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-rw-r--r--gdb/ns32knbsd-nat.c353
1 files changed, 353 insertions, 0 deletions
diff --git a/gdb/ns32knbsd-nat.c b/gdb/ns32knbsd-nat.c
new file mode 100644
index 00000000000..c9f75cac87f
--- /dev/null
+++ b/gdb/ns32knbsd-nat.c
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+/* Functions specific to running gdb native on an ns32k running NetBSD
+ Copyright 1989, 1992, 1993, 1994, 1996 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"
+
+#define RF(dst, src) \
+ memcpy(&registers[REGISTER_BYTE(dst)], &src, sizeof(src))
+
+#define RS(src, dst) \
+ memcpy(&dst, &registers[REGISTER_BYTE(src)], sizeof(dst))
+
+void
+fetch_inferior_registers (regno)
+ int regno;
+{
+ struct reg inferior_registers;
+ struct fpreg inferior_fpregisters;
+
+ ptrace (PT_GETREGS, inferior_pid,
+ (PTRACE_ARG3_TYPE) &inferior_registers, 0);
+ ptrace (PT_GETFPREGS, inferior_pid,
+ (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 (regno)
+ 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, inferior_pid,
+ (PTRACE_ARG3_TYPE) &inferior_registers, 0);
+ ptrace (PT_SETFPREGS, inferior_pid,
+ (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. */
+static void
+fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
+ char *core_reg_sect;
+ unsigned core_reg_size;
+ int which;
+ unsigned int reg_addr; /* Unused in this version */
+{
+ 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,
+ fetch_core_registers,
+ NULL
+};
+
+void
+_initialize_ns32knbsd_nat ()
+{
+ 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 (pcb)
+ 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()
+{
+ 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(fi)
+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);
+}
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