/* GNU/Linux/MIPS specific low level interface, for the remote server for GDB. Copyright (C) 1995-2024 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 "linux-low.h" #include "nat/gdb_ptrace.h" #include #include "nat/mips-linux-watch.h" #include "gdb_proc_service.h" /* Linux target op definitions for the MIPS architecture. */ class mips_target : public linux_process_target { public: const regs_info *get_regs_info () override; const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override; bool supports_z_point_type (char z_type) override; protected: void low_arch_setup () override; bool low_cannot_fetch_register (int regno) override; bool low_cannot_store_register (int regno) override; bool low_fetch_register (regcache *regcache, int regno) override; bool low_supports_breakpoints () override; CORE_ADDR low_get_pc (regcache *regcache) override; void low_set_pc (regcache *regcache, CORE_ADDR newpc) override; bool low_breakpoint_at (CORE_ADDR pc) override; int low_insert_point (raw_bkpt_type type, CORE_ADDR addr, int size, raw_breakpoint *bp) override; int low_remove_point (raw_bkpt_type type, CORE_ADDR addr, int size, raw_breakpoint *bp) override; bool low_stopped_by_watchpoint () override; CORE_ADDR low_stopped_data_address () override; void low_collect_ptrace_register (regcache *regcache, int regno, char *buf) override; void low_supply_ptrace_register (regcache *regcache, int regno, const char *buf) override; arch_process_info *low_new_process () override; void low_delete_process (arch_process_info *info) override; void low_new_thread (lwp_info *) override; void low_delete_thread (arch_lwp_info *) override; void low_new_fork (process_info *parent, process_info *child) override; void low_prepare_to_resume (lwp_info *lwp) override; }; /* The singleton target ops object. */ static mips_target the_mips_target; /* Defined in auto-generated file mips-linux.c. */ void init_registers_mips_linux (void); extern const struct target_desc *tdesc_mips_linux; /* Defined in auto-generated file mips-dsp-linux.c. */ void init_registers_mips_dsp_linux (void); extern const struct target_desc *tdesc_mips_dsp_linux; /* Defined in auto-generated file mips64-linux.c. */ void init_registers_mips64_linux (void); extern const struct target_desc *tdesc_mips64_linux; /* Defined in auto-generated file mips64-dsp-linux.c. */ void init_registers_mips64_dsp_linux (void); extern const struct target_desc *tdesc_mips64_dsp_linux; #ifdef __mips64 #define tdesc_mips_linux tdesc_mips64_linux #define tdesc_mips_dsp_linux tdesc_mips64_dsp_linux #endif #ifndef PTRACE_GET_THREAD_AREA #define PTRACE_GET_THREAD_AREA 25 #endif #ifdef HAVE_SYS_REG_H #include #endif #define mips_num_regs 73 #define mips_dsp_num_regs 80 #include #ifndef DSP_BASE #define DSP_BASE 71 #define DSP_CONTROL 77 #endif union mips_register { unsigned char buf[8]; /* Deliberately signed, for proper sign extension. */ int reg32; long long reg64; }; /* Return the ptrace ``address'' of register REGNO. */ #define mips_base_regs \ -1, 1, 2, 3, 4, 5, 6, 7, \ 8, 9, 10, 11, 12, 13, 14, 15, \ 16, 17, 18, 19, 20, 21, 22, 23, \ 24, 25, 26, 27, 28, 29, 30, 31, \ \ -1, MMLO, MMHI, BADVADDR, CAUSE, PC, \ \ FPR_BASE, FPR_BASE + 1, FPR_BASE + 2, FPR_BASE + 3, \ FPR_BASE + 4, FPR_BASE + 5, FPR_BASE + 6, FPR_BASE + 7, \ FPR_BASE + 8, FPR_BASE + 9, FPR_BASE + 10, FPR_BASE + 11, \ FPR_BASE + 12, FPR_BASE + 13, FPR_BASE + 14, FPR_BASE + 15, \ FPR_BASE + 16, FPR_BASE + 17, FPR_BASE + 18, FPR_BASE + 19, \ FPR_BASE + 20, FPR_BASE + 21, FPR_BASE + 22, FPR_BASE + 23, \ FPR_BASE + 24, FPR_BASE + 25, FPR_BASE + 26, FPR_BASE + 27, \ FPR_BASE + 28, FPR_BASE + 29, FPR_BASE + 30, FPR_BASE + 31, \ FPC_CSR, FPC_EIR #define mips_dsp_regs \ DSP_BASE, DSP_BASE + 1, DSP_BASE + 2, DSP_BASE + 3, \ DSP_BASE + 4, DSP_BASE + 5, \ DSP_CONTROL static int mips_regmap[mips_num_regs] = { mips_base_regs, 0 }; static int mips_dsp_regmap[mips_dsp_num_regs] = { mips_base_regs, mips_dsp_regs, 0 }; /* DSP registers are not in any regset and can only be accessed individually. */ static unsigned char mips_dsp_regset_bitmap[(mips_dsp_num_regs + 7) / 8] = { 0xfe, 0xff, 0xff, 0xff, 0xfe, 0xff, 0xff, 0xff, 0xff, 0x80 }; static int have_dsp = -1; /* Try peeking at an arbitrarily chosen DSP register and pick the available user register set accordingly. */ static const struct target_desc * mips_read_description (void) { if (have_dsp < 0) { int pid = lwpid_of (current_thread); errno = 0; ptrace (PTRACE_PEEKUSER, pid, DSP_CONTROL, 0); switch (errno) { case 0: have_dsp = 1; break; case EIO: have_dsp = 0; break; default: perror_with_name ("ptrace"); break; } } return have_dsp ? tdesc_mips_dsp_linux : tdesc_mips_linux; } void mips_target::low_arch_setup () { current_process ()->tdesc = mips_read_description (); } /* Per-process arch-specific data we want to keep. */ struct arch_process_info { /* -1 if the kernel and/or CPU do not support watch registers. 1 if watch_readback is valid and we can read style, num_valid and the masks. 0 if we need to read the watch_readback. */ int watch_readback_valid; /* Cached watch register read values. */ struct pt_watch_regs watch_readback; /* Current watchpoint requests for this process. */ struct mips_watchpoint *current_watches; /* The current set of watch register values for writing the registers. */ struct pt_watch_regs watch_mirror; }; /* Per-thread arch-specific data we want to keep. */ struct arch_lwp_info { /* Non-zero if our copy differs from what's recorded in the thread. */ int watch_registers_changed; }; /* From mips-linux-nat.c. */ /* Pseudo registers can not be read. ptrace does not provide a way to read (or set) PS_REGNUM, and there's no point in reading or setting ZERO_REGNUM, it's always 0. We also can not set BADVADDR, CAUSE, or FCRIR via ptrace(). */ bool mips_target::low_cannot_fetch_register (int regno) { const struct target_desc *tdesc; if (get_regs_info ()->usrregs->regmap[regno] == -1) return true; tdesc = current_process ()->tdesc; /* On n32 we can't access 64-bit registers via PTRACE_PEEKUSR. */ if (register_size (tdesc, regno) > sizeof (PTRACE_XFER_TYPE)) return true; if (find_regno (tdesc, "r0") == regno) return true; return false; } bool mips_target::low_cannot_store_register (int regno) { const struct target_desc *tdesc; if (get_regs_info ()->usrregs->regmap[regno] == -1) return true; tdesc = current_process ()->tdesc; /* On n32 we can't access 64-bit registers via PTRACE_POKEUSR. */ if (register_size (tdesc, regno) > sizeof (PTRACE_XFER_TYPE)) return true; if (find_regno (tdesc, "r0") == regno) return true; if (find_regno (tdesc, "cause") == regno) return true; if (find_regno (tdesc, "badvaddr") == regno) return true; if (find_regno (tdesc, "fir") == regno) return true; return false; } bool mips_target::low_fetch_register (regcache *regcache, int regno) { const struct target_desc *tdesc = current_process ()->tdesc; if (find_regno (tdesc, "r0") == regno) { supply_register_zeroed (regcache, regno); return true; } return false; } bool mips_target::low_supports_breakpoints () { return true; } CORE_ADDR mips_target::low_get_pc (regcache *regcache) { union mips_register pc; collect_register_by_name (regcache, "pc", pc.buf); return register_size (regcache->tdesc, 0) == 4 ? pc.reg32 : pc.reg64; } void mips_target::low_set_pc (regcache *regcache, CORE_ADDR pc) { union mips_register newpc; if (register_size (regcache->tdesc, 0) == 4) newpc.reg32 = pc; else newpc.reg64 = pc; supply_register_by_name (regcache, "pc", newpc.buf); } /* Correct in either endianness. */ static const unsigned int mips_breakpoint = 0x0005000d; #define mips_breakpoint_len 4 /* Implementation of target ops method "sw_breakpoint_from_kind". */ const gdb_byte * mips_target::sw_breakpoint_from_kind (int kind, int *size) { *size = mips_breakpoint_len; return (const gdb_byte *) &mips_breakpoint; } bool mips_target::low_breakpoint_at (CORE_ADDR where) { unsigned int insn; read_memory (where, (unsigned char *) &insn, 4); if (insn == mips_breakpoint) return true; /* If necessary, recognize more trap instructions here. GDB only uses the one. */ return false; } /* Mark the watch registers of lwp, represented by ENTRY, as changed. */ static void update_watch_registers_callback (thread_info *thread) { struct lwp_info *lwp = get_thread_lwp (thread); /* The actual update is done later just before resuming the lwp, we just mark that the registers need updating. */ lwp->arch_private->watch_registers_changed = 1; /* If the lwp isn't stopped, force it to momentarily pause, so we can update its watch registers. */ if (!lwp->stopped) linux_stop_lwp (lwp); } /* This is the implementation of linux target ops method low_new_process. */ arch_process_info * mips_target::low_new_process () { struct arch_process_info *info = XCNEW (struct arch_process_info); return info; } /* This is the implementation of linux target ops method low_delete_process. */ void mips_target::low_delete_process (arch_process_info *info) { xfree (info); } /* This is the implementation of linux target ops method low_new_thread. Mark the watch registers as changed, so the threads' copies will be updated. */ void mips_target::low_new_thread (lwp_info *lwp) { struct arch_lwp_info *info = XCNEW (struct arch_lwp_info); info->watch_registers_changed = 1; lwp->arch_private = info; } /* Function to call when a thread is being deleted. */ void mips_target::low_delete_thread (arch_lwp_info *arch_lwp) { xfree (arch_lwp); } /* Create a new mips_watchpoint and add it to the list. */ static void mips_add_watchpoint (struct arch_process_info *priv, CORE_ADDR addr, int len, enum target_hw_bp_type watch_type) { struct mips_watchpoint *new_watch; struct mips_watchpoint **pw; new_watch = XNEW (struct mips_watchpoint); new_watch->addr = addr; new_watch->len = len; new_watch->type = watch_type; new_watch->next = NULL; pw = &priv->current_watches; while (*pw != NULL) pw = &(*pw)->next; *pw = new_watch; } /* Hook to call when a new fork is attached. */ void mips_target::low_new_fork (process_info *parent, process_info *child) { struct arch_process_info *parent_private; struct arch_process_info *child_private; struct mips_watchpoint *wp; /* These are allocated by linux_add_process. */ gdb_assert (parent->priv != NULL && parent->priv->arch_private != NULL); gdb_assert (child->priv != NULL && child->priv->arch_private != NULL); /* Linux kernel before 2.6.33 commit 72f674d203cd230426437cdcf7dd6f681dad8b0d will inherit hardware debug registers from parent on fork/vfork/clone. Newer Linux kernels create such tasks with zeroed debug registers. GDB core assumes the child inherits the watchpoints/hw breakpoints of the parent, and will remove them all from the forked off process. Copy the debug registers mirrors into the new process so that all breakpoints and watchpoints can be removed together. The debug registers mirror will become zeroed in the end before detaching the forked off process, thus making this compatible with older Linux kernels too. */ parent_private = parent->priv->arch_private; child_private = child->priv->arch_private; child_private->watch_readback_valid = parent_private->watch_readback_valid; child_private->watch_readback = parent_private->watch_readback; for (wp = parent_private->current_watches; wp != NULL; wp = wp->next) mips_add_watchpoint (child_private, wp->addr, wp->len, wp->type); child_private->watch_mirror = parent_private->watch_mirror; } /* This is the implementation of linux target ops method low_prepare_to_resume. If the watch regs have changed, update the thread's copies. */ void mips_target::low_prepare_to_resume (lwp_info *lwp) { ptid_t ptid = ptid_of (get_lwp_thread (lwp)); struct process_info *proc = find_process_pid (ptid.pid ()); struct arch_process_info *priv = proc->priv->arch_private; if (lwp->arch_private->watch_registers_changed) { /* Only update the watch registers if we have set or unset a watchpoint already. */ if (mips_linux_watch_get_num_valid (&priv->watch_mirror) > 0) { /* Write the mirrored watch register values. */ int tid = ptid.lwp (); if (-1 == ptrace (PTRACE_SET_WATCH_REGS, tid, &priv->watch_mirror, NULL)) perror_with_name ("Couldn't write watch register"); } lwp->arch_private->watch_registers_changed = 0; } } bool mips_target::supports_z_point_type (char z_type) { switch (z_type) { case Z_PACKET_WRITE_WP: case Z_PACKET_READ_WP: case Z_PACKET_ACCESS_WP: return true; default: return false; } } /* This is the implementation of linux target ops method low_insert_point. */ int mips_target::low_insert_point (raw_bkpt_type type, CORE_ADDR addr, int len, raw_breakpoint *bp) { struct process_info *proc = current_process (); struct arch_process_info *priv = proc->priv->arch_private; struct pt_watch_regs regs; long lwpid; enum target_hw_bp_type watch_type; uint32_t irw; lwpid = lwpid_of (current_thread); if (!mips_linux_read_watch_registers (lwpid, &priv->watch_readback, &priv->watch_readback_valid, 0)) return -1; if (len <= 0) return -1; regs = priv->watch_readback; /* Add the current watches. */ mips_linux_watch_populate_regs (priv->current_watches, ®s); /* Now try to add the new watch. */ watch_type = raw_bkpt_type_to_target_hw_bp_type (type); irw = mips_linux_watch_type_to_irw (watch_type); if (!mips_linux_watch_try_one_watch (®s, addr, len, irw)) return -1; /* It fit. Stick it on the end of the list. */ mips_add_watchpoint (priv, addr, len, watch_type); priv->watch_mirror = regs; /* Only update the threads of this process. */ for_each_thread (proc->pid, update_watch_registers_callback); return 0; } /* This is the implementation of linux target ops method low_remove_point. */ int mips_target::low_remove_point (raw_bkpt_type type, CORE_ADDR addr, int len, raw_breakpoint *bp) { struct process_info *proc = current_process (); struct arch_process_info *priv = proc->priv->arch_private; int deleted_one; enum target_hw_bp_type watch_type; struct mips_watchpoint **pw; struct mips_watchpoint *w; /* Search for a known watch that matches. Then unlink and free it. */ watch_type = raw_bkpt_type_to_target_hw_bp_type (type); deleted_one = 0; pw = &priv->current_watches; while ((w = *pw)) { if (w->addr == addr && w->len == len && w->type == watch_type) { *pw = w->next; free (w); deleted_one = 1; break; } pw = &(w->next); } if (!deleted_one) return -1; /* We don't know about it, fail doing nothing. */ /* At this point watch_readback is known to be valid because we could not have added the watch without reading it. */ gdb_assert (priv->watch_readback_valid == 1); priv->watch_mirror = priv->watch_readback; mips_linux_watch_populate_regs (priv->current_watches, &priv->watch_mirror); /* Only update the threads of this process. */ for_each_thread (proc->pid, update_watch_registers_callback); return 0; } /* This is the implementation of linux target ops method low_stopped_by_watchpoint. The watchhi R and W bits indicate the watch register triggered. */ bool mips_target::low_stopped_by_watchpoint () { struct process_info *proc = current_process (); struct arch_process_info *priv = proc->priv->arch_private; int n; int num_valid; long lwpid = lwpid_of (current_thread); if (!mips_linux_read_watch_registers (lwpid, &priv->watch_readback, &priv->watch_readback_valid, 1)) return 0; num_valid = mips_linux_watch_get_num_valid (&priv->watch_readback); for (n = 0; n < MAX_DEBUG_REGISTER && n < num_valid; n++) if (mips_linux_watch_get_watchhi (&priv->watch_readback, n) & (R_MASK | W_MASK)) return true; return false; } /* This is the implementation of linux target ops method low_stopped_data_address. */ CORE_ADDR mips_target::low_stopped_data_address () { struct process_info *proc = current_process (); struct arch_process_info *priv = proc->priv->arch_private; int n; int num_valid; long lwpid = lwpid_of (current_thread); /* On MIPS we don't know the low order 3 bits of the data address. GDB does not support remote targets that can't report the watchpoint address. So, make our best guess; return the starting address of a watchpoint request which overlaps the one that triggered. */ if (!mips_linux_read_watch_registers (lwpid, &priv->watch_readback, &priv->watch_readback_valid, 0)) return 0; num_valid = mips_linux_watch_get_num_valid (&priv->watch_readback); for (n = 0; n < MAX_DEBUG_REGISTER && n < num_valid; n++) if (mips_linux_watch_get_watchhi (&priv->watch_readback, n) & (R_MASK | W_MASK)) { CORE_ADDR t_low, t_hi; int t_irw; struct mips_watchpoint *watch; t_low = mips_linux_watch_get_watchlo (&priv->watch_readback, n); t_irw = t_low & IRW_MASK; t_hi = (mips_linux_watch_get_watchhi (&priv->watch_readback, n) | IRW_MASK); t_low &= ~(CORE_ADDR)t_hi; for (watch = priv->current_watches; watch != NULL; watch = watch->next) { CORE_ADDR addr = watch->addr; CORE_ADDR last_byte = addr + watch->len - 1; if ((t_irw & mips_linux_watch_type_to_irw (watch->type)) == 0) { /* Different type. */ continue; } /* Check for overlap of even a single byte. */ if (last_byte >= t_low && addr <= t_low + t_hi) return addr; } } /* Shouldn't happen. */ return 0; } /* Fetch the thread-local storage pointer for libthread_db. */ ps_err_e ps_get_thread_area (struct ps_prochandle *ph, lwpid_t lwpid, int idx, void **base) { if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0) return PS_ERR; /* IDX is the bias from the thread pointer to the beginning of the thread descriptor. It has to be subtracted due to implementation quirks in libthread_db. */ *base = (void *) ((char *)*base - idx); return PS_OK; } static void mips_collect_register (struct regcache *regcache, int use_64bit, int regno, union mips_register *reg) { union mips_register tmp_reg; if (use_64bit) { collect_register (regcache, regno, &tmp_reg.reg64); *reg = tmp_reg; } else { collect_register (regcache, regno, &tmp_reg.reg32); reg->reg64 = tmp_reg.reg32; } } static void mips_supply_register (struct regcache *regcache, int use_64bit, int regno, const union mips_register *reg) { int offset = 0; /* For big-endian 32-bit targets, ignore the high four bytes of each eight-byte slot. */ if (__BYTE_ORDER == __BIG_ENDIAN && !use_64bit) offset = 4; supply_register (regcache, regno, reg->buf + offset); } #ifdef HAVE_PTRACE_GETREGS static void mips_collect_register_32bit (struct regcache *regcache, int use_64bit, int regno, unsigned char *buf) { union mips_register tmp_reg; int reg32; mips_collect_register (regcache, use_64bit, regno, &tmp_reg); reg32 = tmp_reg.reg64; memcpy (buf, ®32, 4); } static void mips_supply_register_32bit (struct regcache *regcache, int use_64bit, int regno, const unsigned char *buf) { union mips_register tmp_reg; int reg32; memcpy (®32, buf, 4); tmp_reg.reg64 = reg32; mips_supply_register (regcache, use_64bit, regno, &tmp_reg); } static void mips_fill_gregset (struct regcache *regcache, void *buf) { union mips_register *regset = (union mips_register *) buf; int i, use_64bit; const struct target_desc *tdesc = regcache->tdesc; use_64bit = (register_size (tdesc, 0) == 8); for (i = 1; i < 32; i++) mips_collect_register (regcache, use_64bit, i, regset + i); mips_collect_register (regcache, use_64bit, find_regno (tdesc, "lo"), regset + 32); mips_collect_register (regcache, use_64bit, find_regno (tdesc, "hi"), regset + 33); mips_collect_register (regcache, use_64bit, find_regno (tdesc, "pc"), regset + 34); mips_collect_register (regcache, use_64bit, find_regno (tdesc, "badvaddr"), regset + 35); mips_collect_register (regcache, use_64bit, find_regno (tdesc, "status"), regset + 36); mips_collect_register (regcache, use_64bit, find_regno (tdesc, "cause"), regset + 37); mips_collect_register (regcache, use_64bit, find_regno (tdesc, "restart"), regset + 0); } static void mips_store_gregset (struct regcache *regcache, const void *buf) { const union mips_register *regset = (const union mips_register *) buf; int i, use_64bit; use_64bit = (register_size (regcache->tdesc, 0) == 8); supply_register_by_name_zeroed (regcache, "r0"); for (i = 1; i < 32; i++) mips_supply_register (regcache, use_64bit, i, regset + i); mips_supply_register (regcache, use_64bit, find_regno (regcache->tdesc, "lo"), regset + 32); mips_supply_register (regcache, use_64bit, find_regno (regcache->tdesc, "hi"), regset + 33); mips_supply_register (regcache, use_64bit, find_regno (regcache->tdesc, "pc"), regset + 34); mips_supply_register (regcache, use_64bit, find_regno (regcache->tdesc, "badvaddr"), regset + 35); mips_supply_register (regcache, use_64bit, find_regno (regcache->tdesc, "status"), regset + 36); mips_supply_register (regcache, use_64bit, find_regno (regcache->tdesc, "cause"), regset + 37); mips_supply_register (regcache, use_64bit, find_regno (regcache->tdesc, "restart"), regset + 0); } static void mips_fill_fpregset (struct regcache *regcache, void *buf) { union mips_register *regset = (union mips_register *) buf; int i, use_64bit, first_fp, big_endian; use_64bit = (register_size (regcache->tdesc, 0) == 8); first_fp = find_regno (regcache->tdesc, "f0"); big_endian = (__BYTE_ORDER == __BIG_ENDIAN); /* See GDB for a discussion of this peculiar layout. */ for (i = 0; i < 32; i++) if (use_64bit) collect_register (regcache, first_fp + i, regset[i].buf); else collect_register (regcache, first_fp + i, regset[i & ~1].buf + 4 * (big_endian != (i & 1))); mips_collect_register_32bit (regcache, use_64bit, find_regno (regcache->tdesc, "fcsr"), regset[32].buf); mips_collect_register_32bit (regcache, use_64bit, find_regno (regcache->tdesc, "fir"), regset[32].buf + 4); } static void mips_store_fpregset (struct regcache *regcache, const void *buf) { const union mips_register *regset = (const union mips_register *) buf; int i, use_64bit, first_fp, big_endian; use_64bit = (register_size (regcache->tdesc, 0) == 8); first_fp = find_regno (regcache->tdesc, "f0"); big_endian = (__BYTE_ORDER == __BIG_ENDIAN); /* See GDB for a discussion of this peculiar layout. */ for (i = 0; i < 32; i++) if (use_64bit) supply_register (regcache, first_fp + i, regset[i].buf); else supply_register (regcache, first_fp + i, regset[i & ~1].buf + 4 * (big_endian != (i & 1))); mips_supply_register_32bit (regcache, use_64bit, find_regno (regcache->tdesc, "fcsr"), regset[32].buf); mips_supply_register_32bit (regcache, use_64bit, find_regno (regcache->tdesc, "fir"), regset[32].buf + 4); } #endif /* HAVE_PTRACE_GETREGS */ /* Take care of 32-bit registers with 64-bit ptrace, POKEUSER side. */ void mips_target::low_collect_ptrace_register (regcache *regcache, int regno, char *buf) { int use_64bit = sizeof (PTRACE_XFER_TYPE) == 8; if (use_64bit && register_size (regcache->tdesc, regno) == 4) { union mips_register reg; mips_collect_register (regcache, 0, regno, ®); memcpy (buf, ®, sizeof (reg)); } else collect_register (regcache, regno, buf); } /* Take care of 32-bit registers with 64-bit ptrace, PEEKUSER side. */ void mips_target::low_supply_ptrace_register (regcache *regcache, int regno, const char *buf) { int use_64bit = sizeof (PTRACE_XFER_TYPE) == 8; if (use_64bit && register_size (regcache->tdesc, regno) == 4) { union mips_register reg; memcpy (®, buf, sizeof (reg)); mips_supply_register (regcache, 0, regno, ®); } else supply_register (regcache, regno, buf); } static struct regset_info mips_regsets[] = { #ifdef HAVE_PTRACE_GETREGS { PTRACE_GETREGS, PTRACE_SETREGS, 0, 38 * 8, GENERAL_REGS, mips_fill_gregset, mips_store_gregset }, { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, 33 * 8, FP_REGS, mips_fill_fpregset, mips_store_fpregset }, #endif /* HAVE_PTRACE_GETREGS */ NULL_REGSET }; static struct regsets_info mips_regsets_info = { mips_regsets, /* regsets */ 0, /* num_regsets */ NULL, /* disabled_regsets */ }; static struct usrregs_info mips_dsp_usrregs_info = { mips_dsp_num_regs, mips_dsp_regmap, }; static struct usrregs_info mips_usrregs_info = { mips_num_regs, mips_regmap, }; static struct regs_info dsp_regs_info = { mips_dsp_regset_bitmap, &mips_dsp_usrregs_info, &mips_regsets_info }; static struct regs_info myregs_info = { NULL, /* regset_bitmap */ &mips_usrregs_info, &mips_regsets_info }; const regs_info * mips_target::get_regs_info () { if (have_dsp) return &dsp_regs_info; else return &myregs_info; } /* The linux target ops object. */ linux_process_target *the_linux_target = &the_mips_target; void initialize_low_arch (void) { /* Initialize the Linux target descriptions. */ init_registers_mips_linux (); init_registers_mips_dsp_linux (); init_registers_mips64_linux (); init_registers_mips64_dsp_linux (); initialize_regsets_info (&mips_regsets_info); }