From da6d8c049c8b6db7b83409c37e7bc12c67027ed8 Mon Sep 17 00:00:00 2001 From: Daniel Jacobowitz Date: Tue, 5 Feb 2002 18:44:18 +0000 Subject: [PATCH] 2002-02-05 Daniel Jacobowitz * gdbserver/linux-low.c: New file, copied exactly from low-linux.c. --- gdb/ChangeLog | 4 + gdb/gdbserver/linux-low.c | 777 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 781 insertions(+) create mode 100644 gdb/gdbserver/linux-low.c diff --git a/gdb/ChangeLog b/gdb/ChangeLog index ce826dcb56..7ba3727897 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,7 @@ +2002-02-05 Daniel Jacobowitz + + * gdbserver/linux-low.c: New file, copied exactly from low-linux.c. + 2002-02-04 Pierre Muller * win32-nat.c (handle_exception): Handle Ctrl-Break exception. diff --git a/gdb/gdbserver/linux-low.c b/gdb/gdbserver/linux-low.c new file mode 100644 index 0000000000..726e276540 --- /dev/null +++ b/gdb/gdbserver/linux-low.c @@ -0,0 +1,777 @@ +/* Low level interface to ptrace, for the remote server for GDB. + Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002 + 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 "server.h" +#include +#include "frame.h" +#include "inferior.h" + +#include +#include +#include +#include +#include +#include +#include +#include + +/***************Begin MY defs*********************/ +static char my_registers[REGISTER_BYTES]; +char *registers = my_registers; +/***************End MY defs*********************/ + +#ifdef HAVE_SYS_REG_H +#include +#endif + +/* Default the type of the ptrace transfer to int. */ +#ifndef PTRACE_XFER_TYPE +#define PTRACE_XFER_TYPE int +#endif + +extern int errno; + +static void initialize_arch (void); + +/* Start an inferior process and returns its pid. + ALLARGS is a vector of program-name and args. */ + +int +create_inferior (char *program, char **allargs) +{ + int pid; + + pid = fork (); + if (pid < 0) + perror_with_name ("fork"); + + if (pid == 0) + { + ptrace (PTRACE_TRACEME, 0, 0, 0); + + execv (program, allargs); + + fprintf (stderr, "Cannot exec %s: %s.\n", program, + errno < sys_nerr ? sys_errlist[errno] : "unknown error"); + fflush (stderr); + _exit (0177); + } + + return pid; +} + +/* Attach to an inferior process. */ + +int +myattach (int pid) +{ + if (ptrace (PTRACE_ATTACH, pid, 0, 0) != 0) + { + fprintf (stderr, "Cannot attach to process %d: %s (%d)\n", pid, + errno < sys_nerr ? sys_errlist[errno] : "unknown error", + errno); + fflush (stderr); + _exit (0177); + } + + return 0; +} + +/* Kill the inferior process. Make us have no inferior. */ + +void +kill_inferior (void) +{ + if (inferior_pid == 0) + return; + ptrace (PTRACE_KILL, inferior_pid, 0, 0); + wait (0); +/*************inferior_died ();****VK**************/ +} + +/* Return nonzero if the given thread is still alive. */ +int +mythread_alive (int pid) +{ + return 1; +} + +/* Wait for process, returns status */ + +unsigned char +mywait (char *status) +{ + int pid; + union wait w; + + enable_async_io (); + pid = waitpid (inferior_pid, &w, 0); + disable_async_io (); + if (pid != inferior_pid) + perror_with_name ("wait"); + + if (WIFEXITED (w)) + { + fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); + *status = 'W'; + return ((unsigned char) WEXITSTATUS (w)); + } + else if (!WIFSTOPPED (w)) + { + fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); + *status = 'X'; + return ((unsigned char) WTERMSIG (w)); + } + + fetch_inferior_registers (0); + + *status = 'T'; + return ((unsigned char) WSTOPSIG (w)); +} + +/* Resume execution of the inferior process. + If STEP is nonzero, single-step it. + If SIGNAL is nonzero, give it that signal. */ + +void +myresume (int step, int signal) +{ + errno = 0; + ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, inferior_pid, 1, signal); + if (errno) + perror_with_name ("ptrace"); +} + + +#if !defined (offsetof) +#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) +#endif + +/* U_REGS_OFFSET is the offset of the registers within the u area. */ +#if !defined (U_REGS_OFFSET) +#define U_REGS_OFFSET \ + ptrace (PT_READ_U, inferior_pid, \ + (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \ + - KERNEL_U_ADDR +#endif + +#ifdef I386_GNULINUX_TARGET +/* This module only supports access to the general purpose registers. + Adjust the relevant constants accordingly. + + FIXME: kettenis/2001-03-28: We should really use PTRACE_GETREGS to + get at the registers. Better yet, we should try to share code with + i386-linux-nat.c. */ +#undef NUM_FREGS +#define NUM_FREGS 0 +#undef NUM_REGS +#define NUM_REGS NUM_GREGS + +/* This stuff comes from i386-tdep.c. */ + +/* i386_register_byte[i] is the offset into the register file of the + start of register number i. We initialize this from + i386_register_raw_size. */ +int i386_register_byte[MAX_NUM_REGS]; + +/* i386_register_raw_size[i] is the number of bytes of storage in + GDB's register array occupied by register i. */ +int i386_register_raw_size[MAX_NUM_REGS] = { + 4, 4, 4, 4, + 4, 4, 4, 4, + 4, 4, 4, 4, + 4, 4, 4, 4, + 10, 10, 10, 10, + 10, 10, 10, 10, + 4, 4, 4, 4, + 4, 4, 4, 4, + 16, 16, 16, 16, + 16, 16, 16, 16, + 4 +}; + +static void +initialize_arch (void) +{ + /* Initialize the table saying where each register starts in the + register file. */ + { + int i, offset; + + offset = 0; + for (i = 0; i < MAX_NUM_REGS; i++) + { + i386_register_byte[i] = offset; + offset += i386_register_raw_size[i]; + } + } +} + +/* This stuff comes from i386-linux-nat.c. */ + +/* Mapping between the general-purpose registers in `struct user' + format and GDB's register array layout. */ +static int regmap[] = +{ + EAX, ECX, EDX, EBX, + UESP, EBP, ESI, EDI, + EIP, EFL, CS, SS, + DS, ES, FS, GS +}; + +/* Return the address of register REGNUM. BLOCKEND is the value of + u.u_ar0, which should point to the registers. */ + +CORE_ADDR +register_u_addr (CORE_ADDR blockend, int regnum) +{ + return (blockend + 4 * regmap[regnum]); +} +#elif defined(TARGET_M68K) +static void +initialize_arch (void) +{ + return; +} + +/* This table must line up with REGISTER_NAMES in tm-m68k.h */ +static int regmap[] = +{ +#ifdef PT_D0 + PT_D0, PT_D1, PT_D2, PT_D3, PT_D4, PT_D5, PT_D6, PT_D7, + PT_A0, PT_A1, PT_A2, PT_A3, PT_A4, PT_A5, PT_A6, PT_USP, + PT_SR, PT_PC, +#else + 14, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, + 17, 18, +#endif +#ifdef PT_FP0 + PT_FP0, PT_FP1, PT_FP2, PT_FP3, PT_FP4, PT_FP5, PT_FP6, PT_FP7, + PT_FPCR, PT_FPSR, PT_FPIAR +#else + 21, 24, 27, 30, 33, 36, 39, 42, 45, 46, 47 +#endif +}; + +/* BLOCKEND is the value of u.u_ar0, and points to the place where GS + is stored. */ + +int +m68k_linux_register_u_addr (int blockend, int regnum) +{ + return (blockend + 4 * regmap[regnum]); +} +#elif defined(IA64_GNULINUX_TARGET) +#undef NUM_FREGS +#define NUM_FREGS 0 + +#include + +static int u_offsets[] = + { + /* general registers */ + -1, /* gr0 not available; i.e, it's always zero */ + PT_R1, + PT_R2, + PT_R3, + PT_R4, + PT_R5, + PT_R6, + PT_R7, + PT_R8, + PT_R9, + PT_R10, + PT_R11, + PT_R12, + PT_R13, + PT_R14, + PT_R15, + PT_R16, + PT_R17, + PT_R18, + PT_R19, + PT_R20, + PT_R21, + PT_R22, + PT_R23, + PT_R24, + PT_R25, + PT_R26, + PT_R27, + PT_R28, + PT_R29, + PT_R30, + PT_R31, + /* gr32 through gr127 not directly available via the ptrace interface */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + /* Floating point registers */ + -1, -1, /* f0 and f1 not available (f0 is +0.0 and f1 is +1.0) */ + PT_F2, + PT_F3, + PT_F4, + PT_F5, + PT_F6, + PT_F7, + PT_F8, + PT_F9, + PT_F10, + PT_F11, + PT_F12, + PT_F13, + PT_F14, + PT_F15, + PT_F16, + PT_F17, + PT_F18, + PT_F19, + PT_F20, + PT_F21, + PT_F22, + PT_F23, + PT_F24, + PT_F25, + PT_F26, + PT_F27, + PT_F28, + PT_F29, + PT_F30, + PT_F31, + PT_F32, + PT_F33, + PT_F34, + PT_F35, + PT_F36, + PT_F37, + PT_F38, + PT_F39, + PT_F40, + PT_F41, + PT_F42, + PT_F43, + PT_F44, + PT_F45, + PT_F46, + PT_F47, + PT_F48, + PT_F49, + PT_F50, + PT_F51, + PT_F52, + PT_F53, + PT_F54, + PT_F55, + PT_F56, + PT_F57, + PT_F58, + PT_F59, + PT_F60, + PT_F61, + PT_F62, + PT_F63, + PT_F64, + PT_F65, + PT_F66, + PT_F67, + PT_F68, + PT_F69, + PT_F70, + PT_F71, + PT_F72, + PT_F73, + PT_F74, + PT_F75, + PT_F76, + PT_F77, + PT_F78, + PT_F79, + PT_F80, + PT_F81, + PT_F82, + PT_F83, + PT_F84, + PT_F85, + PT_F86, + PT_F87, + PT_F88, + PT_F89, + PT_F90, + PT_F91, + PT_F92, + PT_F93, + PT_F94, + PT_F95, + PT_F96, + PT_F97, + PT_F98, + PT_F99, + PT_F100, + PT_F101, + PT_F102, + PT_F103, + PT_F104, + PT_F105, + PT_F106, + PT_F107, + PT_F108, + PT_F109, + PT_F110, + PT_F111, + PT_F112, + PT_F113, + PT_F114, + PT_F115, + PT_F116, + PT_F117, + PT_F118, + PT_F119, + PT_F120, + PT_F121, + PT_F122, + PT_F123, + PT_F124, + PT_F125, + PT_F126, + PT_F127, + /* predicate registers - we don't fetch these individually */ + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + /* branch registers */ + PT_B0, + PT_B1, + PT_B2, + PT_B3, + PT_B4, + PT_B5, + PT_B6, + PT_B7, + /* virtual frame pointer and virtual return address pointer */ + -1, -1, + /* other registers */ + PT_PR, + PT_CR_IIP, /* ip */ + PT_CR_IPSR, /* psr */ + PT_CFM, /* cfm */ + /* kernel registers not visible via ptrace interface (?) */ + -1, -1, -1, -1, -1, -1, -1, -1, + /* hole */ + -1, -1, -1, -1, -1, -1, -1, -1, + PT_AR_RSC, + PT_AR_BSP, + PT_AR_BSPSTORE, + PT_AR_RNAT, + -1, + -1, /* Not available: FCR, IA32 floating control register */ + -1, -1, + -1, /* Not available: EFLAG */ + -1, /* Not available: CSD */ + -1, /* Not available: SSD */ + -1, /* Not available: CFLG */ + -1, /* Not available: FSR */ + -1, /* Not available: FIR */ + -1, /* Not available: FDR */ + -1, + PT_AR_CCV, + -1, -1, -1, + PT_AR_UNAT, + -1, -1, -1, + PT_AR_FPSR, + -1, -1, -1, + -1, /* Not available: ITC */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, + PT_AR_PFS, + PT_AR_LC, + -1, /* Not available: EC, the Epilog Count register */ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, + /* nat bits - not fetched directly; instead we obtain these bits from + either rnat or unat or from memory. */ + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + }; + +int +ia64_register_u_addr (int blockend, int regnum) +{ + int addr; + + if (regnum < 0 || regnum >= NUM_REGS) + error ("Invalid register number %d.", regnum); + + addr = u_offsets[regnum]; + if (addr == -1) + addr = 0; + + return addr; +} + +static void +initialize_arch (void) +{ + return; +} + +#elif defined(ARM_GNULINUX_TARGET) +int arm_register_u_addr(blockend, regnum) + int blockend; + int regnum; +{ + return blockend + REGISTER_BYTE(regnum); +} + +static void +initialize_arch () +{ +} +#endif + +CORE_ADDR +register_addr (int regno, CORE_ADDR blockend) +{ + CORE_ADDR addr; + + if (regno < 0 || regno >= NUM_REGS) + error ("Invalid register number %d.", regno); + + REGISTER_U_ADDR (addr, blockend, regno); + + return addr; +} + +/* Fetch one register. */ + +static void +fetch_register (int regno) +{ + CORE_ADDR regaddr; + register int i; + + /* Offset of registers within the u area. */ + unsigned int offset; + + offset = U_REGS_OFFSET; + + regaddr = register_addr (regno, offset); + for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE)) + { + errno = 0; + *(PTRACE_XFER_TYPE *) ®isters[REGISTER_BYTE (regno) + i] = + ptrace (PTRACE_PEEKUSER, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, 0); + regaddr += sizeof (PTRACE_XFER_TYPE); + if (errno != 0) + { + /* Warning, not error, in case we are attached; sometimes the + kernel doesn't let us at the registers. */ + char *err = strerror (errno); + char *msg = alloca (strlen (err) + 128); + sprintf (msg, "reading register %d: %s", regno, err); + error (msg); + goto error_exit; + } + } +error_exit:; +} + +/* Fetch all registers, or just one, from the child process. */ + +void +fetch_inferior_registers (int regno) +{ + if (regno == -1 || regno == 0) + for (regno = 0; regno < NUM_REGS - NUM_FREGS; regno++) + fetch_register (regno); + else + fetch_register (regno); +} + +/* Store our register values back into the inferior. + If REGNO is -1, do this for all registers. + Otherwise, REGNO specifies which register (so we can save time). */ + +void +store_inferior_registers (int regno) +{ + CORE_ADDR regaddr; + int i; + unsigned int offset = U_REGS_OFFSET; + + if (regno >= 0) + { +#if 0 + if (CANNOT_STORE_REGISTER (regno)) + return; +#endif + regaddr = register_addr (regno, offset); + errno = 0; +#if 0 + if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) + { + scratch = *(int *) ®isters[REGISTER_BYTE (regno)] | 0x3; + ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, + scratch, 0); + if (errno != 0) + { + /* Error, even if attached. Failing to write these two + registers is pretty serious. */ + sprintf (buf, "writing register number %d", regno); + perror_with_name (buf); + } + } + else +#endif + for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) + { + errno = 0; + ptrace (PTRACE_POKEUSER, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, + *(int *) ®isters[REGISTER_BYTE (regno) + i]); + if (errno != 0) + { + /* Warning, not error, in case we are attached; sometimes the + kernel doesn't let us at the registers. */ + char *err = strerror (errno); + char *msg = alloca (strlen (err) + 128); + sprintf (msg, "writing register %d: %s", + regno, err); + error (msg); + return; + } + regaddr += sizeof (int); + } + } + else + for (regno = 0; regno < NUM_REGS - NUM_FREGS; regno++) + store_inferior_registers (regno); +} + +/* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory + in the NEW_SUN_PTRACE case. + It ought to be straightforward. But it appears that writing did + not write the data that I specified. I cannot understand where + it got the data that it actually did write. */ + +/* Copy LEN bytes from inferior's memory starting at MEMADDR + to debugger memory starting at MYADDR. */ + +void +read_inferior_memory (CORE_ADDR memaddr, char *myaddr, int len) +{ + register int i; + /* Round starting address down to longword boundary. */ + register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); + /* Round ending address up; get number of longwords that makes. */ + register int count + = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) + / sizeof (PTRACE_XFER_TYPE); + /* Allocate buffer of that many longwords. */ + register PTRACE_XFER_TYPE *buffer + = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); + + /* Read all the longwords */ + for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) + { + buffer[i] = ptrace (PTRACE_PEEKTEXT, inferior_pid, addr, 0); + } + + /* Copy appropriate bytes out of the buffer. */ + memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), len); +} + +/* Copy LEN bytes of data from debugger memory at MYADDR + to inferior's memory at MEMADDR. + On failure (cannot write the inferior) + returns the value of errno. */ + +int +write_inferior_memory (CORE_ADDR memaddr, char *myaddr, int len) +{ + register int i; + /* Round starting address down to longword boundary. */ + register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); + /* Round ending address up; get number of longwords that makes. */ + register int count + = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE); + /* Allocate buffer of that many longwords. */ + register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); + extern int errno; + + /* Fill start and end extra bytes of buffer with existing memory data. */ + + buffer[0] = ptrace (PTRACE_PEEKTEXT, inferior_pid, addr, 0); + + if (count > 1) + { + buffer[count - 1] + = ptrace (PTRACE_PEEKTEXT, inferior_pid, + addr + (count - 1) * sizeof (PTRACE_XFER_TYPE), 0); + } + + /* Copy data to be written over corresponding part of buffer */ + + memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len); + + /* Write the entire buffer. */ + + for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) + { + errno = 0; + ptrace (PTRACE_POKETEXT, inferior_pid, addr, buffer[i]); + if (errno) + return errno; + } + + return 0; +} + +void +initialize_low (void) +{ + initialize_arch (); +} -- 2.34.1