X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=gdb%2Fv850-tdep.c;h=534e956506628b0d18944602e79dacc09ec77cd4;hb=09d15f2aa8defb0fda30196567e391147f551128;hp=25e607dd1cf87a26af3a085d37ac3e5e053a4b9f;hpb=6420594bbf94e458e25624287aeabe3418946878;p=binutils-gdb.git diff --git a/gdb/v850-tdep.c b/gdb/v850-tdep.c index 25e607dd1cf..534e9565066 100644 --- a/gdb/v850-tdep.c +++ b/gdb/v850-tdep.c @@ -1,21 +1,22 @@ /* Target-dependent code for the NEC V850 for GDB, the GNU debugger. - Copyright 1996, Free Software Foundation, Inc. + Copyright 1996, 1998, 1999, 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" @@ -26,204 +27,621 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #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); +} -/* 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; +} + + + + +/* 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 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 & 0xffe0) == ((SP_REGNUM << 11) | 0x0240)) /* add ,sp */ - frameoffset = ((insn & 0x1f) ^ 0x10) - 0x10; - else if (insn == ((SP_REGNUM << 11) | 0x0600 | SP_REGNUM)) /* addi ,sp,sp */ - frameoffset = read_memory_integer (current_pc + 2, 2); - 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 ,[sp] */ + if ((insn & 0xffc0) == ((10 << 11) | 0x0780) && !regsave_func_p) + { /* jarl ,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 ,sp,sp */ + + 2 /* jmp [r10] */ + + (2 * 12) /* sst.w to save r2, r20-r29, r31 */ + + 20); /* slop area */ + +#ifdef DEBUG + printf_filtered ("\tfound jarl ,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 */ + 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 */ { - reg = (insn >> 11) & 0x1f; /* Extract */ +#ifdef DEBUG + printf_filtered ("\n"); +#endif + break; /* Ran into end of prologue */ + } - insn = read_memory_integer (current_pc + 2, 2) & ~1; + else if ((insn & 0xffe0) == ((SP_REGNUM << 11) | 0x0240)) /* add ,sp */ + pi->frameoffset += ((insn & 0x1f) ^ 0x10) - 0x10; + else if (insn == ((SP_REGNUM << 11) | 0x0600 | SP_REGNUM)) /* addi ,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 ,[sp] */ + || (fp_used + && (insn & 0x07ff) == (0x0760 | FP_RAW_REGNUM))) /* st.w ,[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 ,[fp] */ + + else if (ep_used /* sst.w ,[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 */ + 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, 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; - if ((insn & 0x0780) >= 0x0600) /* Four byte instruction? */ - current_pc += 2; +#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_unsigned_integer (current_pc, 2); + v850_scan_prologue (callers_pc, &pi); - if ((insn & 0xffe0) == ((SP_REGNUM << 11) | 0x0240)) /* add ,sp */ - frameoffset = ((insn & 0x1f) ^ 0x10) - 0x10; - else if (insn == ((SP_REGNUM << 11) | 0x0600 | SP_REGNUM)) /* addi ,sp,sp */ - frameoffset = read_memory_integer (current_pc + 2, 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 */ + if (pi.start_function) + return 0; /* Don't chain beyond the start function */ - if ((insn & 0x0780) >= 0x0600) /* Four byte instruction? */ - 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_skip_prologue (pc) - CORE_ADDR pc; +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; @@ -248,106 +666,81 @@ v850_skip_prologue (pc) 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!"); - - dummy_frame_stack = dummy_frame->next; + write_register (PC_REGNUM, FRAME_SAVED_PC (frame)); - 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); + 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))); - 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, 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); - 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) @@ -359,11 +752,11 @@ v850_push_arguments (nargs, args, sp, struct_return, struct_addr) else { len = TYPE_LENGTH (VALUE_TYPE (*args)); - val = (char *)VALUE_CONTENTS (*args); + val = (char *) VALUE_CONTENTS (*args); } while (len > 0) - if (argreg <= ARGLAST_REGNUM) + if (argreg <= ARGLAST_REGNUM) { CORE_ADDR regval; @@ -376,21 +769,94 @@ v850_push_arguments (nargs, args, sp, struct_return, struct_addr) } 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; } - + +/* 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 , 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 , 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; }