/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2004 Marcel Moolenaar * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include void * gdb_cpu_getreg(int regnum, size_t *regsz) { static uint32_t _kcodesel = GSEL(GCODE_SEL, SEL_KPL); static uint32_t _kdatasel = GSEL(GDATA_SEL, SEL_KPL); *regsz = gdb_cpu_regsz(regnum); if (kdb_thread == curthread) { switch (regnum) { case GDB_REG_RAX: return (&kdb_frame->tf_rax); case GDB_REG_RCX: return (&kdb_frame->tf_rcx); case GDB_REG_RDX: return (&kdb_frame->tf_rdx); case GDB_REG_RSI: return (&kdb_frame->tf_rsi); case GDB_REG_RDI: return (&kdb_frame->tf_rdi); case GDB_REG_R8: return (&kdb_frame->tf_r8); case GDB_REG_R9: return (&kdb_frame->tf_r9); case GDB_REG_R10: return (&kdb_frame->tf_r10); case GDB_REG_R11: return (&kdb_frame->tf_r11); case GDB_REG_RFLAGS: return (&kdb_frame->tf_rflags); case GDB_REG_CS: return (&kdb_frame->tf_cs); case GDB_REG_SS: return (&kdb_frame->tf_ss); } } switch (regnum) { case GDB_REG_RBX: return (&kdb_thrctx->pcb_rbx); case GDB_REG_RBP: return (&kdb_thrctx->pcb_rbp); case GDB_REG_RSP: return (&kdb_thrctx->pcb_rsp); case GDB_REG_R12: return (&kdb_thrctx->pcb_r12); case GDB_REG_R13: return (&kdb_thrctx->pcb_r13); case GDB_REG_R14: return (&kdb_thrctx->pcb_r14); case GDB_REG_R15: return (&kdb_thrctx->pcb_r15); case GDB_REG_PC: return (&kdb_thrctx->pcb_rip); case GDB_REG_CS: return (&_kcodesel); case GDB_REG_SS: return (&_kdatasel); } return (NULL); } void gdb_cpu_setreg(int regnum, void *val) { register_t regval = *(register_t *)val; /* * Write registers to the trapframe and pcb, if applicable. * Some scratch registers are not tracked by the pcb. */ if (kdb_thread == curthread) { switch (regnum) { case GDB_REG_RAX: kdb_frame->tf_rax = regval; break; case GDB_REG_RBX: kdb_frame->tf_rbx = regval; break; case GDB_REG_RCX: kdb_frame->tf_rcx = regval; break; case GDB_REG_RDX: kdb_frame->tf_rdx = regval; break; case GDB_REG_RSI: kdb_frame->tf_rsi = regval; break; case GDB_REG_RDI: kdb_frame->tf_rdi = regval; break; case GDB_REG_RBP: kdb_frame->tf_rbp = regval; break; case GDB_REG_RSP: kdb_frame->tf_rsp = regval; break; case GDB_REG_R8: kdb_frame->tf_r8 = regval; break; case GDB_REG_R9: kdb_frame->tf_r9 = regval; break; case GDB_REG_R10: kdb_frame->tf_r10 = regval; break; case GDB_REG_R11: kdb_frame->tf_r11 = regval; break; case GDB_REG_R12: kdb_frame->tf_r12 = regval; break; case GDB_REG_R13: kdb_frame->tf_r13 = regval; break; case GDB_REG_R14: kdb_frame->tf_r14 = regval; break; case GDB_REG_R15: kdb_frame->tf_r15 = regval; break; case GDB_REG_PC: kdb_frame->tf_rip = regval; break; } } switch (regnum) { case GDB_REG_RBX: kdb_thrctx->pcb_rbx = regval; break; case GDB_REG_RBP: kdb_thrctx->pcb_rbp = regval; break; case GDB_REG_RSP: kdb_thrctx->pcb_rsp = regval; break; case GDB_REG_R12: kdb_thrctx->pcb_r12 = regval; break; case GDB_REG_R13: kdb_thrctx->pcb_r13 = regval; break; case GDB_REG_R14: kdb_thrctx->pcb_r14 = regval; break; case GDB_REG_R15: kdb_thrctx->pcb_r15 = regval; break; case GDB_REG_PC: kdb_thrctx->pcb_rip = regval; break; } } int gdb_cpu_signal(int type, int code) { switch (type) { case T_BPTFLT: return (SIGTRAP); case T_ARITHTRAP: return (SIGFPE); case T_PROTFLT: return (SIGSEGV); case T_TRCTRAP: return (SIGTRAP); case T_PAGEFLT: return (SIGSEGV); case T_DIVIDE: return (SIGFPE); case T_NMI: return (SIGTRAP); case T_FPOPFLT: return (SIGILL); case T_TSSFLT: return (SIGSEGV); case T_SEGNPFLT: return (SIGSEGV); case T_STKFLT: return (SIGSEGV); case T_XMMFLT: return (SIGFPE); } return (SIGEMT); } void gdb_cpu_stop_reason(int type, int code) { uintmax_t val; val = 0; if (type == T_TRCTRAP) { /* NB: 'code' contains the value of dr6 at the trap. */ if ((code & DBREG_DR6_B(0)) != 0) { val = rdr0(); } if ((code & DBREG_DR6_B(1)) != 0) { val = rdr1(); } if ((code & DBREG_DR6_B(2)) != 0) { val = rdr2(); } if ((code & DBREG_DR6_B(3)) != 0) { val = rdr3(); } /* * TODO: validate the bits in DR7 to differentiate between a * watchpoint trap and a hardware breakpoint trap (currently * unsupported). */ if (val != 0) { gdb_tx_str("watch:"); gdb_tx_varhex(val); gdb_tx_char(';'); } } } void * gdb_begin_write(void) { return (disable_wp() ? &gdb_begin_write : NULL); } void gdb_end_write(void *arg) { restore_wp(arg != NULL); }