diff options
Diffstat (limited to 'gdb/i386-linux-nat.c')
| -rw-r--r-- | gdb/i386-linux-nat.c | 400 |
1 files changed, 207 insertions, 193 deletions
diff --git a/gdb/i386-linux-nat.c b/gdb/i386-linux-nat.c index dddb218ba6..88b6ba2215 100644 --- a/gdb/i386-linux-nat.c +++ b/gdb/i386-linux-nat.c @@ -1,26 +1,27 @@ /* Native-dependent code for Linux running on i386's, for GDB. -This file is part of GDB. + 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 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. + 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. */ + 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 "inferior.h" #include "gdbcore.h" -/* For i386_linux_skip_solib_resolver */ +/* For i386_linux_skip_solib_resolver. */ #include "symtab.h" #include "frame.h" #include "symfile.h" @@ -34,30 +35,41 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include <sys/reg.h> #endif -/* - * Some systems (Linux) may have threads implemented as pseudo-processes, - * in which case we may be tracing more than one process at a time. - * In that case, inferior_pid will contain the main process ID and the - * individual thread (process) id mashed together. These macros are - * used to separate them out. The definitions may be overridden in tm.h - */ +/* On Linux, threads are implemented as pseudo-processes, in which + case we may be tracing more than one process at a time. In that + case, inferior_pid will contain the main process ID and the + individual thread (process) ID mashed together. These macros are + used to separate them out. These definitions should be overridden + if thread support is included. */ #if !defined (PIDGET) /* Default definition for PIDGET/TIDGET. */ #define PIDGET(PID) PID #define TIDGET(PID) 0 #endif -/* This is a duplicate of the table in i386-xdep.c. */ +/* The register sets used in Linux ELF core-dumps are identical to the + register sets in `struct user' that is used for a.out core-dumps, + and is also used by `ptrace'. The corresponding types are + `elf_gregset_t' for the general-purpose registers (with + `elf_greg_t' the type of a single GP register) and `elf_fpregset_t' + for the floating-point registers. + + Those types used to be available under the names `gregset_t' and + `fpregset_t' too, and this file used those names in the past. But + those names are now used for the register sets used in the + `mcontext_t' type, and have a different size and layout. */ + +/* 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, + DS, ES, FS, GS }; - /* Which ptrace request retrieves which registers? These apply to the corresponding SET requests as well. */ #define GETREGS_SUPPLIES(regno) \ @@ -90,129 +102,124 @@ int have_ptrace_getxfpregs = #endif ; - -/* Transfering the general registers between GDB, inferiors and core files. */ +/* Transfering the general-purpose registers between GDB, inferiors + and core files. */ + +/* Fill GDB's register array with the genereal-purpose register values + in *GREGSETP. */ -/* Given a pointer to a general register set in struct user format - (gregset_t *), unpack the register contents and supply them as - gdb's idea of the current register values. */ void -supply_gregset (gregsetp) - gregset_t *gregsetp; +supply_gregset (elf_gregset_t *gregsetp) { - register int regi; - register greg_t *regp = (greg_t *) gregsetp; + elf_greg_t *regp = (elf_greg_t *) gregsetp; + int regi; for (regi = 0; regi < NUM_GREGS; regi++) - { - supply_register (regi, (char *) (regp + regmap[regi])); - } + supply_register (regi, (char *) (regp + regmap[regi])); } +/* Convert the valid general-purpose register values in GDB's register + array to `struct user' format and store them in *GREGSETP. The + array VALID indicates which register values are valid. If VALID is + NULL, all registers are assumed to be valid. */ -/* Fill in a gregset_t object with selected data from a gdb-format - register file. - - GREGSETP points to the gregset_t object to be filled. - - GDB_REGS points to the GDB-style register file providing the data. - - VALID is an array indicating which registers in GDB_REGS are - valid; the parts of *GREGSETP that would hold registers marked - invalid in GDB_REGS are left unchanged. If VALID is zero, all - registers are assumed to be valid. */ -void -convert_to_gregset (gregset_t *gregsetp, - char *gdb_regs, - signed char *valid) +static void +convert_to_gregset (elf_gregset_t *gregsetp, signed char *valid) { + elf_greg_t *regp = (elf_greg_t *) gregsetp; int regi; - register greg_t *regp = (greg_t *) gregsetp; for (regi = 0; regi < NUM_GREGS; regi++) if (! valid || valid[regi]) *(regp + regmap[regi]) = * (int *) ®isters[REGISTER_BYTE (regi)]; } - -/* Store GDB's value for REGNO in *GREGSETP. If REGNO is -1, do all - of them. */ +/* Fill register REGNO (if it is a general-purpose register) in + *GREGSETPS with the value in GDB's register array. If REGNO is -1, + do this for all registers. */ void -fill_gregset (gregset_t *gregsetp, - int regno) +fill_gregset (elf_gregset_t *gregsetp, int regno) { if (regno == -1) - convert_to_gregset (gregsetp, registers, 0); - else if (regno >= 0 && regno < NUM_GREGS) + { + convert_to_gregset (gregsetp, NULL); + return; + } + + if (GETREGS_SUPPLIES (regno)) { signed char valid[NUM_GREGS]; + memset (valid, 0, sizeof (valid)); valid[regno] = 1; - convert_to_gregset (gregsetp, registers, valid); + + convert_to_gregset (gregsetp, valid); } } +/* Fetch all general-purpose registers from process/thread TID and + store their values in GDB's register array. */ -/* Read the general registers from the process, and store them - in registers[]. */ static void fetch_regs (int tid) { - int ret, regno; - gregset_t buf; + elf_gregset_t regs; + int ret; - ret = ptrace (PTRACE_GETREGS, tid, 0, (int) &buf); + ret = ptrace (PTRACE_GETREGS, tid, 0, (int) ®s); if (ret < 0) { - warning ("Couldn't get registers"); + warning ("Couldn't get registers."); return; } - supply_gregset (&buf); + supply_gregset (®s); } +/* Store all valid general-purpose registers in GDB's register array + into the process/thread specified by TID. */ -/* Set the inferior's general registers to the values in registers[] - --- but only those registers marked as valid. */ static void store_regs (int tid) { - int ret, regno; - gregset_t buf; + elf_gregset_t regs; + int ret; - ret = ptrace (PTRACE_GETREGS, tid, 0, (int) &buf); + ret = ptrace (PTRACE_GETREGS, tid, 0, (int) ®s); if (ret < 0) { - warning ("Couldn't get registers"); + warning ("Couldn't get registers."); return; } - convert_to_gregset (&buf, registers, register_valid); + convert_to_gregset (®s, register_valid); - ret = ptrace (PTRACE_SETREGS, tid, 0, (int)buf); + ret = ptrace (PTRACE_SETREGS, tid, 0, (int) ®s); if (ret < 0) { - warning ("Couldn't write registers"); + warning ("Couldn't write registers."); return; } } - /* Transfering floating-point registers between GDB, inferiors and cores. */ -/* What is the address of st(N) within the fpregset_t structure F? */ -#define FPREGSET_T_FPREG_ADDR(f, n) \ - ((char *) &(f)->st_space + (n) * 10) +/* What is the address of st(N) within the floating-point register set F? */ +#define FPREG_ADDR(f, n) ((char *) &(f)->st_space + (n) * 10) -/* Fill GDB's register file with the floating-point register values in +/* Fill GDB's register array with the floating-point register values in *FPREGSETP. */ + void -supply_fpregset (fpregset_t *fpregsetp) +supply_fpregset (elf_fpregset_t *fpregsetp) { - int i; + int reg; /* Supply the floating-point registers. */ - for (i = 0; i < 8; i++) - supply_register (FP0_REGNUM + i, FPREGSET_T_FPREG_ADDR (fpregsetp, i)); + for (reg = 0; reg < 8; reg++) + supply_register (FP0_REGNUM + reg, FPREG_ADDR (fpregsetp, reg)); supply_register (FCTRL_REGNUM, (char *) &fpregsetp->cwd); supply_register (FSTAT_REGNUM, (char *) &fpregsetp->swd); @@ -233,28 +240,22 @@ supply_fpregset (fpregset_t *fpregsetp) } } +/* Convert the valid floating-point register values in GDB's register + array to `struct user' format and store them in *FPREGSETP. The + array VALID indicates which register values are valid. If VALID is + NULL, all registers are assumed to be valid. */ -/* Fill in an fpregset_t structure with selected data from a - gdb-format register file. - - FPREGSETP points to the structure to be filled. - - GDB_REGS points to the GDB-style register file providing the data. - - VALID is an array indicating which registers in GDB_REGS are - valid; the parts of *FPREGSETP that would hold registers marked - invalid in GDB_REGS are left unchanged. If VALID is zero, all - registers are assumed to be valid. */ -void -convert_to_fpregset (fpregset_t *fpregsetp, - char *gdb_regs, - signed char *valid) +static void +convert_to_fpregset (elf_fpregset_t *fpregsetp, signed char *valid) { - int i; + int reg; /* Fill in the floating-point registers. */ - for (i = 0; i < 8; i++) - if (!valid || valid[i]) - memcpy (FPREGSET_T_FPREG_ADDR (fpregsetp, i), - ®isters[REGISTER_BYTE (FP0_REGNUM + i)], - REGISTER_RAW_SIZE(FP0_REGNUM + i)); + for (reg = 0; reg < 8; reg++) + if (!valid || valid[reg]) + memcpy (FPREG_ADDR (fpregsetp, reg), + ®isters[REGISTER_BYTE (FP0_REGNUM + reg)], + REGISTER_RAW_SIZE(FP0_REGNUM + reg)); #define fill(MEMBER, REGNO) \ if (! valid || valid[(REGNO)]) \ @@ -282,61 +283,71 @@ convert_to_fpregset (fpregset_t *fpregsetp, << 16)); } - -/* Given a pointer to a floating point register set in (fpregset_t *) - format, update all of the registers from gdb's idea of the current - floating point register set. */ +/* Fill register REGNO (if it is a floating-point register) in + *FPREGSETP with the value in GDB's register array. If REGNO is -1, + do this for all registers. */ void -fill_fpregset (fpregset_t *fpregsetp, - int regno) +fill_fpregset (elf_fpregset_t *fpregsetp, int regno) { - convert_to_fpregset (fpregsetp, registers, 0); + if (regno == -1) + { + convert_to_fpregset (fpregsetp, NULL); + return; + } + + if (GETFPREGS_SUPPLIES(regno)) + { + signed char valid[MAX_NUM_REGS]; + + memset (valid, 0, sizeof (valid)); + valid[regno] = 1; + + convert_to_fpregset (fpregsetp, valid); + } } +/* Fetch all floating-point registers from process/thread TID and store + thier values in GDB's register array. */ -/* Get the whole floating point state of the process and store the - floating point stack into registers[]. */ static void fetch_fpregs (int tid) { - int ret, regno; - fpregset_t buf; + elf_fpregset_t fpregs; + int ret; - ret = ptrace (PTRACE_GETFPREGS, tid, 0, (int) &buf); + ret = ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs); if (ret < 0) { - warning ("Couldn't get floating point status"); + warning ("Couldn't get floating point status."); return; } - /* ptrace fills an fpregset_t, so we can use the same function we do - for core files. */ - supply_fpregset (&buf); + supply_fpregset (&fpregs); } +/* Store all valid floating-point registers in GDB's register array + into the process/thread specified by TID. */ -/* Set the inferior's floating-point registers to the values in - registers[] --- but only those registers marked valid. */ static void store_fpregs (int tid) { + elf_fpregset_t fpregs; int ret; - fpregset_t buf; - ret = ptrace (PTRACE_GETFPREGS, tid, 0, (int) &buf); + ret = ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs); if (ret < 0) { - warning ("Couldn't get floating point status"); + warning ("Couldn't get floating point status."); return; } - convert_to_fpregset (&buf, registers, register_valid); + convert_to_fpregset (&fpregs, register_valid); - ret = ptrace (PTRACE_SETFPREGS, tid, 0, (int) &buf); + ret = ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs); if (ret < 0) { - warning ("Couldn't write floating point status"); + warning ("Couldn't write floating point status."); return; } } @@ -344,7 +355,6 @@ store_fpregs (int tid) /* Transfering floating-point and SSE registers to and from GDB. */ - /* PTRACE_GETXFPREGS is a Cygnus invention, since we wrote our own Linux kernel patch for SSE support. That patch may or may not actually make it into the official distribution. If you find that @@ -353,6 +363,10 @@ store_fpregs (int tid) you can delete this code. */ #ifdef HAVE_PTRACE_GETXFPREGS + +/* Fill GDB's register array with the floating-point and SSE register + values in *XFPREGS. */ + static void supply_xfpregset (struct user_xfpregs_struct *xfpregs) { @@ -388,10 +402,13 @@ supply_xfpregset (struct user_xfpregs_struct *xfpregs) supply_register (MXCSR_REGNUM, (char *) &xfpregs->mxcsr); } +/* Convert the valid floating-point and SSE registers in GDB's + register array to `struct user' format and store them in *XFPREGS. + The array VALID indicates which registers are valid. If VALID is + NULL, all registers are assumed to be valid. */ static void convert_to_xfpregset (struct user_xfpregs_struct *xfpregs, - char *gdb_regs, signed char *valid) { int reg; @@ -436,14 +453,15 @@ convert_to_xfpregset (struct user_xfpregs_struct *xfpregs, REGISTER_RAW_SIZE (XMM0_REGNUM + reg)); } +/* Fetch all registers covered by the PTRACE_SETXFPREGS request from + process/thread TID and store their values in GDB's register array. + Return non-zero if successful, zero otherwise. */ -/* Make a PTRACE_GETXFPREGS request, and supply all the register - values that yields to GDB. */ static int fetch_xfpregs (int tid) { - int ret; struct user_xfpregs_struct xfpregs; + int ret; if (! have_ptrace_getxfpregs) return 0; @@ -457,7 +475,7 @@ fetch_xfpregs (int tid) return 0; } - warning ("couldn't read floating-point and SSE registers."); + warning ("Couldn't read floating-point and SSE registers."); return 0; } @@ -465,14 +483,15 @@ fetch_xfpregs (int tid) return 1; } +/* Store all valid registers in GDB's register array covered by the + PTRACE_SETXFPREGS request into the process/thread specified by TID. + Return non-zero if successful, zero otherwise. */ -/* Send all the valid register values in GDB's register file covered - by the PTRACE_SETXFPREGS request to the inferior. */ static int store_xfpregs (int tid) { - int ret; struct user_xfpregs_struct xfpregs; + int ret; if (! have_ptrace_getxfpregs) return 0; @@ -486,11 +505,11 @@ store_xfpregs (int tid) return 0; } - warning ("couldn't read floating-point and SSE registers."); + warning ("Couldn't read floating-point and SSE registers."); return 0; } - convert_to_xfpregset (&xfpregs, registers, register_valid); + convert_to_xfpregset (&xfpregs, register_valid); if (ptrace (PTRACE_SETXFPREGS, tid, 0, &xfpregs) < 0) { @@ -501,13 +520,13 @@ store_xfpregs (int tid) return 1; } - -/* Fill the XMM registers in the register file with dummy values. For +/* Fill the XMM registers in the register array with dummy values. For cases where we don't have access to the XMM registers. I think this is cleaner than printing a warning. For a cleaner solution, we should gdbarchify the i386 family. */ + static void -dummy_sse_values () +dummy_sse_values (void) { /* C doesn't have a syntax for NaN's, so write it out as an array of longs. */ @@ -526,30 +545,30 @@ dummy_sse_values () PTRACE_GETXFPREGS. */ static int store_xfpregs (int tid) { return 0; } static int fetch_xfpregs (int tid) { return 0; } -static void dummy_sse_values () {} +static void dummy_sse_values (void) {} #endif /* Transferring arbitrary registers between GDB and inferior. */ -/* Fetch registers from the child process. - Fetch all if regno == -1, otherwise fetch all ordinary - registers or all floating point registers depending - upon the value of regno. */ +/* Fetch register REGNO from the child process. If REGNO is -1, do + this for all registers (including the floating point and SSE + registers). */ void fetch_inferior_registers (int regno) { - /* linux lwp id's are process id's */ int tid; + /* Linux LWP ID's are process ID's. */ if ((tid = TIDGET (inferior_pid)) == 0) - tid = inferior_pid; /* not a threaded program */ + tid = inferior_pid; /* Not a threaded program. */ - /* Use the xfpregs requests whenever possible, since they transfer - more registers in one system call, and we'll cache the results. - But remember that fetch_xfpregs can fail, and return zero. */ + /* Use the PTRACE_GETXFPREGS request whenever possible, since it + transfers more registers in one system call, and we'll cache the + results. But remember that fetch_xfpregs can fail, and return + zero. */ if (regno == -1) { fetch_regs (tid); @@ -585,25 +604,20 @@ fetch_inferior_registers (int regno) "got request for bad register number %d", regno); } - -/* Store our register values back into the inferior. - If REGNO is -1, do this for all registers. - Otherwise, REGNO specifies which register, which - then determines whether we store all ordinary - registers or all of the floating point registers. */ - +/* Store register REGNO back into the child process. If REGNO is -1, + do this for all registers (including the floating point and SSE + registers). */ void -store_inferior_registers (regno) - int regno; +store_inferior_registers (int regno) { - /* linux lwp id's are process id's */ int tid; + /* Linux LWP ID's are process ID's. */ if ((tid = TIDGET (inferior_pid)) == 0) - tid = inferior_pid; /* not a threaded program */ + tid = inferior_pid; /* Not a threaded program. */ - /* Use the xfpregs requests whenever possible, since they transfer - more registers in one system call. But remember that + /* Use the PTRACE_SETXFPREGS requests whenever possibl, since it + transfers more registers in one system call. But remember that store_xfpregs can fail, and return zero. */ if (regno == -1) { @@ -626,16 +640,15 @@ store_inferior_registers (regno) return; /* Either our processor or our kernel doesn't support the SSE - registers, so just write the FP registers in the traditional way. */ + registers, so just write the FP registers in the traditional + way. */ store_fpregs (tid); return; } - internal_error ("i386-linux-nat.c (store_inferior_registers): " - "got request to store bad register number %d", regno); + internal_error ("Got request to store bad register number %d.", regno); } - /* Interpreting register set info found in core files. */ @@ -651,26 +664,25 @@ store_inferior_registers (regno) register contents. CORE_REG_SIZE is its size. WHICH says which register set corelow suspects this is: - 0 --- the general register set, in gregset format - 2 --- the floating-point register set, in fpregset format - 3 --- the extended floating-point register set, in struct - user_xfpregs_struct format + 0 --- the general-purpose register set, in elf_gregset_t format + 2 --- the floating-point register set, in elf_fpregset_t format + 3 --- the extended floating-point register set, in struct + user_xfpregs_struct format + + REG_ADDR isn't used on Linux. */ - DUMMY isn't used on Linux. */ static void -i386_linux_fetch_core_registers (char *core_reg_sect, - unsigned core_reg_size, - int which, - CORE_ADDR dummy) +fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, + int which, CORE_ADDR reg_addr) { - gregset_t gregset; - fpregset_t fpregset; + elf_gregset_t gregset; + elf_fpregset_t fpregset; switch (which) { case 0: if (core_reg_size != sizeof (gregset)) - warning ("wrong size gregset struct in core file"); + warning ("Wrong size gregset in core file."); else { memcpy (&gregset, core_reg_sect, sizeof (gregset)); @@ -680,7 +692,7 @@ i386_linux_fetch_core_registers (char *core_reg_sect, case 2: if (core_reg_size != sizeof (fpregset)) - warning ("wrong size fpregset struct in core file"); + warning ("Wrong size fpregset in core file."); else { memcpy (&fpregset, core_reg_sect, sizeof (fpregset)); @@ -691,9 +703,10 @@ i386_linux_fetch_core_registers (char *core_reg_sect, #ifdef HAVE_PTRACE_GETXFPREGS { struct user_xfpregs_struct xfpregset; + case 3: - if (core_reg_size != sizeof (struct user_xfpregs_struct)) - warning ("wrong size user_xfpregs_struct in core file"); + if (core_reg_size != sizeof (xfpregset)) + warning ("Wrong size user_xfpregs_struct in core file."); else { memcpy (&xfpregset, core_reg_sect, sizeof (xfpregset)); @@ -711,18 +724,12 @@ i386_linux_fetch_core_registers (char *core_reg_sect, } } - -static struct core_fns i386_linux_nat_core_fns = -{ - bfd_target_elf_flavour, /* core_flavour */ - default_check_format, /* check_format */ - default_core_sniffer, /* core_sniffer */ - i386_linux_fetch_core_registers, /* core_read_registers */ - NULL /* next */ -}; - /* Calling functions in shared libraries. */ +/* FIXME: kettenis/2000-03-05: Doesn't this belong in a + target-dependent file? The function + `i386_linux_skip_solib_resolver' is mentioned in + `config/i386/tm-linux.h'. */ /* Find the minimal symbol named NAME, and return both the minsym struct and its objfile. This probably ought to be in minsym.c, but @@ -790,7 +797,6 @@ skip_hurd_resolver (CORE_ADDR pc) return 0; } - /* See the comments for SKIP_SOLIB_RESOLVER at the top of infrun.c. This function: 1) decides whether a PLT has sent us into the linker to resolve @@ -811,12 +817,20 @@ i386_linux_skip_solib_resolver (CORE_ADDR pc) return 0; } - -/* Module initialization. */ +/* Register that we are able to handle Linux ELF core file formats. */ + +static struct core_fns linux_elf_core_fns = +{ + bfd_target_elf_flavour, /* core_flavour */ + default_check_format, /* check_format */ + default_core_sniffer, /* core_sniffer */ + fetch_core_registers, /* core_read_registers */ + NULL /* next */ +}; void _initialize_i386_linux_nat () { - add_core_fns (&i386_linux_nat_core_fns); + add_core_fns (&linux_elf_core_fns); } |
