1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2006 Marcel Moolenaar 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/kdb.h> 35 #include <sys/kernel.h> 36 #include <sys/proc.h> 37 #include <sys/signal.h> 38 39 #include <machine/gdb_machdep.h> 40 #include <machine/pcb.h> 41 42 #include <machine/hid.h> 43 #include <machine/spr.h> 44 45 #include <machine/trap.h> 46 47 #include <gdb/gdb.h> 48 #include <gdb/gdb_int.h> 49 50 extern vm_offset_t __startkernel; 51 52 void * 53 gdb_cpu_getreg(int regnum, size_t *regsz) 54 { 55 56 *regsz = gdb_cpu_regsz(regnum); 57 58 if (kdb_thread == curthread) { 59 if (regnum == 0 || (regnum >= 2 && regnum <= 31)) 60 return (kdb_frame->fixreg + regnum); 61 if (regnum == 64) 62 return (&kdb_frame->srr0); 63 if (regnum == 67) 64 return (&kdb_frame->lr); 65 } 66 67 if (regnum == 1) 68 return (&kdb_thrctx->pcb_sp); 69 if (regnum == 2 && *regsz == 8) 70 return (&kdb_thrctx->pcb_toc); 71 if (regnum >= 12 && regnum <= 31) 72 return (kdb_thrctx->pcb_context + (regnum - 12)); 73 if (regnum == 64) 74 return (&kdb_thrctx->pcb_lr); 75 76 return (NULL); 77 } 78 79 void 80 gdb_cpu_setreg(int regnum, void *val) 81 { 82 83 switch (regnum) { 84 case GDB_REG_PC: 85 break; 86 } 87 } 88 89 int 90 gdb_cpu_signal(int vector, int dummy __unused) 91 { 92 #if defined(BOOKE) 93 if (vector == EXC_DEBUG || vector == EXC_PGM) 94 return (SIGTRAP); 95 #else 96 if (vector == EXC_TRC || vector == EXC_RUNMODETRC) 97 return (SIGTRAP); 98 #endif 99 100 return (SIGEMT); 101 } 102 103 void 104 gdb_cpu_do_offsets(void) 105 { 106 /* 107 * On PowerPC, .text starts at KERNBASE + SIZEOF_HEADERS and 108 * text segment at KERNBASE - SIZEOF_HEADERS. 109 * On PowerPC64, .text starts at KERNBASE and text segment at 110 * KERNBASE - 0x100. 111 * In both cases, the text segment offset is aligned to 64KB. 112 * 113 * The __startkernel variable holds the relocated KERNBASE offset. 114 * Thus, as long as SIZEOF_HEADERS doesn't get bigger than 0x100 115 * (which would lead to other issues), aligning __startkernel to 116 * 64KB gives the text segment offset. 117 * 118 * TODO: Add DataSeg to response. On PowerPC64 all sections reside 119 * in a single LOAD segment, but on PowerPC modifiable data reside 120 * in a separate segment, that GDB should also relocate. 121 */ 122 gdb_tx_begin(0); 123 gdb_tx_str("TextSeg="); 124 gdb_tx_varhex(__startkernel & ~0xffff); 125 gdb_tx_end(); 126 } 127