| /* Functions specific to running gdb native on an ns32k running NetBSD |
| Copyright 1989, 1992, 1993, 1994, 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 <sys/types.h> |
| #include <sys/ptrace.h> |
| #include <machine/reg.h> |
| #include <machine/frame.h> |
| #include <machine/pcb.h> |
| |
| #include "defs.h" |
| #include "inferior.h" |
| #include "target.h" |
| #include "gdbcore.h" |
| #include "regcache.h" |
| |
| #define RF(dst, src) \ |
| memcpy(®isters[REGISTER_BYTE(dst)], &src, sizeof(src)) |
| |
| #define RS(src, dst) \ |
| memcpy(&dst, ®isters[REGISTER_BYTE(src)], sizeof(dst)) |
| |
| void |
| fetch_inferior_registers (int regno) |
| { |
| struct reg inferior_registers; |
| struct fpreg inferior_fpregisters; |
| |
| ptrace (PT_GETREGS, PIDGET (inferior_ptid), |
| (PTRACE_ARG3_TYPE) & inferior_registers, 0); |
| ptrace (PT_GETFPREGS, PIDGET (inferior_ptid), |
| (PTRACE_ARG3_TYPE) & inferior_fpregisters, 0); |
| |
| RF (R0_REGNUM + 0, inferior_registers.r_r0); |
| RF (R0_REGNUM + 1, inferior_registers.r_r1); |
| RF (R0_REGNUM + 2, inferior_registers.r_r2); |
| RF (R0_REGNUM + 3, inferior_registers.r_r3); |
| RF (R0_REGNUM + 4, inferior_registers.r_r4); |
| RF (R0_REGNUM + 5, inferior_registers.r_r5); |
| RF (R0_REGNUM + 6, inferior_registers.r_r6); |
| RF (R0_REGNUM + 7, inferior_registers.r_r7); |
| |
| RF (SP_REGNUM, inferior_registers.r_sp); |
| RF (FP_REGNUM, inferior_registers.r_fp); |
| RF (PC_REGNUM, inferior_registers.r_pc); |
| RF (PS_REGNUM, inferior_registers.r_psr); |
| |
| RF (FPS_REGNUM, inferior_fpregisters.r_fsr); |
| RF (FP0_REGNUM + 0, inferior_fpregisters.r_freg[0]); |
| RF (FP0_REGNUM + 2, inferior_fpregisters.r_freg[2]); |
| RF (FP0_REGNUM + 4, inferior_fpregisters.r_freg[4]); |
| RF (FP0_REGNUM + 6, inferior_fpregisters.r_freg[6]); |
| RF (LP0_REGNUM + 1, inferior_fpregisters.r_freg[1]); |
| RF (LP0_REGNUM + 3, inferior_fpregisters.r_freg[3]); |
| RF (LP0_REGNUM + 5, inferior_fpregisters.r_freg[5]); |
| RF (LP0_REGNUM + 7, inferior_fpregisters.r_freg[7]); |
| registers_fetched (); |
| } |
| |
| void |
| store_inferior_registers (int regno) |
| { |
| struct reg inferior_registers; |
| struct fpreg inferior_fpregisters; |
| |
| RS (R0_REGNUM + 0, inferior_registers.r_r0); |
| RS (R0_REGNUM + 1, inferior_registers.r_r1); |
| RS (R0_REGNUM + 2, inferior_registers.r_r2); |
| RS (R0_REGNUM + 3, inferior_registers.r_r3); |
| RS (R0_REGNUM + 4, inferior_registers.r_r4); |
| RS (R0_REGNUM + 5, inferior_registers.r_r5); |
| RS (R0_REGNUM + 6, inferior_registers.r_r6); |
| RS (R0_REGNUM + 7, inferior_registers.r_r7); |
| |
| RS (SP_REGNUM, inferior_registers.r_sp); |
| RS (FP_REGNUM, inferior_registers.r_fp); |
| RS (PC_REGNUM, inferior_registers.r_pc); |
| RS (PS_REGNUM, inferior_registers.r_psr); |
| |
| RS (FPS_REGNUM, inferior_fpregisters.r_fsr); |
| RS (FP0_REGNUM + 0, inferior_fpregisters.r_freg[0]); |
| RS (FP0_REGNUM + 2, inferior_fpregisters.r_freg[2]); |
| RS (FP0_REGNUM + 4, inferior_fpregisters.r_freg[4]); |
| RS (FP0_REGNUM + 6, inferior_fpregisters.r_freg[6]); |
| RS (LP0_REGNUM + 1, inferior_fpregisters.r_freg[1]); |
| RS (LP0_REGNUM + 3, inferior_fpregisters.r_freg[3]); |
| RS (LP0_REGNUM + 5, inferior_fpregisters.r_freg[5]); |
| RS (LP0_REGNUM + 7, inferior_fpregisters.r_freg[7]); |
| |
| ptrace (PT_SETREGS, PIDGET (inferior_ptid), |
| (PTRACE_ARG3_TYPE) & inferior_registers, 0); |
| ptrace (PT_SETFPREGS, PIDGET (inferior_ptid), |
| (PTRACE_ARG3_TYPE) & inferior_fpregisters, 0); |
| } |
| |
| |
| /* XXX - Add this to machine/regs.h instead? */ |
| struct coreregs |
| { |
| struct reg intreg; |
| struct fpreg freg; |
| }; |
| |
| /* Get registers from a core file. REG_ADDR is unused. */ |
| static void |
| fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which, |
| unsigned int reg_addr) |
| { |
| struct coreregs *core_reg; |
| |
| core_reg = (struct coreregs *) core_reg_sect; |
| |
| /* |
| * We have *all* registers |
| * in the first core section. |
| * Ignore which. |
| */ |
| |
| if (core_reg_size < sizeof (*core_reg)) |
| { |
| fprintf_unfiltered (gdb_stderr, "Couldn't read regs from core file\n"); |
| return; |
| } |
| |
| /* Integer registers */ |
| RF (R0_REGNUM + 0, core_reg->intreg.r_r0); |
| RF (R0_REGNUM + 1, core_reg->intreg.r_r1); |
| RF (R0_REGNUM + 2, core_reg->intreg.r_r2); |
| RF (R0_REGNUM + 3, core_reg->intreg.r_r3); |
| RF (R0_REGNUM + 4, core_reg->intreg.r_r4); |
| RF (R0_REGNUM + 5, core_reg->intreg.r_r5); |
| RF (R0_REGNUM + 6, core_reg->intreg.r_r6); |
| RF (R0_REGNUM + 7, core_reg->intreg.r_r7); |
| |
| RF (SP_REGNUM, core_reg->intreg.r_sp); |
| RF (FP_REGNUM, core_reg->intreg.r_fp); |
| RF (PC_REGNUM, core_reg->intreg.r_pc); |
| RF (PS_REGNUM, core_reg->intreg.r_psr); |
| |
| /* Floating point registers */ |
| RF (FPS_REGNUM, core_reg->freg.r_fsr); |
| RF (FP0_REGNUM + 0, core_reg->freg.r_freg[0]); |
| RF (FP0_REGNUM + 2, core_reg->freg.r_freg[2]); |
| RF (FP0_REGNUM + 4, core_reg->freg.r_freg[4]); |
| RF (FP0_REGNUM + 6, core_reg->freg.r_freg[6]); |
| RF (LP0_REGNUM + 1, core_reg->freg.r_freg[1]); |
| RF (LP0_REGNUM + 3, core_reg->freg.r_freg[3]); |
| RF (LP0_REGNUM + 5, core_reg->freg.r_freg[5]); |
| RF (LP0_REGNUM + 7, core_reg->freg.r_freg[7]); |
| registers_fetched (); |
| } |
| |
| /* Register that we are able to handle ns32knbsd core file formats. |
| FIXME: is this really bfd_target_unknown_flavour? */ |
| |
| static struct core_fns nat_core_fns = |
| { |
| bfd_target_unknown_flavour, /* core_flavour */ |
| default_check_format, /* check_format */ |
| default_core_sniffer, /* core_sniffer */ |
| fetch_core_registers, /* core_read_registers */ |
| NULL /* next */ |
| }; |
| |
| void |
| _initialize_ns32knbsd_nat (void) |
| { |
| add_core_fns (&nat_core_fns); |
| } |
| |
| |
| /* |
| * kernel_u_size() is not helpful on NetBSD because |
| * the "u" struct is NOT in the core dump file. |
| */ |
| |
| #ifdef FETCH_KCORE_REGISTERS |
| /* |
| * Get registers from a kernel crash dump or live kernel. |
| * Called by kcore-nbsd.c:get_kcore_registers(). |
| */ |
| void |
| fetch_kcore_registers (struct pcb *pcb) |
| { |
| struct switchframe sf; |
| struct reg intreg; |
| int dummy; |
| |
| /* Integer registers */ |
| if (target_read_memory ((CORE_ADDR) pcb->pcb_ksp, (char *) &sf, sizeof sf)) |
| error ("Cannot read integer registers."); |
| |
| /* We use the psr at kernel entry */ |
| if (target_read_memory ((CORE_ADDR) pcb->pcb_onstack, (char *) &intreg, sizeof intreg)) |
| error ("Cannot read processor status register."); |
| |
| dummy = 0; |
| RF (R0_REGNUM + 0, dummy); |
| RF (R0_REGNUM + 1, dummy); |
| RF (R0_REGNUM + 2, dummy); |
| RF (R0_REGNUM + 3, sf.sf_r3); |
| RF (R0_REGNUM + 4, sf.sf_r4); |
| RF (R0_REGNUM + 5, sf.sf_r5); |
| RF (R0_REGNUM + 6, sf.sf_r6); |
| RF (R0_REGNUM + 7, sf.sf_r7); |
| |
| dummy = pcb->pcb_kfp + 8; |
| RF (SP_REGNUM, dummy); |
| RF (FP_REGNUM, sf.sf_fp); |
| RF (PC_REGNUM, sf.sf_pc); |
| RF (PS_REGNUM, intreg.r_psr); |
| |
| /* Floating point registers */ |
| RF (FPS_REGNUM, pcb->pcb_fsr); |
| RF (FP0_REGNUM + 0, pcb->pcb_freg[0]); |
| RF (FP0_REGNUM + 2, pcb->pcb_freg[2]); |
| RF (FP0_REGNUM + 4, pcb->pcb_freg[4]); |
| RF (FP0_REGNUM + 6, pcb->pcb_freg[6]); |
| RF (LP0_REGNUM + 1, pcb->pcb_freg[1]); |
| RF (LP0_REGNUM + 3, pcb->pcb_freg[3]); |
| RF (LP0_REGNUM + 5, pcb->pcb_freg[5]); |
| RF (LP0_REGNUM + 7, pcb->pcb_freg[7]); |
| registers_fetched (); |
| } |
| #endif /* FETCH_KCORE_REGISTERS */ |
| |
| void |
| clear_regs (void) |
| { |
| double zero = 0.0; |
| int null = 0; |
| |
| /* Integer registers */ |
| RF (R0_REGNUM + 0, null); |
| RF (R0_REGNUM + 1, null); |
| RF (R0_REGNUM + 2, null); |
| RF (R0_REGNUM + 3, null); |
| RF (R0_REGNUM + 4, null); |
| RF (R0_REGNUM + 5, null); |
| RF (R0_REGNUM + 6, null); |
| RF (R0_REGNUM + 7, null); |
| |
| RF (SP_REGNUM, null); |
| RF (FP_REGNUM, null); |
| RF (PC_REGNUM, null); |
| RF (PS_REGNUM, null); |
| |
| /* Floating point registers */ |
| RF (FPS_REGNUM, zero); |
| RF (FP0_REGNUM + 0, zero); |
| RF (FP0_REGNUM + 2, zero); |
| RF (FP0_REGNUM + 4, zero); |
| RF (FP0_REGNUM + 6, zero); |
| RF (LP0_REGNUM + 0, zero); |
| RF (LP0_REGNUM + 1, zero); |
| RF (LP0_REGNUM + 2, zero); |
| RF (LP0_REGNUM + 3, zero); |
| return; |
| } |
| |
| /* Return number of args passed to a frame. |
| Can return -1, meaning no way to tell. */ |
| |
| int |
| frame_num_args (struct frame_info *fi) |
| { |
| CORE_ADDR enter_addr; |
| CORE_ADDR argp; |
| int inst; |
| int args; |
| int i; |
| |
| if (read_memory_integer (fi->frame, 4) == 0 && fi->pc < 0x10000) |
| { |
| /* main is always called with three args */ |
| return (3); |
| } |
| enter_addr = ns32k_get_enter_addr (fi->pc); |
| if (enter_addr = 0) |
| return (-1); |
| argp = enter_addr == 1 ? SAVED_PC_AFTER_CALL (fi) : FRAME_SAVED_PC (fi); |
| for (i = 0; i < 16; i++) |
| { |
| /* |
| * After a bsr gcc may emit the following instructions |
| * to remove the arguments from the stack: |
| * cmpqd 0,tos - to remove 4 bytes from the stack |
| * cmpd tos,tos - to remove 8 bytes from the stack |
| * adjsp[bwd] -n - to remove n bytes from the stack |
| * Gcc sometimes delays emitting these instructions and |
| * may even throw a branch between our feet. |
| */ |
| inst = read_memory_integer (argp, 4); |
| args = read_memory_integer (argp + 2, 4); |
| if ((inst & 0xff) == 0xea) |
| { /* br */ |
| args = ((inst >> 8) & 0xffffff) | (args << 24); |
| if (args & 0x80) |
| { |
| if (args & 0x40) |
| { |
| args = ntohl (args); |
| } |
| else |
| { |
| args = ntohs (args & 0xffff); |
| if (args & 0x2000) |
| args |= 0xc000; |
| } |
| } |
| else |
| { |
| args = args & 0xff; |
| if (args & 0x40) |
| args |= 0x80; |
| } |
| argp += args; |
| continue; |
| } |
| if ((inst & 0xffff) == 0xb81f) /* cmpqd 0,tos */ |
| return (1); |
| else if ((inst & 0xffff) == 0xbdc7) /* cmpd tos,tos */ |
| return (2); |
| else if ((inst & 0xfffc) == 0xa57c) |
| { /* adjsp[bwd] */ |
| switch (inst & 3) |
| { |
| case 0: |
| args = ((args & 0xff) + 0x80); |
| break; |
| case 1: |
| args = ((ntohs (args) & 0xffff) + 0x8000); |
| break; |
| case 3: |
| args = -ntohl (args); |
| break; |
| default: |
| return (-1); |
| } |
| if (args / 4 > 10 || (args & 3) != 0) |
| continue; |
| return (args / 4); |
| } |
| argp += 1; |
| } |
| return (-1); |
| } |