diff --git a/arch/parisc/include/asm/ptrace.h b/arch/parisc/include/asm/ptrace.h index 3e94c5d85ff5..afa5333187b4 100644 --- a/arch/parisc/include/asm/ptrace.h +++ b/arch/parisc/include/asm/ptrace.h @@ -47,6 +47,16 @@ struct pt_regs { #define task_regs(task) ((struct pt_regs *) ((char *)(task) + TASK_REGS)) +#define __ARCH_WANT_COMPAT_SYS_PTRACE + +struct task_struct; +#define arch_has_single_step() 1 +void user_disable_single_step(struct task_struct *task); +void user_enable_single_step(struct task_struct *task); + +#define arch_has_block_step() 1 +void user_enable_block_step(struct task_struct *task); + /* XXX should we use iaoq[1] or iaoq[0] ? */ #define user_mode(regs) (((regs)->iaoq[0] & 3) ? 1 : 0) #define user_space(regs) (((regs)->iasq[1] != 0) ? 1 : 0) diff --git a/arch/parisc/kernel/ptrace.c b/arch/parisc/kernel/ptrace.c index 49c637970789..90904f9dfc50 100644 --- a/arch/parisc/kernel/ptrace.c +++ b/arch/parisc/kernel/ptrace.c @@ -4,6 +4,7 @@ * Copyright (C) 2000 Hewlett-Packard Co, Linuxcare Inc. * Copyright (C) 2000 Matthew Wilcox * Copyright (C) 2000 David Huggins-Daines + * Copyright (C) 2008 Helge Deller */ #include @@ -27,15 +28,149 @@ /* PSW bits we allow the debugger to modify */ #define USER_PSW_BITS (PSW_N | PSW_V | PSW_CB) -#undef DEBUG_PTRACE +/* + * Called by kernel/ptrace.c when detaching.. + * + * Make sure single step bits etc are not set. + */ +void ptrace_disable(struct task_struct *task) +{ + task->ptrace &= ~(PT_SINGLESTEP|PT_BLOCKSTEP); -#ifdef DEBUG_PTRACE -#define DBG(x...) printk(x) -#else -#define DBG(x...) -#endif + /* make sure the trap bits are not set */ + pa_psw(task)->r = 0; + pa_psw(task)->t = 0; + pa_psw(task)->h = 0; + pa_psw(task)->l = 0; +} -#ifdef CONFIG_64BIT +/* + * The following functions are called by ptrace_resume() when + * enabling or disabling single/block tracing. + */ +void user_disable_single_step(struct task_struct *task) +{ + ptrace_disable(task); +} + +void user_enable_single_step(struct task_struct *task) +{ + task->ptrace &= ~PT_BLOCKSTEP; + task->ptrace |= PT_SINGLESTEP; + + if (pa_psw(task)->n) { + struct siginfo si; + + /* Nullified, just crank over the queue. */ + task_regs(task)->iaoq[0] = task_regs(task)->iaoq[1]; + task_regs(task)->iasq[0] = task_regs(task)->iasq[1]; + task_regs(task)->iaoq[1] = task_regs(task)->iaoq[0] + 4; + pa_psw(task)->n = 0; + pa_psw(task)->x = 0; + pa_psw(task)->y = 0; + pa_psw(task)->z = 0; + pa_psw(task)->b = 0; + ptrace_disable(task); + /* Don't wake up the task, but let the + parent know something happened. */ + si.si_code = TRAP_TRACE; + si.si_addr = (void __user *) (task_regs(task)->iaoq[0] & ~3); + si.si_signo = SIGTRAP; + si.si_errno = 0; + force_sig_info(SIGTRAP, &si, task); + /* notify_parent(task, SIGCHLD); */ + return; + } + + /* Enable recovery counter traps. The recovery counter + * itself will be set to zero on a task switch. If the + * task is suspended on a syscall then the syscall return + * path will overwrite the recovery counter with a suitable + * value such that it traps once back in user space. We + * disable interrupts in the tasks PSW here also, to avoid + * interrupts while the recovery counter is decrementing. + */ + pa_psw(task)->r = 1; + pa_psw(task)->t = 0; + pa_psw(task)->h = 0; + pa_psw(task)->l = 0; +} + +void user_enable_block_step(struct task_struct *task) +{ + task->ptrace &= ~PT_SINGLESTEP; + task->ptrace |= PT_BLOCKSTEP; + + /* Enable taken branch trap. */ + pa_psw(task)->r = 0; + pa_psw(task)->t = 1; + pa_psw(task)->h = 0; + pa_psw(task)->l = 0; +} + +long arch_ptrace(struct task_struct *child, long request, long addr, long data) +{ + unsigned long tmp; + long ret = -EIO; + + switch (request) { + + /* Read the word at location addr in the USER area. For ptraced + processes, the kernel saves all regs on a syscall. */ + case PTRACE_PEEKUSR: + if ((addr & (sizeof(long)-1)) || + (unsigned long) addr >= sizeof(struct pt_regs)) + break; + tmp = *(unsigned long *) ((char *) task_regs(child) + addr); + ret = put_user(tmp, (unsigned long *) data); + break; + + /* Write the word at location addr in the USER area. This will need + to change when the kernel no longer saves all regs on a syscall. + FIXME. There is a problem at the moment in that r3-r18 are only + saved if the process is ptraced on syscall entry, and even then + those values are overwritten by actual register values on syscall + exit. */ + case PTRACE_POKEUSR: + /* Some register values written here may be ignored in + * entry.S:syscall_restore_rfi; e.g. iaoq is written with + * r31/r31+4, and not with the values in pt_regs. + */ + if (addr == PT_PSW) { + /* Allow writing to Nullify, Divide-step-correction, + * and carry/borrow bits. + * BEWARE, if you set N, and then single step, it won't + * stop on the nullified instruction. + */ + data &= USER_PSW_BITS; + task_regs(child)->gr[0] &= ~USER_PSW_BITS; + task_regs(child)->gr[0] |= data; + ret = 0; + break; + } + + if ((addr & (sizeof(long)-1)) || + (unsigned long) addr >= sizeof(struct pt_regs)) + break; + if ((addr >= PT_GR1 && addr <= PT_GR31) || + addr == PT_IAOQ0 || addr == PT_IAOQ1 || + (addr >= PT_FR0 && addr <= PT_FR31 + 4) || + addr == PT_SAR) { + *(unsigned long *) ((char *) task_regs(child) + addr) = data; + ret = 0; + } + break; + + default: + ret = ptrace_request(child, request, addr, data); + break; + } + + return ret; +} + + +#ifdef CONFIG_COMPAT /* This function is needed to translate 32 bit pt_regs offsets in to * 64 bit pt_regs offsets. For example, a 32 bit gdb under a 64 bit kernel @@ -61,106 +196,25 @@ static long translate_usr_offset(long offset) else return -1; } -#endif -/* - * Called by kernel/ptrace.c when detaching.. - * - * Make sure single step bits etc are not set. - */ -void ptrace_disable(struct task_struct *child) +long compat_arch_ptrace(struct task_struct *child, compat_long_t request, + compat_ulong_t addr, compat_ulong_t data) { - /* make sure the trap bits are not set */ - pa_psw(child)->r = 0; - pa_psw(child)->t = 0; - pa_psw(child)->h = 0; - pa_psw(child)->l = 0; -} - -long arch_ptrace(struct task_struct *child, long request, long addr, long data) -{ - long ret; -#ifdef DEBUG_PTRACE - long oaddr=addr, odata=data; -#endif + compat_uint_t tmp; + long ret = -EIO; switch (request) { - case PTRACE_PEEKTEXT: /* read word at location addr. */ - case PTRACE_PEEKDATA: { -#ifdef CONFIG_64BIT - if (__is_compat_task(child)) { - int copied; - unsigned int tmp; - addr &= 0xffffffffL; - copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0); - ret = -EIO; - if (copied != sizeof(tmp)) - goto out_tsk; - ret = put_user(tmp,(unsigned int *) data); - DBG("sys_ptrace(PEEK%s, %d, %lx, %lx) returning %ld, data %x\n", - request == PTRACE_PEEKTEXT ? "TEXT" : "DATA", - pid, oaddr, odata, ret, tmp); - } - else -#endif - ret = generic_ptrace_peekdata(child, addr, data); - goto out_tsk; - } + case PTRACE_PEEKUSR: + if (addr & (sizeof(compat_uint_t)-1)) + break; + addr = translate_usr_offset(addr); + if (addr < 0) + break; - /* when I and D space are separate, this will have to be fixed. */ - case PTRACE_POKETEXT: /* write the word at location addr. */ - case PTRACE_POKEDATA: - ret = 0; -#ifdef CONFIG_64BIT - if (__is_compat_task(child)) { - unsigned int tmp = (unsigned int)data; - DBG("sys_ptrace(POKE%s, %d, %lx, %lx)\n", - request == PTRACE_POKETEXT ? "TEXT" : "DATA", - pid, oaddr, odata); - addr &= 0xffffffffL; - if (access_process_vm(child, addr, &tmp, sizeof(tmp), 1) == sizeof(tmp)) - goto out_tsk; - } - else -#endif - { - if (access_process_vm(child, addr, &data, sizeof(data), 1) == sizeof(data)) - goto out_tsk; - } - ret = -EIO; - goto out_tsk; - - /* Read the word at location addr in the USER area. For ptraced - processes, the kernel saves all regs on a syscall. */ - case PTRACE_PEEKUSR: { - ret = -EIO; -#ifdef CONFIG_64BIT - if (__is_compat_task(child)) { - unsigned int tmp; - - if (addr & (sizeof(int)-1)) - goto out_tsk; - if ((addr = translate_usr_offset(addr)) < 0) - goto out_tsk; - - tmp = *(unsigned int *) ((char *) task_regs(child) + addr); - ret = put_user(tmp, (unsigned int *) data); - DBG("sys_ptrace(PEEKUSR, %d, %lx, %lx) returning %ld, addr %lx, data %x\n", - pid, oaddr, odata, ret, addr, tmp); - } - else -#endif - { - unsigned long tmp; - - if ((addr & (sizeof(long)-1)) || (unsigned long) addr >= sizeof(struct pt_regs)) - goto out_tsk; - tmp = *(unsigned long *) ((char *) task_regs(child) + addr); - ret = put_user(tmp, (unsigned long *) data); - } - goto out_tsk; - } + tmp = *(compat_uint_t *) ((char *) task_regs(child) + addr); + ret = put_user(tmp, (compat_uint_t *) (unsigned long) data); + break; /* Write the word at location addr in the USER area. This will need to change when the kernel no longer saves all regs on a syscall. @@ -169,185 +223,46 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) those values are overwritten by actual register values on syscall exit. */ case PTRACE_POKEUSR: - ret = -EIO; /* Some register values written here may be ignored in * entry.S:syscall_restore_rfi; e.g. iaoq is written with * r31/r31+4, and not with the values in pt_regs. */ - /* PT_PSW=0, so this is valid for 32 bit processes under 64 - * bit kernels. - */ if (addr == PT_PSW) { - /* PT_PSW=0, so this is valid for 32 bit processes - * under 64 bit kernels. - * - * Allow writing to Nullify, Divide-step-correction, - * and carry/borrow bits. - * BEWARE, if you set N, and then single step, it won't - * stop on the nullified instruction. + /* Since PT_PSW==0, it is valid for 32 bit processes + * under 64 bit kernels as well. */ - DBG("sys_ptrace(POKEUSR, %d, %lx, %lx)\n", - pid, oaddr, odata); - data &= USER_PSW_BITS; - task_regs(child)->gr[0] &= ~USER_PSW_BITS; - task_regs(child)->gr[0] |= data; - ret = 0; - goto out_tsk; - } -#ifdef CONFIG_64BIT - if (__is_compat_task(child)) { - if (addr & (sizeof(int)-1)) - goto out_tsk; - if ((addr = translate_usr_offset(addr)) < 0) - goto out_tsk; - DBG("sys_ptrace(POKEUSR, %d, %lx, %lx) addr %lx\n", - pid, oaddr, odata, addr); + ret = arch_ptrace(child, request, addr, data); + } else { + if (addr & (sizeof(compat_uint_t)-1)) + break; + addr = translate_usr_offset(addr); + if (addr < 0) + break; if (addr >= PT_FR0 && addr <= PT_FR31 + 4) { /* Special case, fp regs are 64 bits anyway */ - *(unsigned int *) ((char *) task_regs(child) + addr) = data; + *(__u64 *) ((char *) task_regs(child) + addr) = data; ret = 0; } else if ((addr >= PT_GR1+4 && addr <= PT_GR31+4) || addr == PT_IAOQ0+4 || addr == PT_IAOQ1+4 || addr == PT_SAR+4) { /* Zero the top 32 bits */ - *(unsigned int *) ((char *) task_regs(child) + addr - 4) = 0; - *(unsigned int *) ((char *) task_regs(child) + addr) = data; + *(__u32 *) ((char *) task_regs(child) + addr - 4) = 0; + *(__u32 *) ((char *) task_regs(child) + addr) = data; ret = 0; } - goto out_tsk; } - else -#endif - { - if ((addr & (sizeof(long)-1)) || (unsigned long) addr >= sizeof(struct pt_regs)) - goto out_tsk; - if ((addr >= PT_GR1 && addr <= PT_GR31) || - addr == PT_IAOQ0 || addr == PT_IAOQ1 || - (addr >= PT_FR0 && addr <= PT_FR31 + 4) || - addr == PT_SAR) { - *(unsigned long *) ((char *) task_regs(child) + addr) = data; - ret = 0; - } - goto out_tsk; - } - - case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */ - case PTRACE_CONT: - ret = -EIO; - DBG("sys_ptrace(%s)\n", - request == PTRACE_SYSCALL ? "SYSCALL" : "CONT"); - if (!valid_signal(data)) - goto out_tsk; - child->ptrace &= ~(PT_SINGLESTEP|PT_BLOCKSTEP); - 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; - goto out_wake_notrap; - - case PTRACE_KILL: - /* - * 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. - */ - ret = 0; - DBG("sys_ptrace(KILL)\n"); - if (child->exit_state == EXIT_ZOMBIE) /* already dead */ - goto out_tsk; - child->exit_code = SIGKILL; - goto out_wake_notrap; - - case PTRACE_SINGLEBLOCK: - DBG("sys_ptrace(SINGLEBLOCK)\n"); - ret = -EIO; - if (!valid_signal(data)) - goto out_tsk; - clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); - child->ptrace &= ~PT_SINGLESTEP; - child->ptrace |= PT_BLOCKSTEP; - child->exit_code = data; - - /* Enable taken branch trap. */ - pa_psw(child)->r = 0; - pa_psw(child)->t = 1; - pa_psw(child)->h = 0; - pa_psw(child)->l = 0; - goto out_wake; - - case PTRACE_SINGLESTEP: - DBG("sys_ptrace(SINGLESTEP)\n"); - ret = -EIO; - if (!valid_signal(data)) - goto out_tsk; - - clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); - child->ptrace &= ~PT_BLOCKSTEP; - child->ptrace |= PT_SINGLESTEP; - child->exit_code = data; - - if (pa_psw(child)->n) { - struct siginfo si; - - /* Nullified, just crank over the queue. */ - task_regs(child)->iaoq[0] = task_regs(child)->iaoq[1]; - task_regs(child)->iasq[0] = task_regs(child)->iasq[1]; - task_regs(child)->iaoq[1] = task_regs(child)->iaoq[0] + 4; - pa_psw(child)->n = 0; - pa_psw(child)->x = 0; - pa_psw(child)->y = 0; - pa_psw(child)->z = 0; - pa_psw(child)->b = 0; - ptrace_disable(child); - /* Don't wake up the child, but let the - parent know something happened. */ - si.si_code = TRAP_TRACE; - si.si_addr = (void __user *) (task_regs(child)->iaoq[0] & ~3); - si.si_signo = SIGTRAP; - si.si_errno = 0; - force_sig_info(SIGTRAP, &si, child); - //notify_parent(child, SIGCHLD); - //ret = 0; - goto out_wake; - } - - /* Enable recovery counter traps. The recovery counter - * itself will be set to zero on a task switch. If the - * task is suspended on a syscall then the syscall return - * path will overwrite the recovery counter with a suitable - * value such that it traps once back in user space. We - * disable interrupts in the childs PSW here also, to avoid - * interrupts while the recovery counter is decrementing. - */ - pa_psw(child)->r = 1; - pa_psw(child)->t = 0; - pa_psw(child)->h = 0; - pa_psw(child)->l = 0; - /* give it a chance to run. */ - goto out_wake; - - case PTRACE_GETEVENTMSG: - ret = put_user(child->ptrace_message, (unsigned int __user *) data); - goto out_tsk; + break; default: - ret = ptrace_request(child, request, addr, data); - goto out_tsk; + ret = compat_ptrace_request(child, request, addr, data); + break; } -out_wake_notrap: - ptrace_disable(child); -out_wake: - wake_up_process(child); - ret = 0; -out_tsk: - DBG("arch_ptrace(%ld, %d, %lx, %lx) returning %ld\n", - request, pid, oaddr, odata, ret); return ret; } +#endif + void syscall_trace(void) { diff --git a/arch/parisc/kernel/syscall_table.S b/arch/parisc/kernel/syscall_table.S index 6084667eacf9..4ed01f2d655d 100644 --- a/arch/parisc/kernel/syscall_table.S +++ b/arch/parisc/kernel/syscall_table.S @@ -87,7 +87,7 @@ ENTRY_SAME(setuid) ENTRY_SAME(getuid) ENTRY_COMP(stime) /* 25 */ - ENTRY_SAME(ptrace) + ENTRY_COMP(ptrace) ENTRY_SAME(alarm) /* see stat comment */ ENTRY_COMP(newfstat)