/* Low level interface to ptrace, for the remote server for GDB. Copyright (C) 1995, 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 "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; } /* 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; pid = wait (&w); 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 /* i386_register_raw_size[i] is the number of bytes of storage in the actual machine representation for 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 }; int i386_register_byte[MAX_NUM_REGS]; 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 table must line up with REGISTER_NAMES in tm-i386v.h */ /* symbols like 'EAX' come from */ static int regmap[] = { EAX, ECX, EDX, EBX, UESP, EBP, ESI, EDI, EIP, EFL, CS, SS, DS, ES, FS, GS, }; int i386_register_u_addr (int blockend, int regnum) { #if 0 /* this will be needed if fp registers are reinstated */ /* for now, you can look at them with 'info float' * sys5 wont let you change them with ptrace anyway */ if (regnum >= FP0_REGNUM && regnum <= FP7_REGNUM) { int ubase, fpstate; struct user u; ubase = blockend + 4 * (SS + 1) - KSTKSZ; fpstate = ubase + ((char *) &u.u_fpstate - (char *) &u); return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM)); } else #endif 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; } #endif CORE_ADDR register_addr (int regno, CORE_ADDR blockend) { CORE_ADDR addr; if (regno < 0 || regno >= ARCH_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 & -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 & -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 (); }