/* ptrace.c: Sparc process tracing support. * * Copyright (C) 1996 David S. Miller (davem@caipfs.rutgers.edu) * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) * * 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 <linux/kernel.h> #include <linux/sched.h> #include <linux/mm.h> #include <linux/errno.h> #include <linux/ptrace.h> #include <linux/user.h> #include <linux/smp.h> #include <linux/smp_lock.h> #include <linux/security.h> #include <linux/seccomp.h> #include <linux/audit.h> #include <linux/signal.h> #include <asm/asi.h> #include <asm/pgtable.h> #include <asm/system.h> #include <asm/uaccess.h> #include <asm/psrcompat.h> #include <asm/visasm.h> #include <asm/spitfire.h> #include <asm/page.h> #include <asm/cpudata.h> /* Returning from ptrace is a bit tricky because the syscall return * low level code assumes any value returned which is negative and * is a valid errno will mean setting the condition codes to indicate * an error return. This doesn't work, so we have this hook. */ static inline void pt_error_return(struct pt_regs *regs, unsigned long error) { regs->u_regs[UREG_I0] = error; regs->tstate |= (TSTATE_ICARRY | TSTATE_XCARRY); regs->tpc = regs->tnpc; regs->tnpc += 4; } static inline void pt_succ_return(struct pt_regs *regs, unsigned long value) { regs->u_regs[UREG_I0] = value; regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY); regs->tpc = regs->tnpc; regs->tnpc += 4; } static inline void pt_succ_return_linux(struct pt_regs *regs, unsigned long value, void __user *addr) { if (test_thread_flag(TIF_32BIT)) { if (put_user(value, (unsigned int __user *) addr)) { pt_error_return(regs, EFAULT); return; } } else { if (put_user(value, (long __user *) addr)) { pt_error_return(regs, EFAULT); return; } } regs->u_regs[UREG_I0] = 0; regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY); regs->tpc = regs->tnpc; regs->tnpc += 4; } static void pt_os_succ_return (struct pt_regs *regs, unsigned long val, void __user *addr) { if (current->personality == PER_SUNOS) pt_succ_return (regs, val); else pt_succ_return_linux (regs, val, addr); } /* #define ALLOW_INIT_TRACING */ /* #define DEBUG_PTRACE */ #ifdef DEBUG_PTRACE char *pt_rq [] = { /* 0 */ "TRACEME", "PEEKTEXT", "PEEKDATA", "PEEKUSR", /* 4 */ "POKETEXT", "POKEDATA", "POKEUSR", "CONT", /* 8 */ "KILL", "SINGLESTEP", "SUNATTACH", "SUNDETACH", /* 12 */ "GETREGS", "SETREGS", "GETFPREGS", "SETFPREGS", /* 16 */ "READDATA", "WRITEDATA", "READTEXT", "WRITETEXT", /* 20 */ "GETFPAREGS", "SETFPAREGS", "unknown", "unknown", /* 24 */ "SYSCALL", "" }; #endif /* * 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 */ } /* To get the necessary page struct, access_process_vm() first calls * get_user_pages(). This has done a flush_dcache_page() on the * accessed page. Then our caller (copy_{to,from}_user_page()) did * to memcpy to read/write the data from that page. * * Now, the only thing we have to do is: * 1) flush the D-cache if it's possible than an illegal alias * has been created * 2) flush the I-cache if this is pre-cheetah and we did a write */ void flush_ptrace_access(struct vm_area_struct *vma, struct page *page, unsigned long uaddr, void *kaddr, unsigned long len, int write) { BUG_ON(len > PAGE_SIZE); if (tlb_type == hypervisor) return; #ifdef DCACHE_ALIASING_POSSIBLE /* If bit 13 of the kernel address we used to access the * user page is the same as the virtual address that page * is mapped to in the user's address space, we can skip the * D-cache flush. */ if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) { unsigned long start = __pa(kaddr); unsigned long end = start + len; unsigned long dcache_line_size; dcache_line_size = local_cpu_data().dcache_line_size; if (tlb_type == spitfire) { for (; start < end; start += dcache_line_size) spitfire_put_dcache_tag(start & 0x3fe0, 0x0); } else { start &= ~(dcache_line_size - 1); for (; start < end; start += dcache_line_size) __asm__ __volatile__( "stxa %%g0, [%0] %1\n\t" "membar #Sync" : /* no outputs */ : "r" (start), "i" (ASI_DCACHE_INVALIDATE)); } } #endif if (write && tlb_type == spitfire) { unsigned long start = (unsigned long) kaddr; unsigned long end = start + len; unsigned long icache_line_size; icache_line_size = local_cpu_data().icache_line_size; for (; start < end; start += icache_line_size) flushi(start); } } asmlinkage void do_ptrace(struct pt_regs *regs) { int request = regs->u_regs[UREG_I0]; pid_t pid = regs->u_regs[UREG_I1]; unsigned long addr = regs->u_regs[UREG_I2]; unsigned long data = regs->u_regs[UREG_I3]; unsigned long addr2 = regs->u_regs[UREG_I4]; struct task_struct *child; int ret; if (test_thread_flag(TIF_32BIT)) { addr &= 0xffffffffUL; data &= 0xffffffffUL; addr2 &= 0xffffffffUL; } lock_kernel(); #ifdef DEBUG_PTRACE { char *s; if ((request >= 0) && (request <= 24)) s = pt_rq [request]; else s = "unknown"; if (request == PTRACE_POKEDATA && data == 0x91d02001){ printk ("do_ptrace: breakpoint pid=%d, addr=%016lx addr2=%016lx\n", pid, addr, addr2); } else printk("do_ptrace: rq=%s(%d) pid=%d addr=%016lx data=%016lx addr2=%016lx\n", s, request, pid, addr, data, addr2); } #endif if (request == PTRACE_TRACEME) { ret = ptrace_traceme(); pt_succ_return(regs, 0); goto out; } child = ptrace_get_task_struct(pid); if (IS_ERR(child)) { ret = PTR_ERR(child); pt_error_return(regs, -ret); goto out; } if ((current->personality == PER_SUNOS && request == PTRACE_SUNATTACH) || (current->personality != PER_SUNOS && request == PTRACE_ATTACH)) { if (ptrace_attach(child)) { pt_error_return(regs, EPERM); goto out_tsk; } pt_succ_return(regs, 0); goto out_tsk; } ret = ptrace_check_attach(child, request == PTRACE_KILL); if (ret < 0) { pt_error_return(regs, -ret); goto out_tsk; } if (!(test_thread_flag(TIF_32BIT)) && ((request == PTRACE_READDATA64) || (request == PTRACE_WRITEDATA64) || (request == PTRACE_READTEXT64) || (request == PTRACE_WRITETEXT64) || (request == PTRACE_PEEKTEXT64) || (request == PTRACE_POKETEXT64) || (request == PTRACE_PEEKDATA64) || (request == PTRACE_POKEDATA64))) { addr = regs->u_regs[UREG_G2]; addr2 = regs->u_regs[UREG_G3]; request -= 30; /* wheee... */ } switch(request) { case PTRACE_PEEKUSR: if (addr != 0) pt_error_return(regs, EIO); else pt_succ_return(regs, 0); goto out_tsk; case PTRACE_PEEKTEXT: /* read word at location addr. */ case PTRACE_PEEKDATA: { unsigned long tmp64; unsigned int tmp32; int res, copied; res = -EIO; if (test_thread_flag(TIF_32BIT)) { copied = access_process_vm(child, addr, &tmp32, sizeof(tmp32), 0); tmp64 = (unsigned long) tmp32; if (copied == sizeof(tmp32)) res = 0; } else { copied = access_process_vm(child, addr, &tmp64, sizeof(tmp64), 0); if (copied == sizeof(tmp64)) res = 0; } if (res < 0) pt_error_return(regs, -res); else pt_os_succ_return(regs, tmp64, (void __user *) data); goto out_tsk; } case PTRACE_POKETEXT: /* write the word at location addr. */ case PTRACE_POKEDATA: { unsigned long tmp64; unsigned int tmp32; int copied, res = -EIO; if (test_thread_flag(TIF_32BIT)) { tmp32 = data; copied = access_process_vm(child, addr, &tmp32, sizeof(tmp32), 1); if (copied == sizeof(tmp32)) res = 0; } else { tmp64 = data; copied = access_process_vm(child, addr, &tmp64, sizeof(tmp64), 1); if (copied == sizeof(tmp64)) res = 0; } if (res < 0) pt_error_return(regs, -res); else pt_succ_return(regs, res); goto out_tsk; } case PTRACE_GETREGS: { struct pt_regs32 __user *pregs = (struct pt_regs32 __user *) addr; struct pt_regs *cregs = task_pt_regs(child); int rval; if (__put_user(tstate_to_psr(cregs->tstate), (&pregs->psr)) || __put_user(cregs->tpc, (&pregs->pc)) || __put_user(cregs->tnpc, (&pregs->npc)) || __put_user(cregs->y, (&pregs->y))) { pt_error_return(regs, EFAULT); goto out_tsk; } for (rval = 1; rval < 16; rval++) if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) { pt_error_return(regs, EFAULT); goto out_tsk; } pt_succ_return(regs, 0); #ifdef DEBUG_PTRACE printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]); #endif goto out_tsk; } case PTRACE_GETREGS64: { struct pt_regs __user *pregs = (struct pt_regs __user *) addr; struct pt_regs *cregs = task_pt_regs(child); unsigned long tpc = cregs->tpc; int rval; if ((task_thread_info(child)->flags & _TIF_32BIT) != 0) tpc &= 0xffffffff; if (__put_user(cregs->tstate, (&pregs->tstate)) || __put_user(tpc, (&pregs->tpc)) || __put_user(cregs->tnpc, (&pregs->tnpc)) || __put_user(cregs->y, (&pregs->y))) { pt_error_return(regs, EFAULT); goto out_tsk; } for (rval = 1; rval < 16; rval++) if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) { pt_error_return(regs, EFAULT); goto out_tsk; } pt_succ_return(regs, 0); #ifdef DEBUG_PTRACE printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]); #endif goto out_tsk; } case PTRACE_SETREGS: { struct pt_regs32 __user *pregs = (struct pt_regs32 __user *) addr; struct pt_regs *cregs = task_pt_regs(child); unsigned int psr, pc, npc, y; int i; /* Must be careful, tracing process can only set certain * bits in the psr. */ if (__get_user(psr, (&pregs->psr)) || __get_user(pc, (&pregs->pc)) || __get_user(npc, (&pregs->npc)) || __get_user(y, (&pregs->y))) { pt_error_return(regs, EFAULT); goto out_tsk; } cregs->tstate &= ~(TSTATE_ICC); cregs->tstate |= psr_to_tstate_icc(psr); if (!((pc | npc) & 3)) { cregs->tpc = pc; cregs->tnpc = npc; } cregs->y = y; for (i = 1; i < 16; i++) { if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) { pt_error_return(regs, EFAULT); goto out_tsk; } } pt_succ_return(regs, 0); goto out_tsk; } case PTRACE_SETREGS64: { struct pt_regs __user *pregs = (struct pt_regs __user *) addr; struct pt_regs *cregs = task_pt_regs(child); unsigned long tstate, tpc, tnpc, y; int i; /* Must be careful, tracing process can only set certain * bits in the psr. */ if (__get_user(tstate, (&pregs->tstate)) || __get_user(tpc, (&pregs->tpc)) || __get_user(tnpc, (&pregs->tnpc)) || __get_user(y, (&pregs->y))) { pt_error_return(regs, EFAULT); goto out_tsk; } if ((task_thread_info(child)->flags & _TIF_32BIT) != 0) { tpc &= 0xffffffff; tnpc &= 0xffffffff; } tstate &= (TSTATE_ICC | TSTATE_XCC); cregs->tstate &= ~(TSTATE_ICC | TSTATE_XCC); cregs->tstate |= tstate; if (!((tpc | tnpc) & 3)) { cregs->tpc = tpc; cregs->tnpc = tnpc; } cregs->y = y; for (i = 1; i < 16; i++) { if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) { pt_error_return(regs, EFAULT); goto out_tsk; } } pt_succ_return(regs, 0); goto out_tsk; } case PTRACE_GETFPREGS: { struct fps { unsigned int regs[32]; unsigned int fsr; unsigned int flags; unsigned int extra; unsigned int fpqd; struct fq { unsigned int insnaddr; unsigned int insn; } fpq[16]; }; struct fps __user *fps = (struct fps __user *) addr; unsigned long *fpregs = task_thread_info(child)->fpregs; if (copy_to_user(&fps->regs[0], fpregs, (32 * sizeof(unsigned int))) || __put_user(task_thread_info(child)->xfsr[0], (&fps->fsr)) || __put_user(0, (&fps->fpqd)) || __put_user(0, (&fps->flags)) || __put_user(0, (&fps->extra)) || clear_user(&fps->fpq[0], 32 * sizeof(unsigned int))) { pt_error_return(regs, EFAULT); goto out_tsk; } pt_succ_return(regs, 0); goto out_tsk; } case PTRACE_GETFPREGS64: { struct fps { unsigned int regs[64]; unsigned long fsr; }; struct fps __user *fps = (struct fps __user *) addr; unsigned long *fpregs = task_thread_info(child)->fpregs; if (copy_to_user(&fps->regs[0], fpregs, (64 * sizeof(unsigned int))) || __put_user(task_thread_info(child)->xfsr[0], (&fps->fsr))) { pt_error_return(regs, EFAULT); goto out_tsk; } pt_succ_return(regs, 0); goto out_tsk; } case PTRACE_SETFPREGS: { struct fps { unsigned int regs[32]; unsigned int fsr; unsigned int flags; unsigned int extra; unsigned int fpqd; struct fq { unsigned int insnaddr; unsigned int insn; } fpq[16]; }; struct fps __user *fps = (struct fps __user *) addr; unsigned long *fpregs = task_thread_info(child)->fpregs; unsigned fsr; if (copy_from_user(fpregs, &fps->regs[0], (32 * sizeof(unsigned int))) || __get_user(fsr, (&fps->fsr))) { pt_error_return(regs, EFAULT); goto out_tsk; } task_thread_info(child)->xfsr[0] &= 0xffffffff00000000UL; task_thread_info(child)->xfsr[0] |= fsr; if (!(task_thread_info(child)->fpsaved[0] & FPRS_FEF)) task_thread_info(child)->gsr[0] = 0; task_thread_info(child)->fpsaved[0] |= (FPRS_FEF | FPRS_DL); pt_succ_return(regs, 0); goto out_tsk; } case PTRACE_SETFPREGS64: { struct fps { unsigned int regs[64]; unsigned long fsr; }; struct fps __user *fps = (struct fps __user *) addr; unsigned long *fpregs = task_thread_info(child)->fpregs; if (copy_from_user(fpregs, &fps->regs[0], (64 * sizeof(unsigned int))) || __get_user(task_thread_info(child)->xfsr[0], (&fps->fsr))) { pt_error_return(regs, EFAULT); goto out_tsk; } if (!(task_thread_info(child)->fpsaved[0] & FPRS_FEF)) task_thread_info(child)->gsr[0] = 0; task_thread_info(child)->fpsaved[0] |= (FPRS_FEF | FPRS_DL | FPRS_DU); pt_succ_return(regs, 0); goto out_tsk; } case PTRACE_READTEXT: case PTRACE_READDATA: { int res = ptrace_readdata(child, addr, (char __user *)addr2, data); if (res == data) { pt_succ_return(regs, 0); goto out_tsk; } if (res >= 0) res = -EIO; pt_error_return(regs, -res); goto out_tsk; } case PTRACE_WRITETEXT: case PTRACE_WRITEDATA: { int res = ptrace_writedata(child, (char __user *) addr2, addr, data); if (res == data) { pt_succ_return(regs, 0); goto out_tsk; } if (res >= 0) res = -EIO; pt_error_return(regs, -res); goto out_tsk; } case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */ addr = 1; case PTRACE_CONT: { /* restart after signal. */ if (!valid_signal(data)) { pt_error_return(regs, EIO); goto out_tsk; } if (request == PTRACE_SYSCALL) { set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); } else { clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); } child->exit_code = data; #ifdef DEBUG_PTRACE printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n", child->comm, child->pid, child->exit_code, task_pt_regs(child)->tpc, task_pt_regs(child)->tnpc); #endif wake_up_process(child); pt_succ_return(regs, 0); goto out_tsk; } /* * make the child exit. Best I can do is send it a sigkill. * perhaps it should be put in the status that it wants to * exit. */ case PTRACE_KILL: { if (child->exit_state == EXIT_ZOMBIE) { /* already dead */ pt_succ_return(regs, 0); goto out_tsk; } child->exit_code = SIGKILL; wake_up_process(child); pt_succ_return(regs, 0); goto out_tsk; } case PTRACE_SUNDETACH: { /* detach a process that was attached. */ int error = ptrace_detach(child, data); if (error) { pt_error_return(regs, EIO); goto out_tsk; } pt_succ_return(regs, 0); goto out_tsk; } /* PTRACE_DUMPCORE unsupported... */ case PTRACE_GETEVENTMSG: { int err; if (test_thread_flag(TIF_32BIT)) err = put_user(child->ptrace_message, (unsigned int __user *) data); else err = put_user(child->ptrace_message, (unsigned long __user *) data); if (err) pt_error_return(regs, -err); else pt_succ_return(regs, 0); break; } default: { int err = ptrace_request(child, request, addr, data); if (err) pt_error_return(regs, -err); else pt_succ_return(regs, 0); goto out_tsk; } } out_tsk: if (child) put_task_struct(child); out: unlock_kernel(); } asmlinkage void syscall_trace(struct pt_regs *regs, int syscall_exit_p) { /* do the secure computing check first */ secure_computing(regs->u_regs[UREG_G1]); if (unlikely(current->audit_context) && syscall_exit_p) { unsigned long tstate = regs->tstate; int result = AUDITSC_SUCCESS; if (unlikely(tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) result = AUDITSC_FAILURE; audit_syscall_exit(result, regs->u_regs[UREG_I0]); } if (!(current->ptrace & PT_PTRACED)) goto out; if (!test_thread_flag(TIF_SYSCALL_TRACE)) goto out; ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0)); /* * this isn't the same as continuing with a signal, but it will do * for normal use. strace only continues with a signal if the * stopping signal is not SIGTRAP. -brl */ if (current->exit_code) { send_sig(current->exit_code, current, 1); current->exit_code = 0; } out: if (unlikely(current->audit_context) && !syscall_exit_p) audit_syscall_entry((test_thread_flag(TIF_32BIT) ? AUDIT_ARCH_SPARC : AUDIT_ARCH_SPARC64), regs->u_regs[UREG_G1], regs->u_regs[UREG_I0], regs->u_regs[UREG_I1], regs->u_regs[UREG_I2], regs->u_regs[UREG_I3]); }