// SPDX-License-Identifier: GPL-2.0 /* ptrace.c: Sparc process tracing support. * * Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net) * * Based upon code written by Ross Biro, Linus Torvalds, Bob Manson, * and David Mosberger. * * Added Linux support -miguel (weird, eh?, the original code was meant * to emulate SunOS). */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "kernel.h" /* #define ALLOW_INIT_TRACING */ /* * Called by kernel/ptrace.c when detaching.. * * Make sure single step bits etc are not set. */ void ptrace_disable(struct task_struct *child) { /* nothing to do */ } enum sparc_regset { REGSET_GENERAL, REGSET_FP, }; static int regwindow32_get(struct task_struct *target, const struct pt_regs *regs, u32 *uregs) { unsigned long reg_window = regs->u_regs[UREG_I6]; int size = 16 * sizeof(u32); if (target == current) { if (copy_from_user(uregs, (void __user *)reg_window, size)) return -EFAULT; } else { if (access_process_vm(target, reg_window, uregs, size, FOLL_FORCE) != size) return -EFAULT; } return 0; } static int regwindow32_set(struct task_struct *target, const struct pt_regs *regs, u32 *uregs) { unsigned long reg_window = regs->u_regs[UREG_I6]; int size = 16 * sizeof(u32); if (target == current) { if (copy_to_user((void __user *)reg_window, uregs, size)) return -EFAULT; } else { if (access_process_vm(target, reg_window, uregs, size, FOLL_FORCE | FOLL_WRITE) != size) return -EFAULT; } return 0; } static int genregs32_get(struct task_struct *target, const struct user_regset *regset, struct membuf to) { const struct pt_regs *regs = target->thread.kregs; u32 uregs[16]; if (target == current) flush_user_windows(); membuf_write(&to, regs->u_regs, 16 * sizeof(u32)); if (!to.left) return 0; if (regwindow32_get(target, regs, uregs)) return -EFAULT; membuf_write(&to, uregs, 16 * sizeof(u32)); membuf_store(&to, regs->psr); membuf_store(&to, regs->pc); membuf_store(&to, regs->npc); membuf_store(&to, regs->y); return membuf_zero(&to, 2 * sizeof(u32)); } static int genregs32_set(struct task_struct *target, const struct user_regset *regset, unsigned int pos, unsigned int count, const void *kbuf, const void __user *ubuf) { struct pt_regs *regs = target->thread.kregs; u32 uregs[16]; u32 psr; int ret; if (target == current) flush_user_windows(); ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs->u_regs, 0, 16 * sizeof(u32)); if (ret || !count) return ret; if (regwindow32_get(target, regs, uregs)) return -EFAULT; ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 16 * sizeof(u32), 32 * sizeof(u32)); if (ret) return ret; if (regwindow32_set(target, regs, uregs)) return -EFAULT; if (!count) return 0; ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &psr, 32 * sizeof(u32), 33 * sizeof(u32)); if (ret) return ret; regs->psr = (regs->psr & ~(PSR_ICC | PSR_SYSCALL)) | (psr & (PSR_ICC | PSR_SYSCALL)); if (!count) return 0; ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®s->pc, 33 * sizeof(u32), 34 * sizeof(u32)); if (ret || !count) return ret; ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®s->npc, 34 * sizeof(u32), 35 * sizeof(u32)); if (ret || !count) return ret; ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®s->y, 35 * sizeof(u32), 36 * sizeof(u32)); if (ret || !count) return ret; user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 36 * sizeof(u32), 38 * sizeof(u32)); return 0; } static int fpregs32_get(struct task_struct *target, const struct user_regset *regset, struct membuf to) { #if 0 if (target == current) save_and_clear_fpu(); #endif membuf_write(&to, target->thread.float_regs, 32 * sizeof(u32)); membuf_zero(&to, sizeof(u32)); membuf_write(&to, &target->thread.fsr, sizeof(u32)); membuf_store(&to, (u32)((1 << 8) | (8 << 16))); return membuf_zero(&to, 64 * sizeof(u32)); } static int fpregs32_set(struct task_struct *target, const struct user_regset *regset, unsigned int pos, unsigned int count, const void *kbuf, const void __user *ubuf) { unsigned long *fpregs = target->thread.float_regs; int ret; #if 0 if (target == current) save_and_clear_fpu(); #endif ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, fpregs, 0, 32 * sizeof(u32)); if (!ret) user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 32 * sizeof(u32), 33 * sizeof(u32)); if (!ret) ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &target->thread.fsr, 33 * sizeof(u32), 34 * sizeof(u32)); if (!ret) user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 34 * sizeof(u32), -1); return ret; } static const struct user_regset sparc32_regsets[] = { /* Format is: * G0 --> G7 * O0 --> O7 * L0 --> L7 * I0 --> I7 * PSR, PC, nPC, Y, WIM, TBR */ [REGSET_GENERAL] = { .core_note_type = NT_PRSTATUS, .n = 38, .size = sizeof(u32), .align = sizeof(u32), .regset_get = genregs32_get, .set = genregs32_set }, /* Format is: * F0 --> F31 * empty 32-bit word * FSR (32--bit word) * FPU QUEUE COUNT (8-bit char) * FPU QUEUE ENTRYSIZE (8-bit char) * FPU ENABLED (8-bit char) * empty 8-bit char * FPU QUEUE (64 32-bit ints) */ [REGSET_FP] = { .core_note_type = NT_PRFPREG, .n = 99, .size = sizeof(u32), .align = sizeof(u32), .regset_get = fpregs32_get, .set = fpregs32_set }, }; static int getregs_get(struct task_struct *target, const struct user_regset *regset, struct membuf to) { const struct pt_regs *regs = target->thread.kregs; if (target == current) flush_user_windows(); membuf_store(&to, regs->psr); membuf_store(&to, regs->pc); membuf_store(&to, regs->npc); membuf_store(&to, regs->y); return membuf_write(&to, regs->u_regs + 1, 15 * sizeof(u32)); } static int setregs_set(struct task_struct *target, const struct user_regset *regset, unsigned int pos, unsigned int count, const void *kbuf, const void __user *ubuf) { struct pt_regs *regs = target->thread.kregs; u32 v[4]; int ret; if (target == current) flush_user_windows(); ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, v, 0, 4 * sizeof(u32)); if (ret) return ret; regs->psr = (regs->psr & ~(PSR_ICC | PSR_SYSCALL)) | (v[0] & (PSR_ICC | PSR_SYSCALL)); regs->pc = v[1]; regs->npc = v[2]; regs->y = v[3]; return user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs->u_regs + 1, 4 * sizeof(u32) , 19 * sizeof(u32)); } static int getfpregs_get(struct task_struct *target, const struct user_regset *regset, struct membuf to) { #if 0 if (target == current) save_and_clear_fpu(); #endif membuf_write(&to, &target->thread.float_regs, 32 * sizeof(u32)); membuf_write(&to, &target->thread.fsr, sizeof(u32)); return membuf_zero(&to, 35 * sizeof(u32)); } static int setfpregs_set(struct task_struct *target, const struct user_regset *regset, unsigned int pos, unsigned int count, const void *kbuf, const void __user *ubuf) { unsigned long *fpregs = target->thread.float_regs; int ret; #if 0 if (target == current) save_and_clear_fpu(); #endif ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, fpregs, 0, 32 * sizeof(u32)); if (ret) return ret; return user_regset_copyin(&pos, &count, &kbuf, &ubuf, &target->thread.fsr, 32 * sizeof(u32), 33 * sizeof(u32)); } static const struct user_regset ptrace32_regsets[] = { [REGSET_GENERAL] = { .n = 19, .size = sizeof(u32), .regset_get = getregs_get, .set = setregs_set, }, [REGSET_FP] = { .n = 68, .size = sizeof(u32), .regset_get = getfpregs_get, .set = setfpregs_set, }, }; static const struct user_regset_view ptrace32_view = { .regsets = ptrace32_regsets, .n = ARRAY_SIZE(ptrace32_regsets) }; static const struct user_regset_view user_sparc32_view = { .name = "sparc", .e_machine = EM_SPARC, .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets) }; const struct user_regset_view *task_user_regset_view(struct task_struct *task) { return &user_sparc32_view; } struct fps { unsigned long regs[32]; unsigned long fsr; unsigned long flags; unsigned long extra; unsigned long fpqd; struct fq { unsigned long *insnaddr; unsigned long insn; } fpq[16]; }; long arch_ptrace(struct task_struct *child, long request, unsigned long addr, unsigned long data) { unsigned long addr2 = current->thread.kregs->u_regs[UREG_I4]; void __user *addr2p; struct pt_regs __user *pregs; struct fps __user *fps; int ret; addr2p = (void __user *) addr2; pregs = (struct pt_regs __user *) addr; fps = (struct fps __user *) addr; switch(request) { case PTRACE_GETREGS: { ret = copy_regset_to_user(child, &ptrace32_view, REGSET_GENERAL, 0, 19 * sizeof(u32), pregs); break; } case PTRACE_SETREGS: { ret = copy_regset_from_user(child, &ptrace32_view, REGSET_GENERAL, 0, 19 * sizeof(u32), pregs); break; } case PTRACE_GETFPREGS: { ret = copy_regset_to_user(child, &ptrace32_view, REGSET_FP, 0, 68 * sizeof(u32), fps); break; } case PTRACE_SETFPREGS: { ret = copy_regset_from_user(child, &ptrace32_view, REGSET_FP, 0, 33 * sizeof(u32), fps); break; } case PTRACE_READTEXT: case PTRACE_READDATA: ret = ptrace_readdata(child, addr, addr2p, data); if (ret == data) ret = 0; else if (ret >= 0) ret = -EIO; break; case PTRACE_WRITETEXT: case PTRACE_WRITEDATA: ret = ptrace_writedata(child, addr2p, addr, data); if (ret == data) ret = 0; else if (ret >= 0) ret = -EIO; break; default: if (request == PTRACE_SPARC_DETACH) request = PTRACE_DETACH; ret = ptrace_request(child, request, addr, data); break; } return ret; } asmlinkage int syscall_trace(struct pt_regs *regs, int syscall_exit_p) { int ret = 0; if (test_thread_flag(TIF_SYSCALL_TRACE)) { if (syscall_exit_p) ptrace_report_syscall_exit(regs, 0); else ret = ptrace_report_syscall_entry(regs); } return ret; }