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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 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 | /* * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/ptrace.h> #include <linux/tracehook.h> #include <linux/regset.h> #include <linux/unistd.h> #include <linux/elf.h> static struct callee_regs *task_callee_regs(struct task_struct *tsk) { struct callee_regs *tmp = (struct callee_regs *)tsk->thread.callee_reg; return tmp; } static int genregs_get(struct task_struct *target, const struct user_regset *regset, unsigned int pos, unsigned int count, void *kbuf, void __user *ubuf) { const struct pt_regs *ptregs = task_pt_regs(target); const struct callee_regs *cregs = task_callee_regs(target); int ret = 0; unsigned int stop_pc_val; #define REG_O_CHUNK(START, END, PTR) \ if (!ret) \ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \ offsetof(struct user_regs_struct, START), \ offsetof(struct user_regs_struct, END)); #define REG_O_ONE(LOC, PTR) \ if (!ret) \ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \ offsetof(struct user_regs_struct, LOC), \ offsetof(struct user_regs_struct, LOC) + 4); #define REG_O_ZERO(LOC) \ if (!ret) \ ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, \ offsetof(struct user_regs_struct, LOC), \ offsetof(struct user_regs_struct, LOC) + 4); REG_O_ZERO(pad); REG_O_CHUNK(scratch, callee, ptregs); REG_O_ZERO(pad2); REG_O_CHUNK(callee, efa, cregs); REG_O_CHUNK(efa, stop_pc, &target->thread.fault_address); if (!ret) { if (in_brkpt_trap(ptregs)) { stop_pc_val = target->thread.fault_address; pr_debug("\t\tstop_pc (brk-pt)\n"); } else { stop_pc_val = ptregs->ret; pr_debug("\t\tstop_pc (others)\n"); } REG_O_ONE(stop_pc, &stop_pc_val); } return ret; } static int genregs_set(struct task_struct *target, const struct user_regset *regset, unsigned int pos, unsigned int count, const void *kbuf, const void __user *ubuf) { const struct pt_regs *ptregs = task_pt_regs(target); const struct callee_regs *cregs = task_callee_regs(target); int ret = 0; #define REG_IN_CHUNK(FIRST, NEXT, PTR) \ if (!ret) \ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \ (void *)(PTR), \ offsetof(struct user_regs_struct, FIRST), \ offsetof(struct user_regs_struct, NEXT)); #define REG_IN_ONE(LOC, PTR) \ if (!ret) \ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \ (void *)(PTR), \ offsetof(struct user_regs_struct, LOC), \ offsetof(struct user_regs_struct, LOC) + 4); #define REG_IGNORE_ONE(LOC) \ if (!ret) \ ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \ offsetof(struct user_regs_struct, LOC), \ offsetof(struct user_regs_struct, LOC) + 4); REG_IGNORE_ONE(pad); /* TBD: disallow updates to STATUS32 etc*/ REG_IN_CHUNK(scratch, pad2, ptregs); /* pt_regs[bta..sp] */ REG_IGNORE_ONE(pad2); REG_IN_CHUNK(callee, efa, cregs); /* callee_regs[r25..r13] */ REG_IGNORE_ONE(efa); /* efa update invalid */ REG_IN_ONE(stop_pc, &ptregs->ret); /* stop_pc: PC update */ return ret; } enum arc_getset { REGSET_GENERAL, }; static const struct user_regset arc_regsets[] = { [REGSET_GENERAL] = { .core_note_type = NT_PRSTATUS, .n = ELF_NGREG, .size = sizeof(unsigned long), .align = sizeof(unsigned long), .get = genregs_get, .set = genregs_set, } }; static const struct user_regset_view user_arc_view = { .name = UTS_MACHINE, .e_machine = EM_ARCOMPACT, .regsets = arc_regsets, .n = ARRAY_SIZE(arc_regsets) }; const struct user_regset_view *task_user_regset_view(struct task_struct *task) { return &user_arc_view; } void ptrace_disable(struct task_struct *child) { } long arch_ptrace(struct task_struct *child, long request, unsigned long addr, unsigned long data) { int ret = -EIO; pr_debug("REQ=%ld: ADDR =0x%lx, DATA=0x%lx)\n", request, addr, data); switch (request) { default: ret = ptrace_request(child, request, addr, data); break; } return ret; } asmlinkage int syscall_trace_entry(struct pt_regs *regs) { if (tracehook_report_syscall_entry(regs)) return ULONG_MAX; return regs->r8; } asmlinkage void syscall_trace_exit(struct pt_regs *regs) { tracehook_report_syscall_exit(regs, 0); } |