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author | David S. Miller <davem@davemloft.net> | 2008-02-07 03:00:17 -0800 |
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committer | David S. Miller <davem@davemloft.net> | 2008-02-07 03:00:17 -0800 |
commit | 9775369ec06bad8edb2fbd8c77316f49b439c225 (patch) | |
tree | 14b0cb23d5fad3dbd99da0e21cf1b7e3db92595f /arch/sparc/kernel/ptrace.c | |
parent | 190aa9f60f9575d1b7382cd1ee33e2589208c514 (diff) | |
download | kernel_samsung_smdk4412-9775369ec06bad8edb2fbd8c77316f49b439c225.zip kernel_samsung_smdk4412-9775369ec06bad8edb2fbd8c77316f49b439c225.tar.gz kernel_samsung_smdk4412-9775369ec06bad8edb2fbd8c77316f49b439c225.tar.bz2 |
[SPARC]: Move over to arch_ptrace().
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/kernel/ptrace.c')
-rw-r--r-- | arch/sparc/kernel/ptrace.c | 462 |
1 files changed, 63 insertions, 399 deletions
diff --git a/arch/sparc/kernel/ptrace.c b/arch/sparc/kernel/ptrace.c index 29fa6e5..1c0d536 100644 --- a/arch/sparc/kernel/ptrace.c +++ b/arch/sparc/kernel/ptrace.c @@ -26,215 +26,6 @@ #include <asm/system.h> #include <asm/uaccess.h> -#define MAGIC_CONSTANT 0x80000000 - - -/* 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->psr |= PSR_C; - regs->pc = regs->npc; - regs->npc += 4; -} - -static inline void pt_succ_return(struct pt_regs *regs, unsigned long value) -{ - regs->u_regs[UREG_I0] = value; - regs->psr &= ~PSR_C; - regs->pc = regs->npc; - regs->npc += 4; -} - -static void -pt_succ_return_linux(struct pt_regs *regs, unsigned long value, long __user *addr) -{ - if (put_user(value, addr)) { - pt_error_return(regs, EFAULT); - return; - } - regs->u_regs[UREG_I0] = 0; - regs->psr &= ~PSR_C; - regs->pc = regs->npc; - regs->npc += 4; -} - -static void -pt_os_succ_return (struct pt_regs *regs, unsigned long val, long __user *addr) -{ - if (current->personality == PER_SUNOS) - pt_succ_return (regs, val); - else - pt_succ_return_linux (regs, val, addr); -} - -/* Fuck me gently with a chainsaw... */ -static inline void read_sunos_user(struct pt_regs *regs, unsigned long offset, - struct task_struct *tsk, long __user *addr) -{ - struct pt_regs *cregs = tsk->thread.kregs; - struct thread_info *t = task_thread_info(tsk); - int v; - - if(offset >= 1024) - offset -= 1024; /* whee... */ - if(offset & ((sizeof(unsigned long) - 1))) { - pt_error_return(regs, EIO); - return; - } - if(offset >= 16 && offset < 784) { - offset -= 16; offset >>= 2; - pt_os_succ_return(regs, *(((unsigned long *)(&t->reg_window[0]))+offset), addr); - return; - } - if(offset >= 784 && offset < 832) { - offset -= 784; offset >>= 2; - pt_os_succ_return(regs, *(((unsigned long *)(&t->rwbuf_stkptrs[0]))+offset), addr); - return; - } - switch(offset) { - case 0: - v = t->ksp; - break; - case 4: - v = t->kpc; - break; - case 8: - v = t->kpsr; - break; - case 12: - v = t->uwinmask; - break; - case 832: - v = t->w_saved; - break; - case 896: - v = cregs->u_regs[UREG_I0]; - break; - case 900: - v = cregs->u_regs[UREG_I1]; - break; - case 904: - v = cregs->u_regs[UREG_I2]; - break; - case 908: - v = cregs->u_regs[UREG_I3]; - break; - case 912: - v = cregs->u_regs[UREG_I4]; - break; - case 916: - v = cregs->u_regs[UREG_I5]; - break; - case 920: - v = cregs->u_regs[UREG_I6]; - break; - case 924: - if(tsk->thread.flags & MAGIC_CONSTANT) - v = cregs->u_regs[UREG_G1]; - else - v = 0; - break; - case 940: - v = cregs->u_regs[UREG_I0]; - break; - case 944: - v = cregs->u_regs[UREG_I1]; - break; - - case 948: - /* Isn't binary compatibility _fun_??? */ - if(cregs->psr & PSR_C) - v = cregs->u_regs[UREG_I0] << 24; - else - v = 0; - break; - - /* Rest of them are completely unsupported. */ - default: - printk("%s [%d]: Wants to read user offset %ld\n", - current->comm, task_pid_nr(current), offset); - pt_error_return(regs, EIO); - return; - } - if (current->personality == PER_SUNOS) - pt_succ_return (regs, v); - else - pt_succ_return_linux (regs, v, addr); - return; -} - -static inline void write_sunos_user(struct pt_regs *regs, unsigned long offset, - struct task_struct *tsk) -{ - struct pt_regs *cregs = tsk->thread.kregs; - struct thread_info *t = task_thread_info(tsk); - unsigned long value = regs->u_regs[UREG_I3]; - - if(offset >= 1024) - offset -= 1024; /* whee... */ - if(offset & ((sizeof(unsigned long) - 1))) - goto failure; - if(offset >= 16 && offset < 784) { - offset -= 16; offset >>= 2; - *(((unsigned long *)(&t->reg_window[0]))+offset) = value; - goto success; - } - if(offset >= 784 && offset < 832) { - offset -= 784; offset >>= 2; - *(((unsigned long *)(&t->rwbuf_stkptrs[0]))+offset) = value; - goto success; - } - switch(offset) { - case 896: - cregs->u_regs[UREG_I0] = value; - break; - case 900: - cregs->u_regs[UREG_I1] = value; - break; - case 904: - cregs->u_regs[UREG_I2] = value; - break; - case 908: - cregs->u_regs[UREG_I3] = value; - break; - case 912: - cregs->u_regs[UREG_I4] = value; - break; - case 916: - cregs->u_regs[UREG_I5] = value; - break; - case 920: - cregs->u_regs[UREG_I6] = value; - break; - case 924: - cregs->u_regs[UREG_I7] = value; - break; - case 940: - cregs->u_regs[UREG_I0] = value; - break; - case 944: - cregs->u_regs[UREG_I1] = value; - break; - - /* Rest of them are completely unsupported or "no-touch". */ - default: - printk("%s [%d]: Wants to write user offset %ld\n", - current->comm, task_pid_nr(current), offset); - goto failure; - } -success: - pt_succ_return(regs, 0); - return; -failure: - pt_error_return(regs, EIO); - return; -} - /* #define ALLOW_INIT_TRACING */ /* @@ -528,113 +319,42 @@ const struct user_regset_view *task_user_regset_view(struct task_struct *task) return &user_sparc32_view; } -asmlinkage void do_ptrace(struct pt_regs *regs) +long arch_ptrace(struct task_struct *child, long request, long addr, long data) { - unsigned long request = regs->u_regs[UREG_I0]; - unsigned long 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; - - lock_kernel(); - - if (request == PTRACE_TRACEME) { - ret = ptrace_traceme(); - if (ret < 0) - pt_error_return(regs, -ret); - else - 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 (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; - } + unsigned long addr2 = current->thread.kregs->u_regs[UREG_I4]; + int i, ret; switch(request) { - case PTRACE_PEEKTEXT: /* read word at location addr. */ - case PTRACE_PEEKDATA: { - unsigned long tmp; - - if (access_process_vm(child, addr, - &tmp, sizeof(tmp), 0) == sizeof(tmp)) - pt_os_succ_return(regs, tmp, (long __user *)data); - else - pt_error_return(regs, EIO); - goto out_tsk; - } - - case PTRACE_PEEKUSR: - read_sunos_user(regs, addr, child, (long __user *) data); - goto out_tsk; - - case PTRACE_POKEUSR: - write_sunos_user(regs, addr, child); - goto out_tsk; - - case PTRACE_POKETEXT: /* write the word at location addr. */ - case PTRACE_POKEDATA: { - if (access_process_vm(child, addr, - &data, sizeof(data), 1) == sizeof(data)) - pt_succ_return(regs, 0); - else - pt_error_return(regs, EIO); - goto out_tsk; - } - case PTRACE_GETREGS: { struct pt_regs __user *pregs = (struct pt_regs __user *) addr; struct pt_regs *cregs = child->thread.kregs; - int rval; - if (!access_ok(VERIFY_WRITE, pregs, sizeof(struct pt_regs))) { - rval = -EFAULT; - pt_error_return(regs, -rval); - goto out_tsk; - } + ret = -EFAULT; + if (!access_ok(VERIFY_WRITE, pregs, sizeof(struct pt_regs))) + break; + __put_user(cregs->psr, (&pregs->psr)); __put_user(cregs->pc, (&pregs->pc)); __put_user(cregs->npc, (&pregs->npc)); __put_user(cregs->y, (&pregs->y)); - for(rval = 1; rval < 16; rval++) - __put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1])); - pt_succ_return(regs, 0); - goto out_tsk; + for (i = 1; i < 16; i++) + __put_user(cregs->u_regs[i], &pregs->u_regs[i - 1]); + ret = 0; + break; } case PTRACE_SETREGS: { struct pt_regs __user *pregs = (struct pt_regs __user *) addr; struct pt_regs *cregs = child->thread.kregs; unsigned long psr, pc, npc, y; - int i; /* Must be careful, tracing process can only set certain * bits in the psr. */ - if (!access_ok(VERIFY_READ, pregs, sizeof(struct pt_regs))) { - pt_error_return(regs, EFAULT); - goto out_tsk; - } + ret = -EFAULT; + if (!access_ok(VERIFY_READ, pregs, sizeof(struct pt_regs))) + break; + __get_user(psr, (&pregs->psr)); __get_user(pc, (&pregs->pc)); __get_user(npc, (&pregs->npc)); @@ -647,10 +367,10 @@ asmlinkage void do_ptrace(struct pt_regs *regs) cregs->npc =npc; } cregs->y = y; - for(i = 1; i < 16; i++) - __get_user(cregs->u_regs[i], (&pregs->u_regs[i-1])); - pt_succ_return(regs, 0); - goto out_tsk; + for (i = 1; i < 16; i++) + __get_user(cregs->u_regs[i], &pregs->u_regs[i-1]); + ret = 0; + break; } case PTRACE_GETFPREGS: { @@ -666,26 +386,25 @@ asmlinkage void do_ptrace(struct pt_regs *regs) } fpq[16]; }; struct fps __user *fps = (struct fps __user *) addr; - int i; - if (!access_ok(VERIFY_WRITE, fps, sizeof(struct fps))) { - i = -EFAULT; - pt_error_return(regs, -i); - goto out_tsk; - } - for(i = 0; i < 32; i++) - __put_user(child->thread.float_regs[i], (&fps->regs[i])); + ret = -EFAULT; + if (!access_ok(VERIFY_WRITE, fps, sizeof(struct fps))) + break; + + for (i = 0; i < 32; i++) + __put_user(child->thread.float_regs[i], &fps->regs[i]); __put_user(child->thread.fsr, (&fps->fsr)); __put_user(child->thread.fpqdepth, (&fps->fpqd)); __put_user(0, (&fps->flags)); __put_user(0, (&fps->extra)); - for(i = 0; i < 16; i++) { + for (i = 0; i < 16; i++) { __put_user(child->thread.fpqueue[i].insn_addr, (&fps->fpq[i].insnaddr)); - __put_user(child->thread.fpqueue[i].insn, (&fps->fpq[i].insn)); + __put_user(child->thread.fpqueue[i].insn, + &fps->fpq[i].insn); } - pt_succ_return(regs, 0); - goto out_tsk; + ret = 0; + break; } case PTRACE_SETFPREGS: { @@ -701,107 +420,53 @@ asmlinkage void do_ptrace(struct pt_regs *regs) } fpq[16]; }; struct fps __user *fps = (struct fps __user *) addr; - int i; - if (!access_ok(VERIFY_READ, fps, sizeof(struct fps))) { - i = -EFAULT; - pt_error_return(regs, -i); - goto out_tsk; - } - copy_from_user(&child->thread.float_regs[0], &fps->regs[0], (32 * sizeof(unsigned long))); + ret = -EFAULT; + if (!access_ok(VERIFY_READ, fps, sizeof(struct fps))) + break; + + copy_from_user(&child->thread.float_regs[0], &fps->regs[0], + (32 * sizeof(unsigned long))); __get_user(child->thread.fsr, (&fps->fsr)); __get_user(child->thread.fpqdepth, (&fps->fpqd)); - for(i = 0; i < 16; i++) { + for (i = 0; i < 16; i++) { __get_user(child->thread.fpqueue[i].insn_addr, (&fps->fpq[i].insnaddr)); - __get_user(child->thread.fpqueue[i].insn, (&fps->fpq[i].insn)); + __get_user(child->thread.fpqueue[i].insn, + &fps->fpq[i].insn); } - pt_succ_return(regs, 0); - goto out_tsk; + ret = 0; + break; } case PTRACE_READTEXT: - case PTRACE_READDATA: { - int res = ptrace_readdata(child, addr, - (void __user *) addr2, data); - - if (res == data) { - pt_succ_return(regs, 0); - goto out_tsk; - } - /* Partial read is an IO failure */ - if (res >= 0) - res = -EIO; - pt_error_return(regs, -res); - goto out_tsk; - } + case PTRACE_READDATA: + ret = ptrace_readdata(child, addr, + (void __user *) addr2, data); + + if (ret == data) + ret = 0; + else if (ret >= 0) + ret = -EIO; + break; case PTRACE_WRITETEXT: - case PTRACE_WRITEDATA: { - int res = ptrace_writedata(child, (void __user *) addr2, - addr, data); - - if (res == data) { - pt_succ_return(regs, 0); - goto out_tsk; - } - /* Partial write is an IO failure */ - 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; - wake_up_process(child); - pt_succ_return(regs, 0); - goto out_tsk; - } + case PTRACE_WRITEDATA: + ret = ptrace_writedata(child, (void __user *) addr2, + addr, data); + + if (ret == data) + ret = 0; + else if (ret >= 0) + ret = -EIO; + break; -/* - * 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; - } - wake_up_process(child); - child->exit_code = SIGKILL; - pt_succ_return(regs, 0); - goto out_tsk; + default: + ret = ptrace_request(child, request, addr, data); + 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(); + return ret; } asmlinkage void syscall_trace(void) @@ -810,7 +475,6 @@ asmlinkage void syscall_trace(void) return; if (!(current->ptrace & PT_PTRACED)) return; - current->thread.flags ^= MAGIC_CONSTANT; ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0)); /* |