi->frame will already be setup. However, fi->frame will
+ be valid only if this routine uses FP. For previous frames, fi-frame will
+ always be correct (since that is derived from v850_frame_chain ()).
- for (; fi; fi = fi->next)
- if (fi->fsr.regs[regnum] != 0)
- return read_memory_integer (fi->fsr.regs[regnum], 4);
-
- return read_register (regnum);
-}
+ We can be called with the PC in the call dummy under two circumstances.
+ First, during normal backtracing, second, while figuring out the frame
+ pointer just prior to calling the target function (see run_stack_dummy). */
-CORE_ADDR
-v850_frame_chain (fi)
- struct frame_info *fi;
+void
+v850_init_extra_frame_info (struct frame_info *fi)
{
- CORE_ADDR callers_pc, callers_sp;
- CORE_ADDR func_addr, prologue_end, current_pc;
- int frameoffset;
+ struct prologue_info pi;
+ struct pifsr pifsrs[NUM_REGS + 1], *pifsr;
- /* First, find out who called us */
+ if (fi->next)
+ fi->pc = FRAME_SAVED_PC (fi->next);
- callers_pc = FRAME_SAVED_PC (fi);
+ memset (fi->fsr.regs, '\000', sizeof fi->fsr.regs);
- if (PC_IN_CALL_DUMMY (callers_pc, NULL, NULL))
- return dummy_frame_stack->sp; /* XXX Won't work if multiple dummy frames on stack! */
+ /* The call dummy doesn't save any registers on the stack, so we can return
+ now. */
+ if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+ return;
- /* Next, figure out where his prologue is. */
+ pi.pifsrs = pifsrs;
- if (find_pc_partial_function (callers_pc, NULL, &func_addr, NULL))
- {
- struct symtab_and_line sal;
+ v850_scan_prologue (fi->pc, &pi);
- /* Stop when the caller is the entry point function */
- if (func_addr == entry_point_address ())
- return 0;
+ if (!fi->next && pi.framereg == SP_REGNUM)
+ fi->frame = read_register (pi.framereg) - pi.frameoffset;
- sal = find_pc_line (func_addr, 0);
+ for (pifsr = pifsrs; pifsr->framereg; pifsr++)
+ {
+ fi->fsr.regs[pifsr->reg] = pifsr->offset + fi->frame;
- if (sal.line == 0)
- prologue_end = callers_pc;
- else
- prologue_end = sal.end;
+ if (pifsr->framereg == SP_REGNUM)
+ fi->fsr.regs[pifsr->reg] += pi.frameoffset;
}
- else
- prologue_end = func_addr + 100; /* We're in the boondocks */
+}
- prologue_end = min (prologue_end, callers_pc);
+/* Function: frame_chain
+ Figure out the frame prior to FI. Unfortunately, this involves
+ scanning the prologue of the caller, which will also be done
+ shortly by v850_init_extra_frame_info. For the dummy frame, we
+ just return the stack pointer that was in use at the time the
+ function call was made. */
- /* Now, figure out the frame location of the caller by examining his prologue.
- We're looking for either a load of the frame pointer register, or a stack
- adjustment. */
+CORE_ADDR
+v850_frame_chain (struct frame_info *fi)
+{
+ struct prologue_info pi;
+ CORE_ADDR callers_pc, fp;
- frameoffset = 0;
+ /* First, find out who called us */
+ callers_pc = FRAME_SAVED_PC (fi);
+ /* If caller is a call-dummy, then our FP bears no relation to his FP! */
+ fp = v850_find_callers_reg (fi, FP_RAW_REGNUM);
+ if (PC_IN_CALL_DUMMY (callers_pc, fp, fp))
+ return fp; /* caller is call-dummy: return oldest value of FP */
- for (current_pc = func_addr; current_pc < prologue_end; current_pc += 2)
- {
- int insn;
+ /* Caller is NOT a call-dummy, so everything else should just work.
+ Even if THIS frame is a call-dummy! */
+ pi.pifsrs = NULL;
- insn = read_memory_integer (current_pc, 2);
+ v850_scan_prologue (callers_pc, &pi);
- if ((insn & 0xffe0) == ((SP_REGNUM << 11) | 0x0240)) /* add <imm>,sp */
- frameoffset = (insn & 0x1f) | ~0x1f;
- else if (insn == ((SP_REGNUM << 11) | 0x0600 | SP_REGNUM)) /* addi <imm>,sp,sp */
- {
- current_pc += 2;
+ if (pi.start_function)
+ return 0; /* Don't chain beyond the start function */
- frameoffset = read_memory_integer (current_pc, 2);
- }
- else if (insn == ((FP_REGNUM << 11) | 0x0000 | 12)) /* mov r12,r2 */
- return v850_find_callers_reg (fi, FP_REGNUM); /* It's using a frame pointer reg */
- else if ((insn & 0x07ff) == (0x0760 | SP_REGNUM)) /* st.w <reg>,<offset>[sp] */
- current_pc += 2;
- else if ((insn & 0x07ff) == (0x0760 | FP_REGNUM)) /* st.w <reg>,<offset>[fp] */
- current_pc += 2;
- }
+ if (pi.framereg == FP_RAW_REGNUM)
+ return v850_find_callers_reg (fi, pi.framereg);
- return fi->frame - frameoffset;
+ return fi->frame - pi.frameoffset;
}
+/* Function: find_callers_reg
+ Find REGNUM on the stack. Otherwise, it's in an active register.
+ One thing we might want to do here is to check REGNUM against the
+ clobber mask, and somehow flag it as invalid if it isn't saved on
+ the stack somewhere. This would provide a graceful failure mode
+ when trying to get the value of caller-saves registers for an inner
+ frame. */
+
+CORE_ADDR
+v850_find_callers_reg (struct frame_info *fi, int regnum)
+{
+ for (; fi; fi = fi->next)
+ if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+ return generic_read_register_dummy (fi->pc, fi->frame, regnum);
+ else if (fi->fsr.regs[regnum] != 0)
+ return read_memory_unsigned_integer (fi->fsr.regs[regnum],
+ REGISTER_RAW_SIZE (regnum));
+
+ return read_register (regnum);
+}
+
+/* Function: skip_prologue
+ Return the address of the first code past the prologue of the function. */
+
CORE_ADDR
-v850_skip_prologue (pc)
- CORE_ADDR pc;
+v850_skip_prologue (CORE_ADDR pc)
{
CORE_ADDR func_addr, func_end;
return pc;
}
-/* All we do here is record SP and FP on the call dummy stack */
+/* Function: pop_frame
+ This routine gets called when either the user uses the `return'
+ command, or the call dummy breakpoint gets hit. */
void
-v850_push_dummy_frame ()
-{
- struct dummy_frame *dummy_frame;
-
- dummy_frame = xmalloc (sizeof (struct dummy_frame));
-
- dummy_frame->fp = read_register (FP_REGNUM);
- dummy_frame->sp = read_register (SP_REGNUM);
- dummy_frame->rp = read_register (RP_REGNUM);
- dummy_frame->pc = read_register (PC_REGNUM);
- dummy_frame->next = dummy_frame_stack;
- dummy_frame_stack = dummy_frame;
-}
-
-int
-v850_pc_in_call_dummy (pc)
- CORE_ADDR pc;
-{
- return dummy_frame_stack
- && pc >= CALL_DUMMY_ADDRESS ()
- && pc <= CALL_DUMMY_ADDRESS () + DECR_PC_AFTER_BREAK;
-}
-
-struct frame_info *
-v850_pop_frame (frame)
- struct frame_info *frame;
+v850_pop_frame (struct frame_info *frame)
{
int regnum;
- if (PC_IN_CALL_DUMMY (frame->pc, NULL, NULL))
+ if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame))
+ generic_pop_dummy_frame ();
+ else
{
- struct dummy_frame *dummy_frame;
-
- dummy_frame = dummy_frame_stack;
- if (!dummy_frame)
- error ("Can't pop dummy frame!");
+ write_register (PC_REGNUM, FRAME_SAVED_PC (frame));
- dummy_frame_stack = dummy_frame->next;
+ for (regnum = 0; regnum < NUM_REGS; regnum++)
+ if (frame->fsr.regs[regnum] != 0)
+ write_register (regnum,
+ read_memory_unsigned_integer (frame->fsr.regs[regnum],
+ REGISTER_RAW_SIZE (regnum)));
- write_register (FP_REGNUM, dummy_frame->fp);
- write_register (SP_REGNUM, dummy_frame->sp);
- write_register (RP_REGNUM, dummy_frame->rp);
- write_register (PC_REGNUM, dummy_frame->pc);
-
- free (dummy_frame);
-
- flush_cached_frames ();
-
- return NULL;
+ write_register (SP_REGNUM, FRAME_FP (frame));
}
- write_register (PC_REGNUM, FRAME_SAVED_PC (frame));
-
- for (regnum = 0; regnum < NUM_REGS; regnum++)
- if (frame->fsr.regs[regnum] != 0)
- write_register (regnum, read_memory_integer (frame->fsr.regs[regnum], 4));
-
- write_register (SP_REGNUM, FRAME_FP (frame));
flush_cached_frames ();
-
- return NULL;
}
-/* Put arguments in the right places, and setup return address register (RP) to
- point at a convenient place to put a breakpoint. First four args go in
- R6->R9, subsequent args go into sp + 16 -> sp + ... Structs are passed by
- reference. 64 bit quantities (doubles and long longs) may be split between
- the regs and the stack. When calling a function that returns a struct, a
- pointer to the struct is passed in as a secret first argument (always in R6).
+/* Function: push_arguments
+ Setup arguments and RP for a call to the target. First four args
+ go in R6->R9, subsequent args go into sp + 16 -> sp + ... Structs
+ are passed by reference. 64 bit quantities (doubles and long
+ longs) may be split between the regs and the stack. When calling a
+ function that returns a struct, a pointer to the struct is passed
+ in as a secret first argument (always in R6).
- By the time we get here, stack space has been allocated for the args, but
- not for the struct return pointer. */
+ Stack space for the args has NOT been allocated: that job is up to us.
+ */
CORE_ADDR
-v850_push_arguments (nargs, args, sp, struct_return, struct_addr)
- int nargs;
- value_ptr *args;
- CORE_ADDR sp;
- unsigned char struct_return;
- CORE_ADDR struct_addr;
+v850_push_arguments (int nargs, value_ptr *args, CORE_ADDR sp,
+ unsigned char struct_return, CORE_ADDR struct_addr)
{
int argreg;
int argnum;
+ int len = 0;
+ int stack_offset;
- argreg = 6;
+ /* First, just for safety, make sure stack is aligned */
+ sp &= ~3;
+ /* Now make space on the stack for the args. */
+ for (argnum = 0; argnum < nargs; argnum++)
+ len += ((TYPE_LENGTH (VALUE_TYPE (args[argnum])) + 3) & ~3);
+ sp -= len; /* possibly over-allocating, but it works... */
+ /* (you might think we could allocate 16 bytes */
+ /* less, but the ABI seems to use it all! ) */
+ argreg = ARG0_REGNUM;
+
+ /* the struct_return pointer occupies the first parameter-passing reg */
if (struct_return)
- {
- write_register (argreg++, struct_addr);
- sp -= 4;
- }
+ write_register (argreg++, struct_addr);
+
+ stack_offset = 16;
+ /* The offset onto the stack at which we will start copying parameters
+ (after the registers are used up) begins at 16 rather than at zero.
+ I don't really know why, that's just the way it seems to work. */
+ /* Now load as many as possible of the first arguments into
+ registers, and push the rest onto the stack. There are 16 bytes
+ in four registers available. Loop thru args from first to last. */
for (argnum = 0; argnum < nargs; argnum++)
{
int len;
char *val;
- char valbuf[4];
+ char valbuf[REGISTER_RAW_SIZE (ARG0_REGNUM)];
if (TYPE_CODE (VALUE_TYPE (*args)) == TYPE_CODE_STRUCT
&& TYPE_LENGTH (VALUE_TYPE (*args)) > 8)
else
{
len = TYPE_LENGTH (VALUE_TYPE (*args));
- val = (char *)VALUE_CONTENTS (*args);
+ val = (char *) VALUE_CONTENTS (*args);
}
while (len > 0)
- if (argreg <= 9)
+ if (argreg <= ARGLAST_REGNUM)
{
CORE_ADDR regval;
}
else
{
- write_memory (sp + argnum * 4, val, 4);
+ write_memory (sp + stack_offset, val, 4);
len -= 4;
val += 4;
+ stack_offset += 4;
}
args++;
}
+ return sp;
+}
- write_register (RP_REGNUM, entry_point_address ());
+/* Function: push_return_address (pc)
+ Set up the return address for the inferior function call.
+ Needed for targets where we don't actually execute a JSR/BSR instruction */
+CORE_ADDR
+v850_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
+{
+ write_register (RP_REGNUM, CALL_DUMMY_ADDRESS ());
return sp;
}
-\f
+
+/* Function: frame_saved_pc
+ Find the caller of this frame. We do this by seeing if RP_REGNUM
+ is saved in the stack anywhere, otherwise we get it from the
+ registers. If the inner frame is a dummy frame, return its PC
+ instead of RP, because that's where "caller" of the dummy-frame
+ will be found. */
+
+CORE_ADDR
+v850_frame_saved_pc (struct frame_info *fi)
+{
+ if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+ return generic_read_register_dummy (fi->pc, fi->frame, PC_REGNUM);
+ else
+ return v850_find_callers_reg (fi, RP_REGNUM);
+}
+
+
+/* Function: fix_call_dummy
+ Pokes the callee function's address into the CALL_DUMMY assembly stub.
+ Assumes that the CALL_DUMMY looks like this:
+ jarl <offset24>, r31
+ trap
+ */
+
+int
+v850_fix_call_dummy (char *dummy, CORE_ADDR sp, CORE_ADDR fun, int nargs,
+ value_ptr *args, struct type *type, int gcc_p)
+{
+ long offset24;
+
+ offset24 = (long) fun - (long) entry_point_address ();
+ offset24 &= 0x3fffff;
+ offset24 |= 0xff800000; /* jarl <offset24>, r31 */
+
+ store_unsigned_integer ((unsigned int *) &dummy[2], 2, offset24 & 0xffff);
+ store_unsigned_integer ((unsigned int *) &dummy[0], 2, offset24 >> 16);
+ return 0;
+}
+
+/* Change the register names based on the current machine type. */
+
+static int
+v850_target_architecture_hook (const bfd_arch_info_type *ap)
+{
+ int i, j;
+
+ if (ap->arch != bfd_arch_v850)
+ return 0;
+
+ for (i = 0; v850_processor_type_table[i].regnames != NULL; i++)
+ {
+ if (v850_processor_type_table[i].mach == ap->mach)
+ {
+ v850_register_names = v850_processor_type_table[i].regnames;
+ tm_print_insn_info.mach = ap->mach;
+ return 1;
+ }
+ }
+
+ internal_error (__FILE__, __LINE__,
+ "Architecture `%s' unrecognized", ap->printable_name);
+}
+
void
-_initialize_sparc_tdep ()
+_initialize_v850_tdep (void)
{
tm_print_insn = print_insn_v850;
+ target_architecture_hook = v850_target_architecture_hook;
}
projects / deliverable / binutils-gdb.git / blobdiff