| /* Native-dependent code for SPARC. |
| |
| Copyright (C) 2003-2021 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 <http://www.gnu.org/licenses/>. */ |
| |
| #include "defs.h" |
| #include "inferior.h" |
| #include "regcache.h" |
| #include "target.h" |
| |
| #include <signal.h> |
| #include <sys/ptrace.h> |
| #include "gdbsupport/gdb_wait.h" |
| #ifdef HAVE_MACHINE_REG_H |
| #include <machine/reg.h> |
| #endif |
| |
| #include "sparc-tdep.h" |
| #include "sparc-nat.h" |
| #include "inf-ptrace.h" |
| |
| /* With some trickery we can use the code in this file for most (if |
| not all) ptrace(2) based SPARC systems, which includes SunOS 4, |
| GNU/Linux and the various SPARC BSD's. |
| |
| First, we need a data structure for use with ptrace(2). SunOS has |
| `struct regs' and `struct fp_status' in <machine/reg.h>. BSD's |
| have `struct reg' and `struct fpreg' in <machine/reg.h>. GNU/Linux |
| has the same structures as SunOS 4, but they're in <asm/reg.h>, |
| which is a kernel header. As a general rule we avoid including |
| GNU/Linux kernel headers. Fortunately GNU/Linux has a `gregset_t' |
| and a `fpregset_t' that are equivalent to `struct regs' and `struct |
| fp_status' in <sys/ucontext.h>, which is automatically included by |
| <signal.h>. Settling on using the `gregset_t' and `fpregset_t' |
| typedefs, providing them for the other systems, therefore solves |
| the puzzle. */ |
| |
| #ifdef HAVE_MACHINE_REG_H |
| #ifdef HAVE_STRUCT_REG |
| typedef struct reg gregset_t; |
| typedef struct fpreg fpregset_t; |
| #else |
| typedef struct regs gregset_t; |
| typedef struct fp_status fpregset_t; |
| #endif |
| #endif |
| |
| /* Second, we need to remap the BSD ptrace(2) requests to their SunOS |
| equivalents. GNU/Linux already follows SunOS here. */ |
| |
| #ifndef PTRACE_GETREGS |
| #define PTRACE_GETREGS PT_GETREGS |
| #endif |
| |
| #ifndef PTRACE_SETREGS |
| #define PTRACE_SETREGS PT_SETREGS |
| #endif |
| |
| #ifndef PTRACE_GETFPREGS |
| #define PTRACE_GETFPREGS PT_GETFPREGS |
| #endif |
| |
| #ifndef PTRACE_SETFPREGS |
| #define PTRACE_SETFPREGS PT_SETFPREGS |
| #endif |
| |
| static PTRACE_TYPE_RET |
| gdb_ptrace (PTRACE_TYPE_ARG1 request, ptid_t ptid, PTRACE_TYPE_ARG3 addr) |
| { |
| #ifdef __NetBSD__ |
| /* Support for NetBSD threads: unlike other ptrace implementations in this |
| file, NetBSD requires that we pass both the pid and lwp. */ |
| return ptrace (request, ptid.pid (), addr, ptid.lwp ()); |
| #else |
| pid_t pid = get_ptrace_pid (ptid); |
| return ptrace (request, pid, addr, 0); |
| #endif |
| } |
| |
| /* Register set description. */ |
| const struct sparc_gregmap *sparc_gregmap; |
| const struct sparc_fpregmap *sparc_fpregmap; |
| void (*sparc_supply_gregset) (const struct sparc_gregmap *, |
| struct regcache *, int , const void *); |
| void (*sparc_collect_gregset) (const struct sparc_gregmap *, |
| const struct regcache *, int, void *); |
| void (*sparc_supply_fpregset) (const struct sparc_fpregmap *, |
| struct regcache *, int , const void *); |
| void (*sparc_collect_fpregset) (const struct sparc_fpregmap *, |
| const struct regcache *, int , void *); |
| int (*sparc_gregset_supplies_p) (struct gdbarch *, int); |
| int (*sparc_fpregset_supplies_p) (struct gdbarch *, int); |
| |
| /* Determine whether `gregset_t' contains register REGNUM. */ |
| |
| int |
| sparc32_gregset_supplies_p (struct gdbarch *gdbarch, int regnum) |
| { |
| /* Integer registers. */ |
| if ((regnum >= SPARC_G1_REGNUM && regnum <= SPARC_G7_REGNUM) |
| || (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM) |
| || (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_L7_REGNUM) |
| || (regnum >= SPARC_I0_REGNUM && regnum <= SPARC_I7_REGNUM)) |
| return 1; |
| |
| /* Control registers. */ |
| if (regnum == SPARC32_PC_REGNUM |
| || regnum == SPARC32_NPC_REGNUM |
| || regnum == SPARC32_PSR_REGNUM |
| || regnum == SPARC32_Y_REGNUM) |
| return 1; |
| |
| return 0; |
| } |
| |
| /* Determine whether `fpregset_t' contains register REGNUM. */ |
| |
| int |
| sparc32_fpregset_supplies_p (struct gdbarch *gdbarch, int regnum) |
| { |
| /* Floating-point registers. */ |
| if (regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F31_REGNUM) |
| return 1; |
| |
| /* Control registers. */ |
| if (regnum == SPARC32_FSR_REGNUM) |
| return 1; |
| |
| return 0; |
| } |
| |
| /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this |
| for all registers (including the floating-point registers). */ |
| |
| void |
| sparc_fetch_inferior_registers (process_stratum_target *proc_target, |
| regcache *regcache, int regnum) |
| { |
| struct gdbarch *gdbarch = regcache->arch (); |
| ptid_t ptid = regcache->ptid (); |
| |
| if (regnum == SPARC_G0_REGNUM) |
| { |
| gdb_byte zero[8] = { 0 }; |
| |
| regcache->raw_supply (SPARC_G0_REGNUM, &zero); |
| return; |
| } |
| |
| if (regnum == -1 || sparc_gregset_supplies_p (gdbarch, regnum)) |
| { |
| gregset_t regs; |
| |
| if (gdb_ptrace (PTRACE_GETREGS, ptid, (PTRACE_TYPE_ARG3) ®s) == -1) |
| perror_with_name (_("Couldn't get registers")); |
| |
| /* Deep down, sparc_supply_rwindow reads memory, so needs the global |
| thread context to be set. */ |
| scoped_restore restore_inferior_ptid |
| = make_scoped_restore (&inferior_ptid, ptid); |
| |
| sparc_supply_gregset (sparc_gregmap, regcache, -1, ®s); |
| if (regnum != -1) |
| return; |
| } |
| |
| if (regnum == -1 || sparc_fpregset_supplies_p (gdbarch, regnum)) |
| { |
| fpregset_t fpregs; |
| |
| if (gdb_ptrace (PTRACE_GETFPREGS, ptid, (PTRACE_TYPE_ARG3) &fpregs) == -1) |
| perror_with_name (_("Couldn't get floating point status")); |
| |
| sparc_supply_fpregset (sparc_fpregmap, regcache, -1, &fpregs); |
| } |
| } |
| |
| void |
| sparc_store_inferior_registers (process_stratum_target *proc_target, |
| regcache *regcache, int regnum) |
| { |
| struct gdbarch *gdbarch = regcache->arch (); |
| ptid_t ptid = regcache->ptid (); |
| |
| if (regnum == -1 || sparc_gregset_supplies_p (gdbarch, regnum)) |
| { |
| gregset_t regs; |
| |
| if (gdb_ptrace (PTRACE_GETREGS, ptid, (PTRACE_TYPE_ARG3) ®s) == -1) |
| perror_with_name (_("Couldn't get registers")); |
| |
| sparc_collect_gregset (sparc_gregmap, regcache, regnum, ®s); |
| |
| if (gdb_ptrace (PTRACE_SETREGS, ptid, (PTRACE_TYPE_ARG3) ®s) == -1) |
| perror_with_name (_("Couldn't write registers")); |
| |
| /* Deal with the stack regs. */ |
| if (regnum == -1 || regnum == SPARC_SP_REGNUM |
| || (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_I7_REGNUM)) |
| { |
| ULONGEST sp; |
| |
| regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM, &sp); |
| |
| /* Deep down, sparc_collect_rwindow writes memory, so needs the global |
| thread context to be set. */ |
| scoped_restore restore_inferior_ptid |
| = make_scoped_restore (&inferior_ptid, ptid); |
| |
| sparc_collect_rwindow (regcache, sp, regnum); |
| } |
| |
| if (regnum != -1) |
| return; |
| } |
| |
| if (regnum == -1 || sparc_fpregset_supplies_p (gdbarch, regnum)) |
| { |
| fpregset_t fpregs, saved_fpregs; |
| |
| if (gdb_ptrace (PTRACE_GETFPREGS, ptid, (PTRACE_TYPE_ARG3) &fpregs) == -1) |
| perror_with_name (_("Couldn't get floating-point registers")); |
| |
| memcpy (&saved_fpregs, &fpregs, sizeof (fpregs)); |
| sparc_collect_fpregset (sparc_fpregmap, regcache, regnum, &fpregs); |
| |
| /* Writing the floating-point registers will fail on NetBSD with |
| EINVAL if the inferior process doesn't have an FPU state |
| (i.e. if it didn't use the FPU yet). Therefore we don't try |
| to write the registers if nothing changed. */ |
| if (memcmp (&saved_fpregs, &fpregs, sizeof (fpregs)) != 0) |
| { |
| if (gdb_ptrace (PTRACE_SETFPREGS, ptid, |
| (PTRACE_TYPE_ARG3) &fpregs) == -1) |
| perror_with_name (_("Couldn't write floating-point registers")); |
| } |
| |
| if (regnum != -1) |
| return; |
| } |
| } |
| |
| |
| /* Implement the to_xfer_partial target_ops method for |
| TARGET_OBJECT_WCOOKIE. Fetch StackGhost Per-Process XOR cookie. */ |
| |
| enum target_xfer_status |
| sparc_xfer_wcookie (enum target_object object, |
| const char *annex, gdb_byte *readbuf, |
| const gdb_byte *writebuf, ULONGEST offset, ULONGEST len, |
| ULONGEST *xfered_len) |
| { |
| unsigned long wcookie = 0; |
| char *buf = (char *)&wcookie; |
| |
| gdb_assert (object == TARGET_OBJECT_WCOOKIE); |
| gdb_assert (readbuf && writebuf == NULL); |
| |
| if (offset == sizeof (unsigned long)) |
| return TARGET_XFER_EOF; /* Signal EOF. */ |
| if (offset > sizeof (unsigned long)) |
| return TARGET_XFER_E_IO; |
| |
| #ifdef PT_WCOOKIE |
| /* If PT_WCOOKIE is defined (by <sys/ptrace.h>), assume we're |
| running on an OpenBSD release that uses StackGhost (3.1 or |
| later). Since release 3.6, OpenBSD uses a fully randomized |
| cookie. */ |
| { |
| int pid = inferior_ptid.pid (); |
| |
| /* Sanity check. The proper type for a cookie is register_t, but |
| we can't assume that this type exists on all systems supported |
| by the code in this file. */ |
| gdb_assert (sizeof (wcookie) == sizeof (register_t)); |
| |
| /* Fetch the cookie. */ |
| if (ptrace (PT_WCOOKIE, pid, (PTRACE_TYPE_ARG3) &wcookie, 0) == -1) |
| { |
| if (errno != EINVAL) |
| perror_with_name (_("Couldn't get StackGhost cookie")); |
| |
| /* Although PT_WCOOKIE is defined on OpenBSD 3.1 and later, |
| the request wasn't implemented until after OpenBSD 3.4. If |
| the kernel doesn't support the PT_WCOOKIE request, assume |
| we're running on a kernel that uses non-randomized cookies. */ |
| wcookie = 0x3; |
| } |
| } |
| #endif /* PT_WCOOKIE */ |
| |
| if (len > sizeof (unsigned long) - offset) |
| len = sizeof (unsigned long) - offset; |
| |
| memcpy (readbuf, buf + offset, len); |
| *xfered_len = (ULONGEST) len; |
| return TARGET_XFER_OK; |
| } |
| |
| |
| void _initialize_sparc_nat (); |
| void |
| _initialize_sparc_nat () |
| { |
| /* Default to using SunOS 4 register sets. */ |
| if (sparc_gregmap == NULL) |
| sparc_gregmap = &sparc32_sunos4_gregmap; |
| if (sparc_fpregmap == NULL) |
| sparc_fpregmap = &sparc32_sunos4_fpregmap; |
| if (sparc_supply_gregset == NULL) |
| sparc_supply_gregset = sparc32_supply_gregset; |
| if (sparc_collect_gregset == NULL) |
| sparc_collect_gregset = sparc32_collect_gregset; |
| if (sparc_supply_fpregset == NULL) |
| sparc_supply_fpregset = sparc32_supply_fpregset; |
| if (sparc_collect_fpregset == NULL) |
| sparc_collect_fpregset = sparc32_collect_fpregset; |
| if (sparc_gregset_supplies_p == NULL) |
| sparc_gregset_supplies_p = sparc32_gregset_supplies_p; |
| if (sparc_fpregset_supplies_p == NULL) |
| sparc_fpregset_supplies_p = sparc32_fpregset_supplies_p; |
| } |