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[/] [or1k/] [tags/] [start/] [gdb-5.0/] [gdb/] [pyr-xdep.c] - Rev 1780
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/* OBSOLETE /* Low level Pyramid interface to ptrace, for GDB when running under Unix. */ /* OBSOLETE Copyright (C) 1988, 1989, 1991 Free Software Foundation, Inc. */ /* OBSOLETE */ /* OBSOLETE This file is part of GDB. */ /* OBSOLETE */ /* OBSOLETE This program is free software; you can redistribute it and/or modify */ /* OBSOLETE it under the terms of the GNU General Public License as published by */ /* OBSOLETE the Free Software Foundation; either version 2 of the License, or */ /* OBSOLETE (at your option) any later version. */ /* OBSOLETE */ /* OBSOLETE This program is distributed in the hope that it will be useful, */ /* OBSOLETE but WITHOUT ANY WARRANTY; without even the implied warranty of */ /* OBSOLETE MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ /* OBSOLETE GNU General Public License for more details. */ /* OBSOLETE */ /* OBSOLETE You should have received a copy of the GNU General Public License */ /* OBSOLETE along with this program; if not, write to the Free Software */ /* OBSOLETE Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *x/ */ /* OBSOLETE */ /* OBSOLETE #include "defs.h" */ /* OBSOLETE #include "frame.h" */ /* OBSOLETE #include "inferior.h" */ /* OBSOLETE */ /* OBSOLETE #include <sys/param.h> */ /* OBSOLETE #include <sys/dir.h> */ /* OBSOLETE #include <signal.h> */ /* OBSOLETE #include <sys/ioctl.h> */ /* OBSOLETE /* #include <fcntl.h> Can we live without this? *x/ */ /* OBSOLETE */ /* OBSOLETE #include "gdbcore.h" */ /* OBSOLETE #include <sys/user.h> /* After a.out.h *x/ */ /* OBSOLETE #include <sys/file.h> */ /* OBSOLETE #include "gdb_stat.h" */ /* OBSOLETE */ /* OBSOLETE */ /* OBSOLETE void */ /* OBSOLETE fetch_inferior_registers (regno) */ /* OBSOLETE int regno; */ /* OBSOLETE { */ /* OBSOLETE register int datum; */ /* OBSOLETE register unsigned int regaddr; */ /* OBSOLETE int reg_buf[NUM_REGS+1]; */ /* OBSOLETE struct user u; */ /* OBSOLETE register int skipped_frames = 0; */ /* OBSOLETE */ /* OBSOLETE registers_fetched (); */ /* OBSOLETE */ /* OBSOLETE for (regno = 0; regno < 64; regno++) { */ /* OBSOLETE reg_buf[regno] = ptrace (3, inferior_pid, (PTRACE_ARG3_TYPE) regno, 0); */ /* OBSOLETE */ /* OBSOLETE #if defined(PYRAMID_CONTROL_FRAME_DEBUGGING) */ /* OBSOLETE printf_unfiltered ("Fetching register %s, got %0x\n", */ /* OBSOLETE REGISTER_NAME (regno), */ /* OBSOLETE reg_buf[regno]); */ /* OBSOLETE #endif /* PYRAMID_CONTROL_FRAME_DEBUGGING *x/ */ /* OBSOLETE */ /* OBSOLETE if (reg_buf[regno] == -1 && errno == EIO) { */ /* OBSOLETE printf_unfiltered("fetch_interior_registers: fetching register %s\n", */ /* OBSOLETE REGISTER_NAME (regno)); */ /* OBSOLETE errno = 0; */ /* OBSOLETE } */ /* OBSOLETE supply_register (regno, reg_buf+regno); */ /* OBSOLETE } */ /* OBSOLETE /* that leaves regs 64, 65, and 66 *x/ */ /* OBSOLETE datum = ptrace (3, inferior_pid, */ /* OBSOLETE (PTRACE_ARG3_TYPE) (((char *)&u.u_pcb.pcb_csp) - */ /* OBSOLETE ((char *)&u)), 0); */ /* OBSOLETE */ /* OBSOLETE */ /* OBSOLETE */ /* OBSOLETE /* FIXME: Find the Current Frame Pointer (CFP). CFP is a global */ /* OBSOLETE register (ie, NOT windowed), that gets saved in a frame iff */ /* OBSOLETE the code for that frame has a prologue (ie, "adsf N"). If */ /* OBSOLETE there is a prologue, the adsf insn saves the old cfp in */ /* OBSOLETE pr13, cfp is set to sp, and N bytes of locals are allocated */ /* OBSOLETE (sp is decremented by n). */ /* OBSOLETE This makes finding CFP hard. I guess the right way to do it */ /* OBSOLETE is: */ /* OBSOLETE - If this is the innermost frame, believe ptrace() or */ /* OBSOLETE the core area. */ /* OBSOLETE - Otherwise: */ /* OBSOLETE Find the first insn of the current frame. */ /* OBSOLETE - find the saved pc; */ /* OBSOLETE - find the call insn that saved it; */ /* OBSOLETE - figure out where the call is to; */ /* OBSOLETE - if the first insn is an adsf, we got a frame */ /* OBSOLETE pointer. *x/ */ /* OBSOLETE */ /* OBSOLETE */ /* OBSOLETE /* Normal processors have separate stack pointers for user and */ /* OBSOLETE kernel mode. Getting the last user mode frame on such */ /* OBSOLETE machines is easy: the kernel context of the ptrace()'d */ /* OBSOLETE process is on the kernel stack, and the USP points to what */ /* OBSOLETE we want. But Pyramids only have a single cfp for both user and */ /* OBSOLETE kernel mode. And processes being ptrace()'d have some */ /* OBSOLETE kernel-context control frames on their stack. */ /* OBSOLETE To avoid tracing back into the kernel context of an inferior, */ /* OBSOLETE we skip 0 or more contiguous control frames where the pc is */ /* OBSOLETE in the kernel. *x/ */ /* OBSOLETE */ /* OBSOLETE while (1) { */ /* OBSOLETE register int inferior_saved_pc; */ /* OBSOLETE inferior_saved_pc = ptrace (1, inferior_pid, */ /* OBSOLETE (PTRACE_ARG3_TYPE) (datum+((32+15)*4)), 0); */ /* OBSOLETE if (inferior_saved_pc > 0) break; */ /* OBSOLETE #if defined(PYRAMID_CONTROL_FRAME_DEBUGGING) */ /* OBSOLETE printf_unfiltered("skipping kernel frame %08x, pc=%08x\n", datum, */ /* OBSOLETE inferior_saved_pc); */ /* OBSOLETE #endif /* PYRAMID_CONTROL_FRAME_DEBUGGING *x/ */ /* OBSOLETE skipped_frames++; */ /* OBSOLETE datum -= CONTROL_STACK_FRAME_SIZE; */ /* OBSOLETE } */ /* OBSOLETE */ /* OBSOLETE reg_buf[CSP_REGNUM] = datum; */ /* OBSOLETE supply_register(CSP_REGNUM, reg_buf+CSP_REGNUM); */ /* OBSOLETE #ifdef PYRAMID_CONTROL_FRAME_DEBUGGING */ /* OBSOLETE if (skipped_frames) { */ /* OBSOLETE fprintf_unfiltered (gdb_stderr, */ /* OBSOLETE "skipped %d frames from %x to %x; cfp was %x, now %x\n", */ /* OBSOLETE skipped_frames, reg_buf[CSP_REGNUM]); */ /* OBSOLETE } */ /* OBSOLETE #endif /* PYRAMID_CONTROL_FRAME_DEBUGGING *x/ */ /* OBSOLETE } */ /* OBSOLETE */ /* OBSOLETE /* Store our register values back into the inferior. */ /* OBSOLETE If REGNO is -1, do this for all registers. */ /* OBSOLETE Otherwise, REGNO specifies which register (so we can save time). *x/ */ /* OBSOLETE */ /* OBSOLETE void */ /* OBSOLETE store_inferior_registers (regno) */ /* OBSOLETE int regno; */ /* OBSOLETE { */ /* OBSOLETE register unsigned int regaddr; */ /* OBSOLETE char buf[80]; */ /* OBSOLETE */ /* OBSOLETE if (regno >= 0) */ /* OBSOLETE { */ /* OBSOLETE if ((0 <= regno) && (regno < 64)) { */ /* OBSOLETE /*regaddr = register_addr (regno, offset);*x/ */ /* OBSOLETE regaddr = regno; */ /* OBSOLETE errno = 0; */ /* OBSOLETE ptrace (6, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, */ /* OBSOLETE read_register (regno)); */ /* OBSOLETE if (errno != 0) */ /* OBSOLETE { */ /* OBSOLETE sprintf (buf, "writing register number %d", regno); */ /* OBSOLETE perror_with_name (buf); */ /* OBSOLETE } */ /* OBSOLETE } */ /* OBSOLETE } */ /* OBSOLETE else */ /* OBSOLETE { */ /* OBSOLETE for (regno = 0; regno < NUM_REGS; regno++) */ /* OBSOLETE { */ /* OBSOLETE /*regaddr = register_addr (regno, offset);*x/ */ /* OBSOLETE regaddr = regno; */ /* OBSOLETE errno = 0; */ /* OBSOLETE ptrace (6, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, */ /* OBSOLETE read_register (regno)); */ /* OBSOLETE if (errno != 0) */ /* OBSOLETE { */ /* OBSOLETE sprintf (buf, "writing all regs, number %d", regno); */ /* OBSOLETE perror_with_name (buf); */ /* OBSOLETE } */ /* OBSOLETE } */ /* OBSOLETE } */ /* OBSOLETE */ /* OBSOLETE /*** Extensions to core and dump files, for GDB. *x/ */ /* OBSOLETE */ /* OBSOLETE extern unsigned int last_frame_offset; */ /* OBSOLETE */ /* OBSOLETE #ifdef PYRAMID_CORE */ /* OBSOLETE */ /* OBSOLETE /* Can't make definitions here static, since corefile.c needs them */ /* OBSOLETE to do bounds checking on the core-file areas. O well. *x/ */ /* OBSOLETE */ /* OBSOLETE /* have two stacks: one for data, one for register windows. *x/ */ /* OBSOLETE extern CORE_ADDR reg_stack_start; */ /* OBSOLETE extern CORE_ADDR reg_stack_end; */ /* OBSOLETE */ /* OBSOLETE /* need this so we can find the global registers: they never get saved. *x/ */ /* OBSOLETE CORE_ADDR global_reg_offset; */ /* OBSOLETE static CORE_ADDR last_frame_address; */ /* OBSOLETE CORE_ADDR last_frame_offset; */ /* OBSOLETE */ /* OBSOLETE */ /* OBSOLETE /* Address in core file of start of register window stack area. */ /* OBSOLETE Don't know if is this any of meaningful, useful or necessary. *x/ */ /* OBSOLETE extern int reg_stack_offset; */ /* OBSOLETE */ /* OBSOLETE #endif /* PYRAMID_CORE *x/ */ /* OBSOLETE */ /* OBSOLETE */ /* OBSOLETE /* Work with core dump and executable files, for GDB. */ /* OBSOLETE This code would be in corefile.c if it weren't machine-dependent. *x/ */ /* OBSOLETE */ /* OBSOLETE void */ /* OBSOLETE core_file_command (filename, from_tty) */ /* OBSOLETE char *filename; */ /* OBSOLETE int from_tty; */ /* OBSOLETE { */ /* OBSOLETE int val; */ /* OBSOLETE */ /* OBSOLETE /* Discard all vestiges of any previous core file */ /* OBSOLETE and mark data and stack spaces as empty. *x/ */ /* OBSOLETE */ /* OBSOLETE if (corefile) */ /* OBSOLETE free (corefile); */ /* OBSOLETE corefile = 0; */ /* OBSOLETE */ /* OBSOLETE if (corechan >= 0) */ /* OBSOLETE close (corechan); */ /* OBSOLETE corechan = -1; */ /* OBSOLETE */ /* OBSOLETE data_start = 0; */ /* OBSOLETE data_end = 0; */ /* OBSOLETE stack_start = STACK_END_ADDR; */ /* OBSOLETE stack_end = STACK_END_ADDR; */ /* OBSOLETE */ /* OBSOLETE #ifdef PYRAMID_CORE */ /* OBSOLETE reg_stack_start = CONTROL_STACK_ADDR; */ /* OBSOLETE reg_stack_end = CONTROL_STACK_ADDR; /* this isn't strictly true...*x/ */ /* OBSOLETE #endif /* PYRAMID_CORE *x/ */ /* OBSOLETE */ /* OBSOLETE /* Now, if a new core file was specified, open it and digest it. *x/ */ /* OBSOLETE */ /* OBSOLETE if (filename) */ /* OBSOLETE { */ /* OBSOLETE filename = tilde_expand (filename); */ /* OBSOLETE make_cleanup (free, filename); */ /* OBSOLETE */ /* OBSOLETE if (have_inferior_p ()) */ /* OBSOLETE error ("To look at a core file, you must kill the program with \"kill\"."); */ /* OBSOLETE corechan = open (filename, O_RDONLY, 0); */ /* OBSOLETE if (corechan < 0) */ /* OBSOLETE perror_with_name (filename); */ /* OBSOLETE /* 4.2-style (and perhaps also sysV-style) core dump file. *x/ */ /* OBSOLETE { */ /* OBSOLETE struct user u; */ /* OBSOLETE */ /* OBSOLETE unsigned int reg_offset; */ /* OBSOLETE */ /* OBSOLETE val = myread (corechan, &u, sizeof u); */ /* OBSOLETE if (val < 0) */ /* OBSOLETE perror_with_name ("Not a core file: reading upage"); */ /* OBSOLETE if (val != sizeof u) */ /* OBSOLETE error ("Not a core file: could only read %d bytes", val); */ /* OBSOLETE data_start = exec_data_start; */ /* OBSOLETE */ /* OBSOLETE data_end = data_start + NBPG * u.u_dsize; */ /* OBSOLETE data_offset = NBPG * UPAGES; */ /* OBSOLETE stack_offset = NBPG * (UPAGES + u.u_dsize); */ /* OBSOLETE */ /* OBSOLETE /* find registers in core file *x/ */ /* OBSOLETE #ifdef PYRAMID_PTRACE */ /* OBSOLETE stack_start = stack_end - NBPG * u.u_ussize; */ /* OBSOLETE reg_stack_offset = stack_offset + (NBPG *u.u_ussize); */ /* OBSOLETE reg_stack_end = reg_stack_start + NBPG * u.u_cssize; */ /* OBSOLETE */ /* OBSOLETE last_frame_address = ((int) u.u_pcb.pcb_csp); */ /* OBSOLETE last_frame_offset = reg_stack_offset + last_frame_address */ /* OBSOLETE - CONTROL_STACK_ADDR ; */ /* OBSOLETE global_reg_offset = (char *)&u - (char *)&u.u_pcb.pcb_gr0 ; */ /* OBSOLETE */ /* OBSOLETE /* skip any control-stack frames that were executed in the */ /* OBSOLETE kernel. *x/ */ /* OBSOLETE */ /* OBSOLETE while (1) { */ /* OBSOLETE char buf[4]; */ /* OBSOLETE val = lseek (corechan, last_frame_offset+(47*4), 0); */ /* OBSOLETE if (val < 0) */ /* OBSOLETE perror_with_name (filename); */ /* OBSOLETE val = myread (corechan, buf, sizeof buf); */ /* OBSOLETE if (val < 0) */ /* OBSOLETE perror_with_name (filename); */ /* OBSOLETE */ /* OBSOLETE if (*(int *)buf >= 0) */ /* OBSOLETE break; */ /* OBSOLETE printf_unfiltered ("skipping frame %s\n", local_hex_string (last_frame_address)); */ /* OBSOLETE last_frame_offset -= CONTROL_STACK_FRAME_SIZE; */ /* OBSOLETE last_frame_address -= CONTROL_STACK_FRAME_SIZE; */ /* OBSOLETE } */ /* OBSOLETE reg_offset = last_frame_offset; */ /* OBSOLETE */ /* OBSOLETE #if 1 || defined(PYRAMID_CONTROL_FRAME_DEBUGGING) */ /* OBSOLETE printf_unfiltered ("Control stack pointer = %s\n", */ /* OBSOLETE local_hex_string (u.u_pcb.pcb_csp)); */ /* OBSOLETE printf_unfiltered ("offset to control stack %d outermost frame %d (%s)\n", */ /* OBSOLETE reg_stack_offset, reg_offset, local_hex_string (last_frame_address)); */ /* OBSOLETE #endif /* PYRAMID_CONTROL_FRAME_DEBUGGING *x/ */ /* OBSOLETE */ /* OBSOLETE #else /* not PYRAMID_CORE *x/ */ /* OBSOLETE stack_start = stack_end - NBPG * u.u_ssize; */ /* OBSOLETE reg_offset = (int) u.u_ar0 - KERNEL_U_ADDR; */ /* OBSOLETE #endif /* not PYRAMID_CORE *x/ */ /* OBSOLETE */ /* OBSOLETE #ifdef __not_on_pyr_yet */ /* OBSOLETE /* Some machines put an absolute address in here and some put */ /* OBSOLETE the offset in the upage of the regs. *x/ */ /* OBSOLETE reg_offset = (int) u.u_ar0; */ /* OBSOLETE if (reg_offset > NBPG * UPAGES) */ /* OBSOLETE reg_offset -= KERNEL_U_ADDR; */ /* OBSOLETE #endif */ /* OBSOLETE */ /* OBSOLETE /* I don't know where to find this info. */ /* OBSOLETE So, for now, mark it as not available. *x/ */ /* OBSOLETE N_SET_MAGIC (core_aouthdr, 0); */ /* OBSOLETE */ /* OBSOLETE /* Read the register values out of the core file and store */ /* OBSOLETE them where `read_register' will find them. *x/ */ /* OBSOLETE */ /* OBSOLETE { */ /* OBSOLETE register int regno; */ /* OBSOLETE */ /* OBSOLETE for (regno = 0; regno < 64; regno++) */ /* OBSOLETE { */ /* OBSOLETE char buf[MAX_REGISTER_RAW_SIZE]; */ /* OBSOLETE */ /* OBSOLETE val = lseek (corechan, register_addr (regno, reg_offset), 0); */ /* OBSOLETE if (val < 0 */ /* OBSOLETE || (val = myread (corechan, buf, sizeof buf)) < 0) */ /* OBSOLETE { */ /* OBSOLETE char * buffer = (char *) alloca (strlen (REGISTER_NAME (regno)) */ /* OBSOLETE + 30); */ /* OBSOLETE strcpy (buffer, "Reading register "); */ /* OBSOLETE strcat (buffer, REGISTER_NAME (regno)); */ /* OBSOLETE */ /* OBSOLETE perror_with_name (buffer); */ /* OBSOLETE } */ /* OBSOLETE */ /* OBSOLETE if (val < 0) */ /* OBSOLETE perror_with_name (filename); */ /* OBSOLETE #ifdef PYRAMID_CONTROL_FRAME_DEBUGGING */ /* OBSOLETE printf_unfiltered ("[reg %s(%d), offset in file %s=0x%0x, addr =0x%0x, =%0x]\n", */ /* OBSOLETE REGISTER_NAME (regno), regno, filename, */ /* OBSOLETE register_addr(regno, reg_offset), */ /* OBSOLETE regno * 4 + last_frame_address, */ /* OBSOLETE *((int *)buf)); */ /* OBSOLETE #endif /* PYRAMID_CONTROL_FRAME_DEBUGGING *x/ */ /* OBSOLETE supply_register (regno, buf); */ /* OBSOLETE } */ /* OBSOLETE } */ /* OBSOLETE } */ /* OBSOLETE if (filename[0] == '/') */ /* OBSOLETE corefile = savestring (filename, strlen (filename)); */ /* OBSOLETE else */ /* OBSOLETE { */ /* OBSOLETE corefile = concat (current_directory, "/", filename, NULL); */ /* OBSOLETE } */ /* OBSOLETE */ /* OBSOLETE #if 1 || defined(PYRAMID_CONTROL_FRAME_DEBUGGING) */ /* OBSOLETE printf_unfiltered ("Providing CSP (%s) as nominal address of current frame.\n", */ /* OBSOLETE local_hex_string(last_frame_address)); */ /* OBSOLETE #endif PYRAMID_CONTROL_FRAME_DEBUGGING */ /* OBSOLETE /* FIXME: Which of the following is correct? *x/ */ /* OBSOLETE #if 0 */ /* OBSOLETE set_current_frame ( create_new_frame (read_register (FP_REGNUM), */ /* OBSOLETE read_pc ())); */ /* OBSOLETE #else */ /* OBSOLETE set_current_frame ( create_new_frame (last_frame_address, */ /* OBSOLETE read_pc ())); */ /* OBSOLETE #endif */ /* OBSOLETE */ /* OBSOLETE select_frame (get_current_frame (), 0); */ /* OBSOLETE validate_files (); */ /* OBSOLETE } */ /* OBSOLETE else if (from_tty) */ /* OBSOLETE printf_unfiltered ("No core file now.\n"); */ /* OBSOLETE } */
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