| /* Target-dependent code for the NEC V850 for GDB, the GNU debugger. |
| Copyright 1996, 1998, 1999, 2000, 2001 Free Software Foundation, Inc. |
| |
| 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 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. */ |
| |
| #include "defs.h" |
| #include "frame.h" |
| #include "inferior.h" |
| #include "obstack.h" |
| #include "target.h" |
| #include "value.h" |
| #include "bfd.h" |
| #include "gdb_string.h" |
| #include "gdbcore.h" |
| #include "symfile.h" |
| #include "arch-utils.h" |
| #include "regcache.h" |
| |
| |
| static char *v850_generic_reg_names[] = REGISTER_NAMES; |
| |
| static char *v850e_reg_names[] = |
| { |
| "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" |
| }; |
| |
| 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 |
| } |
| }; |
| |
| /* 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); |
| } |
| |
| |
| |
| /* 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; |
| } |
| |
| |
| |
| |
| /* 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) |
| { |
| CORE_ADDR func_addr, prologue_end, current_pc; |
| struct pifsr *pifsr, *pifsr_tmp; |
| int fp_used; |
| int ep_used; |
| int reg; |
| 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 (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 = pc; |
| else |
| prologue_end = sal.end; |
| #else |
| prologue_end = pc; |
| #endif |
| } |
| else |
| { /* We're in the boondocks */ |
| func_addr = pc - 100; |
| prologue_end = pc; |
| } |
| |
| prologue_end = min (prologue_end, pc); |
| |
| /* Now, search the prologue looking for instructions that setup fp, save |
| 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 insn2 = -1; /* dummy value */ |
| |
| #ifdef DEBUG |
| printf_filtered ("0x%.8lx ", (long) current_pc); |
| TARGET_PRINT_INSN (current_pc, &tm_print_insn_info); |
| #endif |
| |
| 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; |
| } |
| |
| 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 & 0xffc0) == 0x0780) /* prepare list2,imm5 */ |
| { |
| 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 */ |
| } |
| |
| 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; |
| } |
| |
| 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 (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))) |
| { |
| 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++; |
| } |
| |
| #ifdef DEBUG |
| printf_filtered ("\n"); |
| #endif |
| } |
| |
| 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 |
| } |
| |
| #ifdef DEBUG |
| printf_filtered ("Framereg = r%d, frameoffset = %d\n", pi->framereg, pi->frameoffset); |
| #endif |
| |
| return current_pc; |
| } |
| |
| /* 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(). |
| |
| 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 ()). |
| |
| 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). */ |
| |
| void |
| v850_init_extra_frame_info (struct frame_info *fi) |
| { |
| struct prologue_info pi; |
| struct pifsr pifsrs[NUM_REGS + 1], *pifsr; |
| |
| if (fi->next) |
| fi->pc = FRAME_SAVED_PC (fi->next); |
| |
| memset (fi->fsr.regs, '\000', sizeof fi->fsr.regs); |
| |
| /* 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; |
| |
| pi.pifsrs = pifsrs; |
| |
| v850_scan_prologue (fi->pc, &pi); |
| |
| if (!fi->next && pi.framereg == SP_REGNUM) |
| fi->frame = read_register (pi.framereg) - pi.frameoffset; |
| |
| for (pifsr = pifsrs; pifsr->framereg; pifsr++) |
| { |
| fi->fsr.regs[pifsr->reg] = pifsr->offset + fi->frame; |
| |
| if (pifsr->framereg == SP_REGNUM) |
| fi->fsr.regs[pifsr->reg] += pi.frameoffset; |
| } |
| } |
| |
| /* 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. */ |
| |
| CORE_ADDR |
| v850_frame_chain (struct frame_info *fi) |
| { |
| struct prologue_info pi; |
| CORE_ADDR callers_pc, fp; |
| |
| /* 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 */ |
| |
| /* Caller is NOT a call-dummy, so everything else should just work. |
| Even if THIS frame is a call-dummy! */ |
| pi.pifsrs = NULL; |
| |
| v850_scan_prologue (callers_pc, &pi); |
| |
| if (pi.start_function) |
| return 0; /* Don't chain beyond the start function */ |
| |
| if (pi.framereg == FP_RAW_REGNUM) |
| return v850_find_callers_reg (fi, pi.framereg); |
| |
| 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 (CORE_ADDR pc) |
| { |
| CORE_ADDR func_addr, func_end; |
| |
| /* See what the symbol table says */ |
| |
| if (find_pc_partial_function (pc, NULL, &func_addr, &func_end)) |
| { |
| struct symtab_and_line sal; |
| |
| sal = find_pc_line (func_addr, 0); |
| |
| if (sal.line != 0 && sal.end < func_end) |
| return sal.end; |
| else |
| /* Either there's no line info, or the line after the prologue is after |
| the end of the function. In this case, there probably isn't a |
| prologue. */ |
| return pc; |
| } |
| |
| /* We can't find the start of this function, so there's nothing we can do. */ |
| return pc; |
| } |
| |
| /* Function: pop_frame |
| This routine gets called when either the user uses the `return' |
| command, or the call dummy breakpoint gets hit. */ |
| |
| void |
| v850_pop_frame (struct frame_info *frame) |
| { |
| int regnum; |
| |
| if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame)) |
| generic_pop_dummy_frame (); |
| else |
| { |
| 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_unsigned_integer (frame->fsr.regs[regnum], |
| REGISTER_RAW_SIZE (regnum))); |
| |
| write_register (SP_REGNUM, FRAME_FP (frame)); |
| } |
| |
| flush_cached_frames (); |
| } |
| |
| /* 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). |
| |
| Stack space for the args has NOT been allocated: that job is up to us. |
| */ |
| |
| CORE_ADDR |
| v850_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
| unsigned char struct_return, CORE_ADDR struct_addr) |
| { |
| int argreg; |
| int argnum; |
| int len = 0; |
| int stack_offset; |
| |
| /* 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); |
| |
| 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[REGISTER_RAW_SIZE (ARG0_REGNUM)]; |
| |
| if (TYPE_CODE (VALUE_TYPE (*args)) == TYPE_CODE_STRUCT |
| && TYPE_LENGTH (VALUE_TYPE (*args)) > 8) |
| { |
| store_address (valbuf, 4, VALUE_ADDRESS (*args)); |
| len = 4; |
| val = valbuf; |
| } |
| else |
| { |
| len = TYPE_LENGTH (VALUE_TYPE (*args)); |
| val = (char *) VALUE_CONTENTS (*args); |
| } |
| |
| while (len > 0) |
| if (argreg <= ARGLAST_REGNUM) |
| { |
| CORE_ADDR regval; |
| |
| regval = extract_address (val, REGISTER_RAW_SIZE (argreg)); |
| write_register (argreg, regval); |
| |
| len -= REGISTER_RAW_SIZE (argreg); |
| val += REGISTER_RAW_SIZE (argreg); |
| argreg++; |
| } |
| else |
| { |
| write_memory (sp + stack_offset, val, 4); |
| |
| len -= 4; |
| val += 4; |
| stack_offset += 4; |
| } |
| args++; |
| } |
| return sp; |
| } |
| |
| /* 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; |
| } |
| |
| /* 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, |
| struct value **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_v850_tdep (void) |
| { |
| tm_print_insn = print_insn_v850; |
| target_architecture_hook = v850_target_architecture_hook; |
| } |