From: Simon Marchi Date: Tue, 16 Nov 2021 03:04:20 +0000 (-0500) Subject: gdb: rename rs6000-nat.c to rs6000-aix-nat.c X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=80e7a6cb76071ac4e561cd4de66923634c495bdd;p=binutils-gdb.git gdb: rename rs6000-nat.c to rs6000-aix-nat.c This file seems to be AIX-specific, according to its contents and configure.nat. Rename it to rs6000-aix-nat.c, to make that clear (and to follow the convention). Change-Id: Ib418dddc6b79b2e28f64431121742b5e87f5f4f5 --- diff --git a/gdb/Makefile.in b/gdb/Makefile.in index a51d63755ef..5e6d74e455e 100644 --- a/gdb/Makefile.in +++ b/gdb/Makefile.in @@ -2288,8 +2288,8 @@ ALLDEPFILES = \ riscv-ravenscar-thread.c \ riscv-tdep.c \ rl78-tdep.c \ + rs6000-aix-nat.c \ rs6000-lynx178-tdep.c \ - rs6000-nat.c \ rs6000-tdep.c \ rx-tdep.c \ s390-linux-nat.c \ diff --git a/gdb/configure.nat b/gdb/configure.nat index d42cf13e691..bdd05032602 100644 --- a/gdb/configure.nat +++ b/gdb/configure.nat @@ -103,7 +103,7 @@ case ${gdb_host} in # Host: IBM PowerPC running AIX aix-thread.o is not # listed in NATDEPFILES as it is pulled in by # configure. - NATDEPFILES="${NATDEPFILES} rs6000-nat.o" + NATDEPFILES="${NATDEPFILES} rs6000-aix-nat.o" # When compiled with cc, for debugging, this argument # should be passed. We have no idea who our current diff --git a/gdb/rs6000-aix-nat.c b/gdb/rs6000-aix-nat.c new file mode 100644 index 00000000000..c266c50777f --- /dev/null +++ b/gdb/rs6000-aix-nat.c @@ -0,0 +1,675 @@ +/* IBM RS/6000 native-dependent code for GDB, the GNU debugger. + + Copyright (C) 1986-2021 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 3 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, see . */ + +#include "defs.h" +#include "inferior.h" +#include "target.h" +#include "gdbcore.h" +#include "symfile.h" +#include "objfiles.h" +#include "bfd.h" +#include "gdb-stabs.h" +#include "regcache.h" +#include "arch-utils.h" +#include "inf-child.h" +#include "inf-ptrace.h" +#include "ppc-tdep.h" +#include "rs6000-tdep.h" +#include "rs6000-aix-tdep.h" +#include "exec.h" +#include "observable.h" +#include "xcoffread.h" + +#include +#include + +#include +#include +#include +#include +#include + +#include +#include +#include +#include "gdb_bfd.h" +#include +#define __LDINFO_PTRACE32__ /* for __ld_info32 */ +#define __LDINFO_PTRACE64__ /* for __ld_info64 */ +#include +#include + +/* On AIX4.3+, sys/ldr.h provides different versions of struct ld_info for + debugging 32-bit and 64-bit processes. Define a typedef and macros for + accessing fields in the appropriate structures. */ + +/* In 32-bit compilation mode (which is the only mode from which ptrace() + works on 4.3), __ld_info32 is #defined as equivalent to ld_info. */ + +#if defined (__ld_info32) || defined (__ld_info64) +# define ARCH3264 +#endif + +/* Return whether the current architecture is 64-bit. */ + +#ifndef ARCH3264 +# define ARCH64() 0 +#else +# define ARCH64() (register_size (target_gdbarch (), 0) == 8) +#endif + +class rs6000_nat_target final : public inf_ptrace_target +{ +public: + void fetch_registers (struct regcache *, int) override; + void store_registers (struct regcache *, int) override; + + enum target_xfer_status xfer_partial (enum target_object object, + const char *annex, + gdb_byte *readbuf, + const gdb_byte *writebuf, + ULONGEST offset, ULONGEST len, + ULONGEST *xfered_len) override; + + void create_inferior (const char *, const std::string &, + char **, int) override; + + ptid_t wait (ptid_t, struct target_waitstatus *, target_wait_flags) override; + +private: + enum target_xfer_status + xfer_shared_libraries (enum target_object object, + const char *annex, gdb_byte *readbuf, + const gdb_byte *writebuf, + ULONGEST offset, ULONGEST len, + ULONGEST *xfered_len); +}; + +static rs6000_nat_target the_rs6000_nat_target; + +/* Given REGNO, a gdb register number, return the corresponding + number suitable for use as a ptrace() parameter. Return -1 if + there's no suitable mapping. Also, set the int pointed to by + ISFLOAT to indicate whether REGNO is a floating point register. */ + +static int +regmap (struct gdbarch *gdbarch, int regno, int *isfloat) +{ + ppc_gdbarch_tdep *tdep = (ppc_gdbarch_tdep *) gdbarch_tdep (gdbarch); + + *isfloat = 0; + if (tdep->ppc_gp0_regnum <= regno + && regno < tdep->ppc_gp0_regnum + ppc_num_gprs) + return regno; + else if (tdep->ppc_fp0_regnum >= 0 + && tdep->ppc_fp0_regnum <= regno + && regno < tdep->ppc_fp0_regnum + ppc_num_fprs) + { + *isfloat = 1; + return regno - tdep->ppc_fp0_regnum + FPR0; + } + else if (regno == gdbarch_pc_regnum (gdbarch)) + return IAR; + else if (regno == tdep->ppc_ps_regnum) + return MSR; + else if (regno == tdep->ppc_cr_regnum) + return CR; + else if (regno == tdep->ppc_lr_regnum) + return LR; + else if (regno == tdep->ppc_ctr_regnum) + return CTR; + else if (regno == tdep->ppc_xer_regnum) + return XER; + else if (tdep->ppc_fpscr_regnum >= 0 + && regno == tdep->ppc_fpscr_regnum) + return FPSCR; + else if (tdep->ppc_mq_regnum >= 0 && regno == tdep->ppc_mq_regnum) + return MQ; + else + return -1; +} + +/* Call ptrace(REQ, ID, ADDR, DATA, BUF). */ + +static int +rs6000_ptrace32 (int req, int id, int *addr, int data, int *buf) +{ +#ifdef HAVE_PTRACE64 + int ret = ptrace64 (req, id, (uintptr_t) addr, data, buf); +#else + int ret = ptrace (req, id, (int *)addr, data, buf); +#endif +#if 0 + printf ("rs6000_ptrace32 (%d, %d, 0x%x, %08x, 0x%x) = 0x%x\n", + req, id, (unsigned int)addr, data, (unsigned int)buf, ret); +#endif + return ret; +} + +/* Call ptracex(REQ, ID, ADDR, DATA, BUF). */ + +static int +rs6000_ptrace64 (int req, int id, long long addr, int data, void *buf) +{ +#ifdef ARCH3264 +# ifdef HAVE_PTRACE64 + int ret = ptrace64 (req, id, addr, data, (PTRACE_TYPE_ARG5) buf); +# else + int ret = ptracex (req, id, addr, data, (PTRACE_TYPE_ARG5) buf); +# endif +#else + int ret = 0; +#endif +#if 0 + printf ("rs6000_ptrace64 (%d, %d, %s, %08x, 0x%x) = 0x%x\n", + req, id, hex_string (addr), data, (unsigned int)buf, ret); +#endif + return ret; +} + +/* Fetch register REGNO from the inferior. */ + +static void +fetch_register (struct regcache *regcache, int regno) +{ + struct gdbarch *gdbarch = regcache->arch (); + int addr[PPC_MAX_REGISTER_SIZE]; + int nr, isfloat; + pid_t pid = regcache->ptid ().pid (); + + /* Retrieved values may be -1, so infer errors from errno. */ + errno = 0; + + nr = regmap (gdbarch, regno, &isfloat); + + /* Floating-point registers. */ + if (isfloat) + rs6000_ptrace32 (PT_READ_FPR, pid, addr, nr, 0); + + /* Bogus register number. */ + else if (nr < 0) + { + if (regno >= gdbarch_num_regs (gdbarch)) + fprintf_unfiltered (gdb_stderr, + "gdb error: register no %d not implemented.\n", + regno); + return; + } + + /* Fixed-point registers. */ + else + { + if (!ARCH64 ()) + *addr = rs6000_ptrace32 (PT_READ_GPR, pid, (int *) nr, 0, 0); + else + { + /* PT_READ_GPR requires the buffer parameter to point to long long, + even if the register is really only 32 bits. */ + long long buf; + rs6000_ptrace64 (PT_READ_GPR, pid, nr, 0, &buf); + if (register_size (gdbarch, regno) == 8) + memcpy (addr, &buf, 8); + else + *addr = buf; + } + } + + if (!errno) + regcache->raw_supply (regno, (char *) addr); + else + { +#if 0 + /* FIXME: this happens 3 times at the start of each 64-bit program. */ + perror (_("ptrace read")); +#endif + errno = 0; + } +} + +/* Store register REGNO back into the inferior. */ + +static void +store_register (struct regcache *regcache, int regno) +{ + struct gdbarch *gdbarch = regcache->arch (); + int addr[PPC_MAX_REGISTER_SIZE]; + int nr, isfloat; + pid_t pid = regcache->ptid ().pid (); + + /* Fetch the register's value from the register cache. */ + regcache->raw_collect (regno, addr); + + /* -1 can be a successful return value, so infer errors from errno. */ + errno = 0; + + nr = regmap (gdbarch, regno, &isfloat); + + /* Floating-point registers. */ + if (isfloat) + rs6000_ptrace32 (PT_WRITE_FPR, pid, addr, nr, 0); + + /* Bogus register number. */ + else if (nr < 0) + { + if (regno >= gdbarch_num_regs (gdbarch)) + fprintf_unfiltered (gdb_stderr, + "gdb error: register no %d not implemented.\n", + regno); + } + + /* Fixed-point registers. */ + else + { + /* The PT_WRITE_GPR operation is rather odd. For 32-bit inferiors, + the register's value is passed by value, but for 64-bit inferiors, + the address of a buffer containing the value is passed. */ + if (!ARCH64 ()) + rs6000_ptrace32 (PT_WRITE_GPR, pid, (int *) nr, *addr, 0); + else + { + /* PT_WRITE_GPR requires the buffer parameter to point to an 8-byte + area, even if the register is really only 32 bits. */ + long long buf; + if (register_size (gdbarch, regno) == 8) + memcpy (&buf, addr, 8); + else + buf = *addr; + rs6000_ptrace64 (PT_WRITE_GPR, pid, nr, 0, &buf); + } + } + + if (errno) + { + perror (_("ptrace write")); + errno = 0; + } +} + +/* Read from the inferior all registers if REGNO == -1 and just register + REGNO otherwise. */ + +void +rs6000_nat_target::fetch_registers (struct regcache *regcache, int regno) +{ + struct gdbarch *gdbarch = regcache->arch (); + if (regno != -1) + fetch_register (regcache, regno); + + else + { + ppc_gdbarch_tdep *tdep = (ppc_gdbarch_tdep *) gdbarch_tdep (gdbarch); + + /* Read 32 general purpose registers. */ + for (regno = tdep->ppc_gp0_regnum; + regno < tdep->ppc_gp0_regnum + ppc_num_gprs; + regno++) + { + fetch_register (regcache, regno); + } + + /* Read general purpose floating point registers. */ + if (tdep->ppc_fp0_regnum >= 0) + for (regno = 0; regno < ppc_num_fprs; regno++) + fetch_register (regcache, tdep->ppc_fp0_regnum + regno); + + /* Read special registers. */ + fetch_register (regcache, gdbarch_pc_regnum (gdbarch)); + fetch_register (regcache, tdep->ppc_ps_regnum); + fetch_register (regcache, tdep->ppc_cr_regnum); + fetch_register (regcache, tdep->ppc_lr_regnum); + fetch_register (regcache, tdep->ppc_ctr_regnum); + fetch_register (regcache, tdep->ppc_xer_regnum); + if (tdep->ppc_fpscr_regnum >= 0) + fetch_register (regcache, tdep->ppc_fpscr_regnum); + if (tdep->ppc_mq_regnum >= 0) + fetch_register (regcache, tdep->ppc_mq_regnum); + } +} + +/* 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 +rs6000_nat_target::store_registers (struct regcache *regcache, int regno) +{ + struct gdbarch *gdbarch = regcache->arch (); + if (regno != -1) + store_register (regcache, regno); + + else + { + ppc_gdbarch_tdep *tdep = (ppc_gdbarch_tdep *) gdbarch_tdep (gdbarch); + + /* Write general purpose registers first. */ + for (regno = tdep->ppc_gp0_regnum; + regno < tdep->ppc_gp0_regnum + ppc_num_gprs; + regno++) + { + store_register (regcache, regno); + } + + /* Write floating point registers. */ + if (tdep->ppc_fp0_regnum >= 0) + for (regno = 0; regno < ppc_num_fprs; regno++) + store_register (regcache, tdep->ppc_fp0_regnum + regno); + + /* Write special registers. */ + store_register (regcache, gdbarch_pc_regnum (gdbarch)); + store_register (regcache, tdep->ppc_ps_regnum); + store_register (regcache, tdep->ppc_cr_regnum); + store_register (regcache, tdep->ppc_lr_regnum); + store_register (regcache, tdep->ppc_ctr_regnum); + store_register (regcache, tdep->ppc_xer_regnum); + if (tdep->ppc_fpscr_regnum >= 0) + store_register (regcache, tdep->ppc_fpscr_regnum); + if (tdep->ppc_mq_regnum >= 0) + store_register (regcache, tdep->ppc_mq_regnum); + } +} + +/* Implement the to_xfer_partial target_ops method. */ + +enum target_xfer_status +rs6000_nat_target::xfer_partial (enum target_object object, + const char *annex, gdb_byte *readbuf, + const gdb_byte *writebuf, + ULONGEST offset, ULONGEST len, + ULONGEST *xfered_len) +{ + pid_t pid = inferior_ptid.pid (); + int arch64 = ARCH64 (); + + switch (object) + { + case TARGET_OBJECT_LIBRARIES_AIX: + return xfer_shared_libraries (object, annex, + readbuf, writebuf, + offset, len, xfered_len); + case TARGET_OBJECT_MEMORY: + { + union + { + PTRACE_TYPE_RET word; + gdb_byte byte[sizeof (PTRACE_TYPE_RET)]; + } buffer; + ULONGEST rounded_offset; + LONGEST partial_len; + + /* Round the start offset down to the next long word + boundary. */ + rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET); + + /* Since ptrace will transfer a single word starting at that + rounded_offset the partial_len needs to be adjusted down to + that (remember this function only does a single transfer). + Should the required length be even less, adjust it down + again. */ + partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset; + if (partial_len > len) + partial_len = len; + + if (writebuf) + { + /* If OFFSET:PARTIAL_LEN is smaller than + ROUNDED_OFFSET:WORDSIZE then a read/modify write will + be needed. Read in the entire word. */ + if (rounded_offset < offset + || (offset + partial_len + < rounded_offset + sizeof (PTRACE_TYPE_RET))) + { + /* Need part of initial word -- fetch it. */ + if (arch64) + buffer.word = rs6000_ptrace64 (PT_READ_I, pid, + rounded_offset, 0, NULL); + else + buffer.word = rs6000_ptrace32 (PT_READ_I, pid, + (int *) (uintptr_t) + rounded_offset, + 0, NULL); + } + + /* Copy data to be written over corresponding part of + buffer. */ + memcpy (buffer.byte + (offset - rounded_offset), + writebuf, partial_len); + + errno = 0; + if (arch64) + rs6000_ptrace64 (PT_WRITE_D, pid, + rounded_offset, buffer.word, NULL); + else + rs6000_ptrace32 (PT_WRITE_D, pid, + (int *) (uintptr_t) rounded_offset, + buffer.word, NULL); + if (errno) + return TARGET_XFER_EOF; + } + + if (readbuf) + { + errno = 0; + if (arch64) + buffer.word = rs6000_ptrace64 (PT_READ_I, pid, + rounded_offset, 0, NULL); + else + buffer.word = rs6000_ptrace32 (PT_READ_I, pid, + (int *)(uintptr_t)rounded_offset, + 0, NULL); + if (errno) + return TARGET_XFER_EOF; + + /* Copy appropriate bytes out of the buffer. */ + memcpy (readbuf, buffer.byte + (offset - rounded_offset), + partial_len); + } + + *xfered_len = (ULONGEST) partial_len; + return TARGET_XFER_OK; + } + + default: + return TARGET_XFER_E_IO; + } +} + +/* Wait for the child specified by PTID to do something. Return the + process ID of the child, or MINUS_ONE_PTID in case of error; store + the status in *OURSTATUS. */ + +ptid_t +rs6000_nat_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus, + target_wait_flags options) +{ + pid_t pid; + int status, save_errno; + + do + { + set_sigint_trap (); + + do + { + pid = waitpid (ptid.pid (), &status, 0); + save_errno = errno; + } + while (pid == -1 && errno == EINTR); + + clear_sigint_trap (); + + if (pid == -1) + { + fprintf_unfiltered (gdb_stderr, + _("Child process unexpectedly missing: %s.\n"), + safe_strerror (save_errno)); + + /* Claim it exited with unknown signal. */ + ourstatus->set_signalled (GDB_SIGNAL_UNKNOWN); + return inferior_ptid; + } + + /* Ignore terminated detached child processes. */ + if (!WIFSTOPPED (status) && pid != inferior_ptid.pid ()) + pid = -1; + } + while (pid == -1); + + /* AIX has a couple of strange returns from wait(). */ + + /* stop after load" status. */ + if (status == 0x57c) + ourstatus->set_loaded (); + /* signal 0. I have no idea why wait(2) returns with this status word. */ + else if (status == 0x7f) + ourstatus->set_spurious (); + /* A normal waitstatus. Let the usual macros deal with it. */ + else + store_waitstatus (ourstatus, status); + + return ptid_t (pid); +} + + +/* Set the current architecture from the host running GDB. Called when + starting a child process. */ + +void +rs6000_nat_target::create_inferior (const char *exec_file, + const std::string &allargs, + char **env, int from_tty) +{ + enum bfd_architecture arch; + unsigned long mach; + bfd abfd; + + inf_ptrace_target::create_inferior (exec_file, allargs, env, from_tty); + + if (__power_rs ()) + { + arch = bfd_arch_rs6000; + mach = bfd_mach_rs6k; + } + else + { + arch = bfd_arch_powerpc; + mach = bfd_mach_ppc; + } + + /* FIXME: schauer/2002-02-25: + We don't know if we are executing a 32 or 64 bit executable, + and have no way to pass the proper word size to rs6000_gdbarch_init. + So we have to avoid switching to a new architecture, if the architecture + matches already. + Blindly calling rs6000_gdbarch_init used to work in older versions of + GDB, as rs6000_gdbarch_init incorrectly used the previous tdep to + determine the wordsize. */ + if (current_program_space->exec_bfd ()) + { + const struct bfd_arch_info *exec_bfd_arch_info; + + exec_bfd_arch_info + = bfd_get_arch_info (current_program_space->exec_bfd ()); + if (arch == exec_bfd_arch_info->arch) + return; + } + + bfd_default_set_arch_mach (&abfd, arch, mach); + + gdbarch_info info; + info.bfd_arch_info = bfd_get_arch_info (&abfd); + info.abfd = current_program_space->exec_bfd (); + + if (!gdbarch_update_p (info)) + internal_error (__FILE__, __LINE__, + _("rs6000_create_inferior: failed " + "to select architecture")); +} + + +/* Shared Object support. */ + +/* Return the LdInfo data for the given process. Raises an error + if the data could not be obtained. */ + +static gdb::byte_vector +rs6000_ptrace_ldinfo (ptid_t ptid) +{ + const int pid = ptid.pid (); + gdb::byte_vector ldi (1024); + int rc = -1; + + while (1) + { + if (ARCH64 ()) + rc = rs6000_ptrace64 (PT_LDINFO, pid, (unsigned long) ldi.data (), + ldi.size (), NULL); + else + rc = rs6000_ptrace32 (PT_LDINFO, pid, (int *) ldi.data (), + ldi.size (), NULL); + + if (rc != -1) + break; /* Success, we got the entire ld_info data. */ + + if (errno != ENOMEM) + perror_with_name (_("ptrace ldinfo")); + + /* ldi is not big enough. Double it and try again. */ + ldi.resize (ldi.size () * 2); + } + + return ldi; +} + +/* Implement the to_xfer_partial target_ops method for + TARGET_OBJECT_LIBRARIES_AIX objects. */ + +enum target_xfer_status +rs6000_nat_target::xfer_shared_libraries + (enum target_object object, + const char *annex, gdb_byte *readbuf, const gdb_byte *writebuf, + ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) +{ + ULONGEST result; + + /* This function assumes that it is being run with a live process. + Core files are handled via gdbarch. */ + gdb_assert (target_has_execution ()); + + if (writebuf) + return TARGET_XFER_E_IO; + + gdb::byte_vector ldi_buf = rs6000_ptrace_ldinfo (inferior_ptid); + result = rs6000_aix_ld_info_to_xml (target_gdbarch (), ldi_buf.data (), + readbuf, offset, len, 1); + + if (result == 0) + return TARGET_XFER_EOF; + else + { + *xfered_len = result; + return TARGET_XFER_OK; + } +} + +void _initialize_rs6000_nat (); +void +_initialize_rs6000_nat () +{ + add_inf_child_target (&the_rs6000_nat_target); +} diff --git a/gdb/rs6000-nat.c b/gdb/rs6000-nat.c deleted file mode 100644 index c266c50777f..00000000000 --- a/gdb/rs6000-nat.c +++ /dev/null @@ -1,675 +0,0 @@ -/* IBM RS/6000 native-dependent code for GDB, the GNU debugger. - - Copyright (C) 1986-2021 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 3 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, see . */ - -#include "defs.h" -#include "inferior.h" -#include "target.h" -#include "gdbcore.h" -#include "symfile.h" -#include "objfiles.h" -#include "bfd.h" -#include "gdb-stabs.h" -#include "regcache.h" -#include "arch-utils.h" -#include "inf-child.h" -#include "inf-ptrace.h" -#include "ppc-tdep.h" -#include "rs6000-tdep.h" -#include "rs6000-aix-tdep.h" -#include "exec.h" -#include "observable.h" -#include "xcoffread.h" - -#include -#include - -#include -#include -#include -#include -#include - -#include -#include -#include -#include "gdb_bfd.h" -#include -#define __LDINFO_PTRACE32__ /* for __ld_info32 */ -#define __LDINFO_PTRACE64__ /* for __ld_info64 */ -#include -#include - -/* On AIX4.3+, sys/ldr.h provides different versions of struct ld_info for - debugging 32-bit and 64-bit processes. Define a typedef and macros for - accessing fields in the appropriate structures. */ - -/* In 32-bit compilation mode (which is the only mode from which ptrace() - works on 4.3), __ld_info32 is #defined as equivalent to ld_info. */ - -#if defined (__ld_info32) || defined (__ld_info64) -# define ARCH3264 -#endif - -/* Return whether the current architecture is 64-bit. */ - -#ifndef ARCH3264 -# define ARCH64() 0 -#else -# define ARCH64() (register_size (target_gdbarch (), 0) == 8) -#endif - -class rs6000_nat_target final : public inf_ptrace_target -{ -public: - void fetch_registers (struct regcache *, int) override; - void store_registers (struct regcache *, int) override; - - enum target_xfer_status xfer_partial (enum target_object object, - const char *annex, - gdb_byte *readbuf, - const gdb_byte *writebuf, - ULONGEST offset, ULONGEST len, - ULONGEST *xfered_len) override; - - void create_inferior (const char *, const std::string &, - char **, int) override; - - ptid_t wait (ptid_t, struct target_waitstatus *, target_wait_flags) override; - -private: - enum target_xfer_status - xfer_shared_libraries (enum target_object object, - const char *annex, gdb_byte *readbuf, - const gdb_byte *writebuf, - ULONGEST offset, ULONGEST len, - ULONGEST *xfered_len); -}; - -static rs6000_nat_target the_rs6000_nat_target; - -/* Given REGNO, a gdb register number, return the corresponding - number suitable for use as a ptrace() parameter. Return -1 if - there's no suitable mapping. Also, set the int pointed to by - ISFLOAT to indicate whether REGNO is a floating point register. */ - -static int -regmap (struct gdbarch *gdbarch, int regno, int *isfloat) -{ - ppc_gdbarch_tdep *tdep = (ppc_gdbarch_tdep *) gdbarch_tdep (gdbarch); - - *isfloat = 0; - if (tdep->ppc_gp0_regnum <= regno - && regno < tdep->ppc_gp0_regnum + ppc_num_gprs) - return regno; - else if (tdep->ppc_fp0_regnum >= 0 - && tdep->ppc_fp0_regnum <= regno - && regno < tdep->ppc_fp0_regnum + ppc_num_fprs) - { - *isfloat = 1; - return regno - tdep->ppc_fp0_regnum + FPR0; - } - else if (regno == gdbarch_pc_regnum (gdbarch)) - return IAR; - else if (regno == tdep->ppc_ps_regnum) - return MSR; - else if (regno == tdep->ppc_cr_regnum) - return CR; - else if (regno == tdep->ppc_lr_regnum) - return LR; - else if (regno == tdep->ppc_ctr_regnum) - return CTR; - else if (regno == tdep->ppc_xer_regnum) - return XER; - else if (tdep->ppc_fpscr_regnum >= 0 - && regno == tdep->ppc_fpscr_regnum) - return FPSCR; - else if (tdep->ppc_mq_regnum >= 0 && regno == tdep->ppc_mq_regnum) - return MQ; - else - return -1; -} - -/* Call ptrace(REQ, ID, ADDR, DATA, BUF). */ - -static int -rs6000_ptrace32 (int req, int id, int *addr, int data, int *buf) -{ -#ifdef HAVE_PTRACE64 - int ret = ptrace64 (req, id, (uintptr_t) addr, data, buf); -#else - int ret = ptrace (req, id, (int *)addr, data, buf); -#endif -#if 0 - printf ("rs6000_ptrace32 (%d, %d, 0x%x, %08x, 0x%x) = 0x%x\n", - req, id, (unsigned int)addr, data, (unsigned int)buf, ret); -#endif - return ret; -} - -/* Call ptracex(REQ, ID, ADDR, DATA, BUF). */ - -static int -rs6000_ptrace64 (int req, int id, long long addr, int data, void *buf) -{ -#ifdef ARCH3264 -# ifdef HAVE_PTRACE64 - int ret = ptrace64 (req, id, addr, data, (PTRACE_TYPE_ARG5) buf); -# else - int ret = ptracex (req, id, addr, data, (PTRACE_TYPE_ARG5) buf); -# endif -#else - int ret = 0; -#endif -#if 0 - printf ("rs6000_ptrace64 (%d, %d, %s, %08x, 0x%x) = 0x%x\n", - req, id, hex_string (addr), data, (unsigned int)buf, ret); -#endif - return ret; -} - -/* Fetch register REGNO from the inferior. */ - -static void -fetch_register (struct regcache *regcache, int regno) -{ - struct gdbarch *gdbarch = regcache->arch (); - int addr[PPC_MAX_REGISTER_SIZE]; - int nr, isfloat; - pid_t pid = regcache->ptid ().pid (); - - /* Retrieved values may be -1, so infer errors from errno. */ - errno = 0; - - nr = regmap (gdbarch, regno, &isfloat); - - /* Floating-point registers. */ - if (isfloat) - rs6000_ptrace32 (PT_READ_FPR, pid, addr, nr, 0); - - /* Bogus register number. */ - else if (nr < 0) - { - if (regno >= gdbarch_num_regs (gdbarch)) - fprintf_unfiltered (gdb_stderr, - "gdb error: register no %d not implemented.\n", - regno); - return; - } - - /* Fixed-point registers. */ - else - { - if (!ARCH64 ()) - *addr = rs6000_ptrace32 (PT_READ_GPR, pid, (int *) nr, 0, 0); - else - { - /* PT_READ_GPR requires the buffer parameter to point to long long, - even if the register is really only 32 bits. */ - long long buf; - rs6000_ptrace64 (PT_READ_GPR, pid, nr, 0, &buf); - if (register_size (gdbarch, regno) == 8) - memcpy (addr, &buf, 8); - else - *addr = buf; - } - } - - if (!errno) - regcache->raw_supply (regno, (char *) addr); - else - { -#if 0 - /* FIXME: this happens 3 times at the start of each 64-bit program. */ - perror (_("ptrace read")); -#endif - errno = 0; - } -} - -/* Store register REGNO back into the inferior. */ - -static void -store_register (struct regcache *regcache, int regno) -{ - struct gdbarch *gdbarch = regcache->arch (); - int addr[PPC_MAX_REGISTER_SIZE]; - int nr, isfloat; - pid_t pid = regcache->ptid ().pid (); - - /* Fetch the register's value from the register cache. */ - regcache->raw_collect (regno, addr); - - /* -1 can be a successful return value, so infer errors from errno. */ - errno = 0; - - nr = regmap (gdbarch, regno, &isfloat); - - /* Floating-point registers. */ - if (isfloat) - rs6000_ptrace32 (PT_WRITE_FPR, pid, addr, nr, 0); - - /* Bogus register number. */ - else if (nr < 0) - { - if (regno >= gdbarch_num_regs (gdbarch)) - fprintf_unfiltered (gdb_stderr, - "gdb error: register no %d not implemented.\n", - regno); - } - - /* Fixed-point registers. */ - else - { - /* The PT_WRITE_GPR operation is rather odd. For 32-bit inferiors, - the register's value is passed by value, but for 64-bit inferiors, - the address of a buffer containing the value is passed. */ - if (!ARCH64 ()) - rs6000_ptrace32 (PT_WRITE_GPR, pid, (int *) nr, *addr, 0); - else - { - /* PT_WRITE_GPR requires the buffer parameter to point to an 8-byte - area, even if the register is really only 32 bits. */ - long long buf; - if (register_size (gdbarch, regno) == 8) - memcpy (&buf, addr, 8); - else - buf = *addr; - rs6000_ptrace64 (PT_WRITE_GPR, pid, nr, 0, &buf); - } - } - - if (errno) - { - perror (_("ptrace write")); - errno = 0; - } -} - -/* Read from the inferior all registers if REGNO == -1 and just register - REGNO otherwise. */ - -void -rs6000_nat_target::fetch_registers (struct regcache *regcache, int regno) -{ - struct gdbarch *gdbarch = regcache->arch (); - if (regno != -1) - fetch_register (regcache, regno); - - else - { - ppc_gdbarch_tdep *tdep = (ppc_gdbarch_tdep *) gdbarch_tdep (gdbarch); - - /* Read 32 general purpose registers. */ - for (regno = tdep->ppc_gp0_regnum; - regno < tdep->ppc_gp0_regnum + ppc_num_gprs; - regno++) - { - fetch_register (regcache, regno); - } - - /* Read general purpose floating point registers. */ - if (tdep->ppc_fp0_regnum >= 0) - for (regno = 0; regno < ppc_num_fprs; regno++) - fetch_register (regcache, tdep->ppc_fp0_regnum + regno); - - /* Read special registers. */ - fetch_register (regcache, gdbarch_pc_regnum (gdbarch)); - fetch_register (regcache, tdep->ppc_ps_regnum); - fetch_register (regcache, tdep->ppc_cr_regnum); - fetch_register (regcache, tdep->ppc_lr_regnum); - fetch_register (regcache, tdep->ppc_ctr_regnum); - fetch_register (regcache, tdep->ppc_xer_regnum); - if (tdep->ppc_fpscr_regnum >= 0) - fetch_register (regcache, tdep->ppc_fpscr_regnum); - if (tdep->ppc_mq_regnum >= 0) - fetch_register (regcache, tdep->ppc_mq_regnum); - } -} - -/* 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 -rs6000_nat_target::store_registers (struct regcache *regcache, int regno) -{ - struct gdbarch *gdbarch = regcache->arch (); - if (regno != -1) - store_register (regcache, regno); - - else - { - ppc_gdbarch_tdep *tdep = (ppc_gdbarch_tdep *) gdbarch_tdep (gdbarch); - - /* Write general purpose registers first. */ - for (regno = tdep->ppc_gp0_regnum; - regno < tdep->ppc_gp0_regnum + ppc_num_gprs; - regno++) - { - store_register (regcache, regno); - } - - /* Write floating point registers. */ - if (tdep->ppc_fp0_regnum >= 0) - for (regno = 0; regno < ppc_num_fprs; regno++) - store_register (regcache, tdep->ppc_fp0_regnum + regno); - - /* Write special registers. */ - store_register (regcache, gdbarch_pc_regnum (gdbarch)); - store_register (regcache, tdep->ppc_ps_regnum); - store_register (regcache, tdep->ppc_cr_regnum); - store_register (regcache, tdep->ppc_lr_regnum); - store_register (regcache, tdep->ppc_ctr_regnum); - store_register (regcache, tdep->ppc_xer_regnum); - if (tdep->ppc_fpscr_regnum >= 0) - store_register (regcache, tdep->ppc_fpscr_regnum); - if (tdep->ppc_mq_regnum >= 0) - store_register (regcache, tdep->ppc_mq_regnum); - } -} - -/* Implement the to_xfer_partial target_ops method. */ - -enum target_xfer_status -rs6000_nat_target::xfer_partial (enum target_object object, - const char *annex, gdb_byte *readbuf, - const gdb_byte *writebuf, - ULONGEST offset, ULONGEST len, - ULONGEST *xfered_len) -{ - pid_t pid = inferior_ptid.pid (); - int arch64 = ARCH64 (); - - switch (object) - { - case TARGET_OBJECT_LIBRARIES_AIX: - return xfer_shared_libraries (object, annex, - readbuf, writebuf, - offset, len, xfered_len); - case TARGET_OBJECT_MEMORY: - { - union - { - PTRACE_TYPE_RET word; - gdb_byte byte[sizeof (PTRACE_TYPE_RET)]; - } buffer; - ULONGEST rounded_offset; - LONGEST partial_len; - - /* Round the start offset down to the next long word - boundary. */ - rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET); - - /* Since ptrace will transfer a single word starting at that - rounded_offset the partial_len needs to be adjusted down to - that (remember this function only does a single transfer). - Should the required length be even less, adjust it down - again. */ - partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset; - if (partial_len > len) - partial_len = len; - - if (writebuf) - { - /* If OFFSET:PARTIAL_LEN is smaller than - ROUNDED_OFFSET:WORDSIZE then a read/modify write will - be needed. Read in the entire word. */ - if (rounded_offset < offset - || (offset + partial_len - < rounded_offset + sizeof (PTRACE_TYPE_RET))) - { - /* Need part of initial word -- fetch it. */ - if (arch64) - buffer.word = rs6000_ptrace64 (PT_READ_I, pid, - rounded_offset, 0, NULL); - else - buffer.word = rs6000_ptrace32 (PT_READ_I, pid, - (int *) (uintptr_t) - rounded_offset, - 0, NULL); - } - - /* Copy data to be written over corresponding part of - buffer. */ - memcpy (buffer.byte + (offset - rounded_offset), - writebuf, partial_len); - - errno = 0; - if (arch64) - rs6000_ptrace64 (PT_WRITE_D, pid, - rounded_offset, buffer.word, NULL); - else - rs6000_ptrace32 (PT_WRITE_D, pid, - (int *) (uintptr_t) rounded_offset, - buffer.word, NULL); - if (errno) - return TARGET_XFER_EOF; - } - - if (readbuf) - { - errno = 0; - if (arch64) - buffer.word = rs6000_ptrace64 (PT_READ_I, pid, - rounded_offset, 0, NULL); - else - buffer.word = rs6000_ptrace32 (PT_READ_I, pid, - (int *)(uintptr_t)rounded_offset, - 0, NULL); - if (errno) - return TARGET_XFER_EOF; - - /* Copy appropriate bytes out of the buffer. */ - memcpy (readbuf, buffer.byte + (offset - rounded_offset), - partial_len); - } - - *xfered_len = (ULONGEST) partial_len; - return TARGET_XFER_OK; - } - - default: - return TARGET_XFER_E_IO; - } -} - -/* Wait for the child specified by PTID to do something. Return the - process ID of the child, or MINUS_ONE_PTID in case of error; store - the status in *OURSTATUS. */ - -ptid_t -rs6000_nat_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus, - target_wait_flags options) -{ - pid_t pid; - int status, save_errno; - - do - { - set_sigint_trap (); - - do - { - pid = waitpid (ptid.pid (), &status, 0); - save_errno = errno; - } - while (pid == -1 && errno == EINTR); - - clear_sigint_trap (); - - if (pid == -1) - { - fprintf_unfiltered (gdb_stderr, - _("Child process unexpectedly missing: %s.\n"), - safe_strerror (save_errno)); - - /* Claim it exited with unknown signal. */ - ourstatus->set_signalled (GDB_SIGNAL_UNKNOWN); - return inferior_ptid; - } - - /* Ignore terminated detached child processes. */ - if (!WIFSTOPPED (status) && pid != inferior_ptid.pid ()) - pid = -1; - } - while (pid == -1); - - /* AIX has a couple of strange returns from wait(). */ - - /* stop after load" status. */ - if (status == 0x57c) - ourstatus->set_loaded (); - /* signal 0. I have no idea why wait(2) returns with this status word. */ - else if (status == 0x7f) - ourstatus->set_spurious (); - /* A normal waitstatus. Let the usual macros deal with it. */ - else - store_waitstatus (ourstatus, status); - - return ptid_t (pid); -} - - -/* Set the current architecture from the host running GDB. Called when - starting a child process. */ - -void -rs6000_nat_target::create_inferior (const char *exec_file, - const std::string &allargs, - char **env, int from_tty) -{ - enum bfd_architecture arch; - unsigned long mach; - bfd abfd; - - inf_ptrace_target::create_inferior (exec_file, allargs, env, from_tty); - - if (__power_rs ()) - { - arch = bfd_arch_rs6000; - mach = bfd_mach_rs6k; - } - else - { - arch = bfd_arch_powerpc; - mach = bfd_mach_ppc; - } - - /* FIXME: schauer/2002-02-25: - We don't know if we are executing a 32 or 64 bit executable, - and have no way to pass the proper word size to rs6000_gdbarch_init. - So we have to avoid switching to a new architecture, if the architecture - matches already. - Blindly calling rs6000_gdbarch_init used to work in older versions of - GDB, as rs6000_gdbarch_init incorrectly used the previous tdep to - determine the wordsize. */ - if (current_program_space->exec_bfd ()) - { - const struct bfd_arch_info *exec_bfd_arch_info; - - exec_bfd_arch_info - = bfd_get_arch_info (current_program_space->exec_bfd ()); - if (arch == exec_bfd_arch_info->arch) - return; - } - - bfd_default_set_arch_mach (&abfd, arch, mach); - - gdbarch_info info; - info.bfd_arch_info = bfd_get_arch_info (&abfd); - info.abfd = current_program_space->exec_bfd (); - - if (!gdbarch_update_p (info)) - internal_error (__FILE__, __LINE__, - _("rs6000_create_inferior: failed " - "to select architecture")); -} - - -/* Shared Object support. */ - -/* Return the LdInfo data for the given process. Raises an error - if the data could not be obtained. */ - -static gdb::byte_vector -rs6000_ptrace_ldinfo (ptid_t ptid) -{ - const int pid = ptid.pid (); - gdb::byte_vector ldi (1024); - int rc = -1; - - while (1) - { - if (ARCH64 ()) - rc = rs6000_ptrace64 (PT_LDINFO, pid, (unsigned long) ldi.data (), - ldi.size (), NULL); - else - rc = rs6000_ptrace32 (PT_LDINFO, pid, (int *) ldi.data (), - ldi.size (), NULL); - - if (rc != -1) - break; /* Success, we got the entire ld_info data. */ - - if (errno != ENOMEM) - perror_with_name (_("ptrace ldinfo")); - - /* ldi is not big enough. Double it and try again. */ - ldi.resize (ldi.size () * 2); - } - - return ldi; -} - -/* Implement the to_xfer_partial target_ops method for - TARGET_OBJECT_LIBRARIES_AIX objects. */ - -enum target_xfer_status -rs6000_nat_target::xfer_shared_libraries - (enum target_object object, - const char *annex, gdb_byte *readbuf, const gdb_byte *writebuf, - ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) -{ - ULONGEST result; - - /* This function assumes that it is being run with a live process. - Core files are handled via gdbarch. */ - gdb_assert (target_has_execution ()); - - if (writebuf) - return TARGET_XFER_E_IO; - - gdb::byte_vector ldi_buf = rs6000_ptrace_ldinfo (inferior_ptid); - result = rs6000_aix_ld_info_to_xml (target_gdbarch (), ldi_buf.data (), - readbuf, offset, len, 1); - - if (result == 0) - return TARGET_XFER_EOF; - else - { - *xfered_len = result; - return TARGET_XFER_OK; - } -} - -void _initialize_rs6000_nat (); -void -_initialize_rs6000_nat () -{ - add_inf_child_target (&the_rs6000_nat_target); -}