x86: x86 ia32 ptrace arch merge

This moves the sys32_ptrace code into arch/x86/kernel/ptrace.c,
verbatim except for a few hard-coded sizes replaced with sizeof.
Here this code can use the shared local functions in this file.

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 214 insertions, 0 deletions

diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index d56aa18309f8..3399c1be79b8 100644
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -636,6 +636,10 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 
 #ifdef CONFIG_IA32_EMULATION
 
+#include <linux/compat.h>
+#include <linux/syscalls.h>
+#include <asm/ia32.h>
+#include <asm/fpu32.h>
 #include <asm/user32.h>
 
 #define R32(l,q)                                                        \
@@ -758,6 +762,216 @@ static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
 #undef R32
 #undef SEG32
 
+static long ptrace32_siginfo(unsigned request, u32 pid, u32 addr, u32 data)
+{
+        siginfo_t __user *si = compat_alloc_user_space(sizeof(siginfo_t));
+        compat_siginfo_t __user *si32 = compat_ptr(data);
+        siginfo_t ssi;
+        int ret;
+
+        if (request == PTRACE_SETSIGINFO) {
+                memset(&ssi, 0, sizeof(siginfo_t));
+                ret = copy_siginfo_from_user32(&ssi, si32);
+                if (ret)
+                        return ret;
+                if (copy_to_user(si, &ssi, sizeof(siginfo_t)))
+                        return -EFAULT;
+        }
+        ret = sys_ptrace(request, pid, addr, (unsigned long)si);
+        if (ret)
+                return ret;
+        if (request == PTRACE_GETSIGINFO) {
+                if (copy_from_user(&ssi, si, sizeof(siginfo_t)))
+                        return -EFAULT;
+                ret = copy_siginfo_to_user32(si32, &ssi);
+        }
+        return ret;
+}
+
+asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data)
+{
+        struct task_struct *child;
+        struct pt_regs *childregs;
+        void __user *datap = compat_ptr(data);
+        int ret;
+        __u32 val;
+
+        switch (request) {
+        case PTRACE_TRACEME:
+        case PTRACE_ATTACH:
+        case PTRACE_KILL:
+        case PTRACE_CONT:
+        case PTRACE_SINGLESTEP:
+        case PTRACE_SINGLEBLOCK:
+        case PTRACE_DETACH:
+        case PTRACE_SYSCALL:
+        case PTRACE_OLDSETOPTIONS:
+        case PTRACE_SETOPTIONS:
+        case PTRACE_SET_THREAD_AREA:
+        case PTRACE_GET_THREAD_AREA:
+                return sys_ptrace(request, pid, addr, data);
+
+        default:
+                return -EINVAL;
+
+        case PTRACE_PEEKTEXT:
+        case PTRACE_PEEKDATA:
+        case PTRACE_POKEDATA:
+        case PTRACE_POKETEXT:
+        case PTRACE_POKEUSR:
+        case PTRACE_PEEKUSR:
+        case PTRACE_GETREGS:
+        case PTRACE_SETREGS:
+        case PTRACE_SETFPREGS:
+        case PTRACE_GETFPREGS:
+        case PTRACE_SETFPXREGS:
+        case PTRACE_GETFPXREGS:
+        case PTRACE_GETEVENTMSG:
+                break;
+
+        case PTRACE_SETSIGINFO:
+        case PTRACE_GETSIGINFO:
+                return ptrace32_siginfo(request, pid, addr, data);
+        }
+
+        child = ptrace_get_task_struct(pid);
+        if (IS_ERR(child))
+                return PTR_ERR(child);
+
+        ret = ptrace_check_attach(child, request == PTRACE_KILL);
+        if (ret < 0)
+                goto out;
+
+        childregs = task_pt_regs(child);
+
+        switch (request) {
+        case PTRACE_PEEKDATA:
+        case PTRACE_PEEKTEXT:
+                ret = 0;
+                if (access_process_vm(child, addr, &val, sizeof(u32), 0) !=
+                    sizeof(u32))
+                        ret = -EIO;
+                else
+                        ret = put_user(val, (unsigned int __user *)datap);
+                break;
+
+        case PTRACE_POKEDATA:
+        case PTRACE_POKETEXT:
+                ret = 0;
+                if (access_process_vm(child, addr, &data, sizeof(u32), 1) !=
+                    sizeof(u32))
+                        ret = -EIO;
+                break;
+
+        case PTRACE_PEEKUSR:
+                ret = getreg32(child, addr, &val);
+                if (ret == 0)
+                        ret = put_user(val, (__u32 __user *)datap);
+                break;
+
+        case PTRACE_POKEUSR:
+                ret = putreg32(child, addr, data);
+                break;
+
+        case PTRACE_GETREGS: { /* Get all gp regs from the child. */
+                int i;
+
+                if (!access_ok(VERIFY_WRITE, datap, 16*4)) {
+                        ret = -EIO;
+                        break;
+                }
+                ret = 0;
+                for (i = 0; i < sizeof(struct user_regs_struct32); i += sizeof(__u32)) {
+                        getreg32(child, i, &val);
+                        ret |= __put_user(val, (u32 __user *)datap);
+                        datap += sizeof(u32);
+                }
+                break;
+        }
+
+        case PTRACE_SETREGS: { /* Set all gp regs in the child. */
+                unsigned long tmp;
+                int i;
+
+                if (!access_ok(VERIFY_READ, datap, 16*4)) {
+                        ret = -EIO;
+                        break;
+                }
+                ret = 0;
+                for (i = 0; i < sizeof(struct user_regs_struct32); i += sizeof(u32)) {
+                        ret |= __get_user(tmp, (u32 __user *)datap);
+                        putreg32(child, i, tmp);
+                        datap += sizeof(u32);
+                }
+                break;
+        }
+
+        case PTRACE_GETFPREGS:
+                ret = -EIO;
+                if (!access_ok(VERIFY_READ, compat_ptr(data),
+                               sizeof(struct user_i387_struct)))
+                        break;
+                save_i387_ia32(child, datap, childregs, 1);
+                ret = 0;
+                        break;
+
+        case PTRACE_SETFPREGS:
+                ret = -EIO;
+                if (!access_ok(VERIFY_WRITE, datap,
+                               sizeof(struct user_i387_struct)))
+                        break;
+                ret = 0;
+                /* don't check EFAULT to be bug-to-bug compatible to i386 */
+                restore_i387_ia32(child, datap, 1);
+                break;
+
+        case PTRACE_GETFPXREGS: {
+                struct user32_fxsr_struct __user *u = datap;
+
+                init_fpu(child);
+                ret = -EIO;
+                if (!access_ok(VERIFY_WRITE, u, sizeof(*u)))
+                        break;
+                        ret = -EFAULT;
+                if (__copy_to_user(u, &child->thread.i387.fxsave, sizeof(*u)))
+                        break;
+                ret = __put_user(childregs->cs, &u->fcs);
+                ret |= __put_user(child->thread.ds, &u->fos);
+                break;
+        }
+        case PTRACE_SETFPXREGS: {
+                struct user32_fxsr_struct __user *u = datap;
+
+                unlazy_fpu(child);
+                ret = -EIO;
+                if (!access_ok(VERIFY_READ, u, sizeof(*u)))
+                        break;
+                /*
+                 * no checking to be bug-to-bug compatible with i386.
+                 * but silence warning
+                 */
+                if (__copy_from_user(&child->thread.i387.fxsave, u, sizeof(*u)))
+                        ;
+                set_stopped_child_used_math(child);
+                child->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask;
+                ret = 0;
+                break;
+        }
+
+        case PTRACE_GETEVENTMSG:
+                ret = put_user(child->ptrace_message,
+                               (unsigned int __user *)compat_ptr(data));
+                break;
+
+        default:
+                BUG();
+        }
+
+ out:
+        put_task_struct(child);
+        return ret;
+}
+
 #endif  /* CONFIG_IA32_EMULATION */
 
 #ifdef CONFIG_X86_32