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[/] [or1k/] [tags/] [VER_5_3/] [gdb-5.3/] [gdb/] [lynx-nat.c] - Rev 1782
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/* Native-dependent code for LynxOS. Copyright 1993, 1994, 1995, 1996, 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 "defs.h" #include "frame.h" #include "inferior.h" #include "target.h" #include "gdbcore.h" #include "regcache.h" #include <sys/ptrace.h> #include <sys/wait.h> #include <sys/fpp.h> static unsigned long registers_addr (int pid); static void fetch_core_registers (char *, unsigned, int, CORE_ADDR); #define X(ENTRY)(offsetof(struct econtext, ENTRY)) #ifdef I386 /* Mappings from tm-i386v.h */ static int regmap[] = { X (eax), X (ecx), X (edx), X (ebx), X (esp), /* sp */ X (ebp), /* fp */ X (esi), X (edi), X (eip), /* pc */ X (flags), /* ps */ X (cs), X (ss), X (ds), X (es), X (ecode), /* Lynx doesn't give us either fs or gs, so */ X (fault), /* we just substitute these two in the hopes that they are useful. */ }; #endif /* I386 */ #ifdef M68K /* Mappings from tm-m68k.h */ static int regmap[] = { X (regs[0]), /* d0 */ X (regs[1]), /* d1 */ X (regs[2]), /* d2 */ X (regs[3]), /* d3 */ X (regs[4]), /* d4 */ X (regs[5]), /* d5 */ X (regs[6]), /* d6 */ X (regs[7]), /* d7 */ X (regs[8]), /* a0 */ X (regs[9]), /* a1 */ X (regs[10]), /* a2 */ X (regs[11]), /* a3 */ X (regs[12]), /* a4 */ X (regs[13]), /* a5 */ X (regs[14]), /* fp */ offsetof (st_t, usp) - offsetof (st_t, ec), /* sp */ X (status), /* ps */ X (pc), X (fregs[0 * 3]), /* fp0 */ X (fregs[1 * 3]), /* fp1 */ X (fregs[2 * 3]), /* fp2 */ X (fregs[3 * 3]), /* fp3 */ X (fregs[4 * 3]), /* fp4 */ X (fregs[5 * 3]), /* fp5 */ X (fregs[6 * 3]), /* fp6 */ X (fregs[7 * 3]), /* fp7 */ X (fcregs[0]), /* fpcontrol */ X (fcregs[1]), /* fpstatus */ X (fcregs[2]), /* fpiaddr */ X (ssw), /* fpcode */ X (fault), /* fpflags */ }; #endif /* M68K */ #ifdef SPARC /* Mappings from tm-sparc.h */ #define FX(ENTRY)(offsetof(struct fcontext, ENTRY)) static int regmap[] = { -1, /* g0 */ X (g1), X (g2), X (g3), X (g4), -1, /* g5->g7 aren't saved by Lynx */ -1, -1, X (o[0]), X (o[1]), X (o[2]), X (o[3]), X (o[4]), X (o[5]), X (o[6]), /* sp */ X (o[7]), /* ra */ -1, -1, -1, -1, -1, -1, -1, -1, /* l0 -> l7 */ -1, -1, -1, -1, -1, -1, -1, -1, /* i0 -> i7 */ FX (f.fregs[0]), /* f0 */ FX (f.fregs[1]), FX (f.fregs[2]), FX (f.fregs[3]), FX (f.fregs[4]), FX (f.fregs[5]), FX (f.fregs[6]), FX (f.fregs[7]), FX (f.fregs[8]), FX (f.fregs[9]), FX (f.fregs[10]), FX (f.fregs[11]), FX (f.fregs[12]), FX (f.fregs[13]), FX (f.fregs[14]), FX (f.fregs[15]), FX (f.fregs[16]), FX (f.fregs[17]), FX (f.fregs[18]), FX (f.fregs[19]), FX (f.fregs[20]), FX (f.fregs[21]), FX (f.fregs[22]), FX (f.fregs[23]), FX (f.fregs[24]), FX (f.fregs[25]), FX (f.fregs[26]), FX (f.fregs[27]), FX (f.fregs[28]), FX (f.fregs[29]), FX (f.fregs[30]), FX (f.fregs[31]), X (y), X (psr), X (wim), X (tbr), X (pc), X (npc), FX (fsr), /* fpsr */ -1, /* cpsr */ }; #endif /* SPARC */ #ifdef rs6000 static int regmap[] = { X (iregs[0]), /* r0 */ X (iregs[1]), X (iregs[2]), X (iregs[3]), X (iregs[4]), X (iregs[5]), X (iregs[6]), X (iregs[7]), X (iregs[8]), X (iregs[9]), X (iregs[10]), X (iregs[11]), X (iregs[12]), X (iregs[13]), X (iregs[14]), X (iregs[15]), X (iregs[16]), X (iregs[17]), X (iregs[18]), X (iregs[19]), X (iregs[20]), X (iregs[21]), X (iregs[22]), X (iregs[23]), X (iregs[24]), X (iregs[25]), X (iregs[26]), X (iregs[27]), X (iregs[28]), X (iregs[29]), X (iregs[30]), X (iregs[31]), X (fregs[0]), /* f0 */ X (fregs[1]), X (fregs[2]), X (fregs[3]), X (fregs[4]), X (fregs[5]), X (fregs[6]), X (fregs[7]), X (fregs[8]), X (fregs[9]), X (fregs[10]), X (fregs[11]), X (fregs[12]), X (fregs[13]), X (fregs[14]), X (fregs[15]), X (fregs[16]), X (fregs[17]), X (fregs[18]), X (fregs[19]), X (fregs[20]), X (fregs[21]), X (fregs[22]), X (fregs[23]), X (fregs[24]), X (fregs[25]), X (fregs[26]), X (fregs[27]), X (fregs[28]), X (fregs[29]), X (fregs[30]), X (fregs[31]), X (srr0), /* IAR (PC) */ X (srr1), /* MSR (PS) */ X (cr), /* CR */ X (lr), /* LR */ X (ctr), /* CTR */ X (xer), /* XER */ X (mq) /* MQ */ }; #endif /* rs6000 */ #ifdef SPARC /* This routine handles some oddball cases for Sparc registers and LynxOS. In partucular, it causes refs to G0, g5->7, and all fp regs to return zero. It also handles knows where to find the I & L regs on the stack. */ void fetch_inferior_registers (int regno) { int whatregs = 0; #define WHATREGS_FLOAT 1 #define WHATREGS_GEN 2 #define WHATREGS_STACK 4 if (regno == -1) whatregs = WHATREGS_FLOAT | WHATREGS_GEN | WHATREGS_STACK; else if (regno >= L0_REGNUM && regno <= I7_REGNUM) whatregs = WHATREGS_STACK; else if (regno >= FP0_REGNUM && regno < FP0_REGNUM + 32) whatregs = WHATREGS_FLOAT; else whatregs = WHATREGS_GEN; if (whatregs & WHATREGS_GEN) { struct econtext ec; /* general regs */ char buf[MAX_REGISTER_RAW_SIZE]; int retval; int i; errno = 0; retval = ptrace (PTRACE_GETREGS, PIDGET (inferior_ptid), (PTRACE_ARG3_TYPE) & ec, 0); if (errno) perror_with_name ("ptrace(PTRACE_GETREGS)"); memset (buf, 0, REGISTER_RAW_SIZE (G0_REGNUM)); supply_register (G0_REGNUM, buf); supply_register (TBR_REGNUM, (char *) &ec.tbr); memcpy (®isters[REGISTER_BYTE (G1_REGNUM)], &ec.g1, 4 * REGISTER_RAW_SIZE (G1_REGNUM)); for (i = G1_REGNUM; i <= G1_REGNUM + 3; i++) register_valid[i] = 1; supply_register (PS_REGNUM, (char *) &ec.psr); supply_register (Y_REGNUM, (char *) &ec.y); supply_register (PC_REGNUM, (char *) &ec.pc); supply_register (NPC_REGNUM, (char *) &ec.npc); supply_register (WIM_REGNUM, (char *) &ec.wim); memcpy (®isters[REGISTER_BYTE (O0_REGNUM)], ec.o, 8 * REGISTER_RAW_SIZE (O0_REGNUM)); for (i = O0_REGNUM; i <= O0_REGNUM + 7; i++) register_valid[i] = 1; } if (whatregs & WHATREGS_STACK) { CORE_ADDR sp; int i; sp = read_register (SP_REGNUM); target_read_memory (sp + FRAME_SAVED_I0, ®isters[REGISTER_BYTE (I0_REGNUM)], 8 * REGISTER_RAW_SIZE (I0_REGNUM)); for (i = I0_REGNUM; i <= I7_REGNUM; i++) register_valid[i] = 1; target_read_memory (sp + FRAME_SAVED_L0, ®isters[REGISTER_BYTE (L0_REGNUM)], 8 * REGISTER_RAW_SIZE (L0_REGNUM)); for (i = L0_REGNUM; i <= L0_REGNUM + 7; i++) register_valid[i] = 1; } if (whatregs & WHATREGS_FLOAT) { struct fcontext fc; /* fp regs */ int retval; int i; errno = 0; retval = ptrace (PTRACE_GETFPREGS, PIDGET (inferior_ptid), (PTRACE_ARG3_TYPE) & fc, 0); if (errno) perror_with_name ("ptrace(PTRACE_GETFPREGS)"); memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], fc.f.fregs, 32 * REGISTER_RAW_SIZE (FP0_REGNUM)); for (i = FP0_REGNUM; i <= FP0_REGNUM + 31; i++) register_valid[i] = 1; supply_register (FPS_REGNUM, (char *) &fc.fsr); } } /* This routine handles storing of the I & L regs for the Sparc. The trick here is that they actually live on the stack. The really tricky part is that when changing the stack pointer, the I & L regs must be written to where the new SP points, otherwise the regs will be incorrect when the process is started up again. We assume that the I & L regs are valid at this point. */ void store_inferior_registers (int regno) { int whatregs = 0; if (regno == -1) whatregs = WHATREGS_FLOAT | WHATREGS_GEN | WHATREGS_STACK; else if (regno >= L0_REGNUM && regno <= I7_REGNUM) whatregs = WHATREGS_STACK; else if (regno >= FP0_REGNUM && regno < FP0_REGNUM + 32) whatregs = WHATREGS_FLOAT; else if (regno == SP_REGNUM) whatregs = WHATREGS_STACK | WHATREGS_GEN; else whatregs = WHATREGS_GEN; if (whatregs & WHATREGS_GEN) { struct econtext ec; /* general regs */ int retval; ec.tbr = read_register (TBR_REGNUM); memcpy (&ec.g1, ®isters[REGISTER_BYTE (G1_REGNUM)], 4 * REGISTER_RAW_SIZE (G1_REGNUM)); ec.psr = read_register (PS_REGNUM); ec.y = read_register (Y_REGNUM); ec.pc = read_register (PC_REGNUM); ec.npc = read_register (NPC_REGNUM); ec.wim = read_register (WIM_REGNUM); memcpy (ec.o, ®isters[REGISTER_BYTE (O0_REGNUM)], 8 * REGISTER_RAW_SIZE (O0_REGNUM)); errno = 0; retval = ptrace (PTRACE_SETREGS, PIDGET (inferior_ptid), (PTRACE_ARG3_TYPE) & ec, 0); if (errno) perror_with_name ("ptrace(PTRACE_SETREGS)"); } if (whatregs & WHATREGS_STACK) { int regoffset; CORE_ADDR sp; sp = read_register (SP_REGNUM); if (regno == -1 || regno == SP_REGNUM) { if (!register_valid[L0_REGNUM + 5]) internal_error (__FILE__, __LINE__, "failed internal consistency check"); target_write_memory (sp + FRAME_SAVED_I0, ®isters[REGISTER_BYTE (I0_REGNUM)], 8 * REGISTER_RAW_SIZE (I0_REGNUM)); target_write_memory (sp + FRAME_SAVED_L0, ®isters[REGISTER_BYTE (L0_REGNUM)], 8 * REGISTER_RAW_SIZE (L0_REGNUM)); } else if (regno >= L0_REGNUM && regno <= I7_REGNUM) { if (!register_valid[regno]) internal_error (__FILE__, __LINE__, "failed internal consistency check"); if (regno >= L0_REGNUM && regno <= L0_REGNUM + 7) regoffset = REGISTER_BYTE (regno) - REGISTER_BYTE (L0_REGNUM) + FRAME_SAVED_L0; else regoffset = REGISTER_BYTE (regno) - REGISTER_BYTE (I0_REGNUM) + FRAME_SAVED_I0; target_write_memory (sp + regoffset, ®isters[REGISTER_BYTE (regno)], REGISTER_RAW_SIZE (regno)); } } if (whatregs & WHATREGS_FLOAT) { struct fcontext fc; /* fp regs */ int retval; /* We read fcontext first so that we can get good values for fq_t... */ errno = 0; retval = ptrace (PTRACE_GETFPREGS, PIDGET (inferior_ptid), (PTRACE_ARG3_TYPE) & fc, 0); if (errno) perror_with_name ("ptrace(PTRACE_GETFPREGS)"); memcpy (fc.f.fregs, ®isters[REGISTER_BYTE (FP0_REGNUM)], 32 * REGISTER_RAW_SIZE (FP0_REGNUM)); fc.fsr = read_register (FPS_REGNUM); errno = 0; retval = ptrace (PTRACE_SETFPREGS, PIDGET (inferior_ptid), (PTRACE_ARG3_TYPE) & fc, 0); if (errno) perror_with_name ("ptrace(PTRACE_SETFPREGS)"); } } #endif /* SPARC */ #if defined (I386) || defined (M68K) || defined (rs6000) /* Return the offset relative to the start of the per-thread data to the saved context block. */ static unsigned long registers_addr (int pid) { CORE_ADDR stblock; int ecpoff = offsetof (st_t, ecp); CORE_ADDR ecp; errno = 0; stblock = (CORE_ADDR) ptrace (PTRACE_THREADUSER, pid, (PTRACE_ARG3_TYPE) 0, 0); if (errno) perror_with_name ("ptrace(PTRACE_THREADUSER)"); ecp = (CORE_ADDR) ptrace (PTRACE_PEEKTHREAD, pid, (PTRACE_ARG3_TYPE) ecpoff, 0); if (errno) perror_with_name ("ptrace(PTRACE_PEEKTHREAD)"); return ecp - stblock; } /* Fetch one or more registers from the inferior. REGNO == -1 to get them all. We actually fetch more than requested, when convenient, marking them as valid so we won't fetch them again. */ void fetch_inferior_registers (int regno) { int reglo, reghi; int i; unsigned long ecp; if (regno == -1) { reglo = 0; reghi = NUM_REGS - 1; } else reglo = reghi = regno; ecp = registers_addr (PIDGET (inferior_ptid)); for (regno = reglo; regno <= reghi; regno++) { char buf[MAX_REGISTER_RAW_SIZE]; int ptrace_fun = PTRACE_PEEKTHREAD; #ifdef M68K ptrace_fun = regno == SP_REGNUM ? PTRACE_PEEKUSP : PTRACE_PEEKTHREAD; #endif for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) { unsigned int reg; errno = 0; reg = ptrace (ptrace_fun, PIDGET (inferior_ptid), (PTRACE_ARG3_TYPE) (ecp + regmap[regno] + i), 0); if (errno) perror_with_name ("ptrace(PTRACE_PEEKUSP)"); *(int *) &buf[i] = reg; } supply_register (regno, buf); } } /* 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) { int reglo, reghi; int i; unsigned long ecp; if (regno == -1) { reglo = 0; reghi = NUM_REGS - 1; } else reglo = reghi = regno; ecp = registers_addr (PIDGET (inferior_ptid)); for (regno = reglo; regno <= reghi; regno++) { int ptrace_fun = PTRACE_POKEUSER; if (CANNOT_STORE_REGISTER (regno)) continue; #ifdef M68K ptrace_fun = regno == SP_REGNUM ? PTRACE_POKEUSP : PTRACE_POKEUSER; #endif for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) { unsigned int reg; reg = *(unsigned int *) ®isters[REGISTER_BYTE (regno) + i]; errno = 0; ptrace (ptrace_fun, PIDGET (inferior_ptid), (PTRACE_ARG3_TYPE) (ecp + regmap[regno] + i), reg); if (errno) perror_with_name ("ptrace(PTRACE_POKEUSP)"); } } } #endif /* defined (I386) || defined (M68K) || defined (rs6000) */ /* Wait for child to do something. Return pid of child, or -1 in case of error; store status through argument pointer OURSTATUS. */ ptid_t child_wait (ptid_t ptid, struct target_waitstatus *ourstatus) { int save_errno; int thread; union wait status; int pid; while (1) { int sig; set_sigint_trap (); /* Causes SIGINT to be passed on to the attached process. */ pid = wait (&status); save_errno = errno; clear_sigint_trap (); if (pid == -1) { if (save_errno == EINTR) continue; fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing: %s.\n", safe_strerror (save_errno)); /* Claim it exited with unknown signal. */ ourstatus->kind = TARGET_WAITKIND_SIGNALLED; ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN; return -1; } if (pid != PIDGET (inferior_ptid)) /* Some other process?!? */ continue; thread = status.w_tid; /* Get thread id from status */ /* Initial thread value can only be acquired via wait, so we have to resort to this hack. */ if (TIDGET (inferior_ptid) == 0 && thread != 0) { inferior_ptid = MERGEPID (PIDGET (inferior_ptid), thread); add_thread (inferior_ptid); } ptid = BUILDPID (pid, thread); /* We've become a single threaded process again. */ if (thread == 0) inferior_ptid = ptid; /* Check for thread creation. */ if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && !in_thread_list (ptid)) { int realsig; realsig = ptrace (PTRACE_GETTRACESIG, PIDGET (ptid), (PTRACE_ARG3_TYPE) 0, 0); if (realsig == SIGNEWTHREAD) { /* It's a new thread notification. We don't want to much with realsig -- the code in wait_for_inferior expects SIGTRAP. */ ourstatus->kind = TARGET_WAITKIND_SPURIOUS; ourstatus->value.sig = TARGET_SIGNAL_0; return ptid; } else error ("Signal for unknown thread was not SIGNEWTHREAD"); } /* Check for thread termination. */ else if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && in_thread_list (ptid)) { int realsig; realsig = ptrace (PTRACE_GETTRACESIG, PIDGET (ptid), (PTRACE_ARG3_TYPE) 0, 0); if (realsig == SIGTHREADEXIT) { ptrace (PTRACE_CONT, PIDGET (ptid), (PTRACE_ARG3_TYPE) 0, 0); continue; } } #ifdef SPARC /* SPARC Lynx uses an byte reversed wait status; we must use the host macros to access it. These lines just a copy of store_waitstatus. We can't use CHILD_SPECIAL_WAITSTATUS because target.c can't include the Lynx <sys/wait.h>. */ if (WIFEXITED (status)) { ourstatus->kind = TARGET_WAITKIND_EXITED; ourstatus->value.integer = WEXITSTATUS (status); } else if (!WIFSTOPPED (status)) { ourstatus->kind = TARGET_WAITKIND_SIGNALLED; ourstatus->value.sig = target_signal_from_host (WTERMSIG (status)); } else { ourstatus->kind = TARGET_WAITKIND_STOPPED; ourstatus->value.sig = target_signal_from_host (WSTOPSIG (status)); } #else store_waitstatus (ourstatus, status.w_status); #endif return ptid; } } /* Return nonzero if the given thread is still alive. */ int child_thread_alive (ptid_t ptid) { int pid = PIDGET (ptid); /* Arggh. Apparently pthread_kill only works for threads within the process that calls pthread_kill. We want to avoid the lynx signal extensions as they simply don't map well to the generic gdb interface we want to keep. All we want to do is determine if a particular thread is alive; it appears as if we can just make a harmless thread specific ptrace call to do that. */ return (ptrace (PTRACE_THREADUSER, pid, 0, 0) != -1); } /* Resume execution of the inferior process. If STEP is nonzero, single-step it. If SIGNAL is nonzero, give it that signal. */ void child_resume (ptid_t ptid, int step, enum target_signal signal) { int func; int pid = PIDGET (ptid); errno = 0; /* If pid == -1, then we want to step/continue all threads, else we only want to step/continue a single thread. */ if (pid == -1) { pid = PIDGET (inferior_ptid); func = step ? PTRACE_SINGLESTEP : PTRACE_CONT; } else func = step ? PTRACE_SINGLESTEP_ONE : PTRACE_CONT_ONE; /* An address of (PTRACE_ARG3_TYPE)1 tells ptrace to continue from where it was. (If GDB wanted it to start some other way, we have already written a new PC value to the child.) If this system does not support PT_STEP, a higher level function will have called single_step() to transmute the step request into a continue request (by setting breakpoints on all possible successor instructions), so we don't have to worry about that here. */ ptrace (func, pid, (PTRACE_ARG3_TYPE) 1, target_signal_to_host (signal)); if (errno) perror_with_name ("ptrace"); } /* Convert a Lynx process ID to a string. Returns the string in a static buffer. */ char * child_pid_to_str (ptid_t ptid) { static char buf[40]; sprintf (buf, "process %d thread %d", PIDGET (ptid), TIDGET (ptid)); return buf; } /* Extract the register values out of the core file and store them where `read_register' will find them. CORE_REG_SECT points to the register values themselves, read into memory. CORE_REG_SIZE is the size of that area. WHICH says which set of registers we are handling (0 = int, 2 = float on machines where they are discontiguous). REG_ADDR is the offset from u.u_ar0 to the register values relative to core_reg_sect. This is used with old-fashioned core files to locate the registers in a large upage-plus-stack ".reg" section. Original upage address X is at location core_reg_sect+x+reg_addr. */ static void fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which, CORE_ADDR reg_addr) { struct st_entry s; unsigned int regno; for (regno = 0; regno < NUM_REGS; regno++) if (regmap[regno] != -1) supply_register (regno, core_reg_sect + offsetof (st_t, ec) + regmap[regno]); #ifdef SPARC /* Fetching this register causes all of the I & L regs to be read from the stack and validated. */ fetch_inferior_registers (I0_REGNUM); #endif } /* Register that we are able to handle lynx core file formats. FIXME: is this really bfd_target_unknown_flavour? */ static struct core_fns lynx_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_core_lynx (void) { add_core_fns (&lynx_core_fns); }
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