Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 415 insertions, 0 deletions

diff --git a/arch/alpha/kernel/ptrace.c b/arch/alpha/kernel/ptrace.c
new file mode 100644
index 000000000000..d00583161574
--- /dev/null
+++ b/arch/alpha/kernel/ptrace.c
@@ -0,0 +1,415 @@
+/* ptrace.c */
+/* By Ross Biro 1/23/92 */
+/* edited by Linus Torvalds */
+/* mangled further by Bob Manson (manson@santafe.edu) */
+/* more mutilation by David Mosberger (davidm@azstarnet.com) */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/errno.h>
+#include <linux/ptrace.h>
+#include <linux/user.h>
+#include <linux/slab.h>
+#include <linux/security.h>
+
+#include <asm/uaccess.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/fpu.h>
+
+#include "proto.h"
+
+#define DEBUG   DBG_MEM
+#undef DEBUG
+
+#ifdef DEBUG
+enum {
+        DBG_MEM         = (1<<0),
+        DBG_BPT         = (1<<1),
+        DBG_MEM_ALL     = (1<<2)
+};
+#define DBG(fac,args)   {if ((fac) & DEBUG) printk args;}
+#else
+#define DBG(fac,args)
+#endif
+
+#define BREAKINST       0x00000080      /* call_pal bpt */
+
+/*
+ * does not yet catch signals sent when the child dies.
+ * in exit.c or in signal.c.
+ */
+
+/*
+ * Processes always block with the following stack-layout:
+ *
+ *  +================================+ <---- task + 2*PAGE_SIZE
+ *  | PALcode saved frame (ps, pc,   | ^
+ *  | gp, a0, a1, a2)                | |
+ *  +================================+ | struct pt_regs
+ *  |                                | |
+ *  | frame generated by SAVE_ALL    | |
+ *  |                                | v
+ *  +================================+
+ *  |                                | ^
+ *  | frame saved by do_switch_stack | | struct switch_stack
+ *  |                                | v
+ *  +================================+
+ */
+
+/* 
+ * The following table maps a register index into the stack offset at
+ * which the register is saved.  Register indices are 0-31 for integer
+ * regs, 32-63 for fp regs, and 64 for the pc.  Notice that sp and
+ * zero have no stack-slot and need to be treated specially (see
+ * get_reg/put_reg below).
+ */
+enum {
+        REG_R0 = 0, REG_F0 = 32, REG_FPCR = 63, REG_PC = 64
+};
+
+static int regoff[] = {
+        PT_REG(    r0), PT_REG(    r1), PT_REG(    r2), PT_REG(   r3),
+        PT_REG(    r4), PT_REG(    r5), PT_REG(    r6), PT_REG(   r7),
+        PT_REG(    r8), SW_REG(    r9), SW_REG(   r10), SW_REG(  r11),
+        SW_REG(   r12), SW_REG(   r13), SW_REG(   r14), SW_REG(  r15),
+        PT_REG(   r16), PT_REG(   r17), PT_REG(   r18), PT_REG(  r19),
+        PT_REG(   r20), PT_REG(   r21), PT_REG(   r22), PT_REG(  r23),
+        PT_REG(   r24), PT_REG(   r25), PT_REG(   r26), PT_REG(  r27),
+        PT_REG(   r28), PT_REG(    gp),            -1,             -1,
+        SW_REG(fp[ 0]), SW_REG(fp[ 1]), SW_REG(fp[ 2]), SW_REG(fp[ 3]),
+        SW_REG(fp[ 4]), SW_REG(fp[ 5]), SW_REG(fp[ 6]), SW_REG(fp[ 7]),
+        SW_REG(fp[ 8]), SW_REG(fp[ 9]), SW_REG(fp[10]), SW_REG(fp[11]),
+        SW_REG(fp[12]), SW_REG(fp[13]), SW_REG(fp[14]), SW_REG(fp[15]),
+        SW_REG(fp[16]), SW_REG(fp[17]), SW_REG(fp[18]), SW_REG(fp[19]),
+        SW_REG(fp[20]), SW_REG(fp[21]), SW_REG(fp[22]), SW_REG(fp[23]),
+        SW_REG(fp[24]), SW_REG(fp[25]), SW_REG(fp[26]), SW_REG(fp[27]),
+        SW_REG(fp[28]), SW_REG(fp[29]), SW_REG(fp[30]), SW_REG(fp[31]),
+        PT_REG(    pc)
+};
+
+static unsigned long zero;
+
+/*
+ * Get address of register REGNO in task TASK.
+ */
+static unsigned long *
+get_reg_addr(struct task_struct * task, unsigned long regno)
+{
+        unsigned long *addr;
+
+        if (regno == 30) {
+                addr = &task->thread_info->pcb.usp;
+        } else if (regno == 65) {
+                addr = &task->thread_info->pcb.unique;
+        } else if (regno == 31 || regno > 65) {
+                zero = 0;
+                addr = &zero;
+        } else {
+                addr = (void *)task->thread_info + regoff[regno];
+        }
+        return addr;
+}
+
+/*
+ * Get contents of register REGNO in task TASK.
+ */
+static unsigned long
+get_reg(struct task_struct * task, unsigned long regno)
+{
+        /* Special hack for fpcr -- combine hardware and software bits.  */
+        if (regno == 63) {
+                unsigned long fpcr = *get_reg_addr(task, regno);
+                unsigned long swcr
+                  = task->thread_info->ieee_state & IEEE_SW_MASK;
+                swcr = swcr_update_status(swcr, fpcr);
+                return fpcr | swcr;
+        }
+        return *get_reg_addr(task, regno);
+}
+
+/*
+ * Write contents of register REGNO in task TASK.
+ */
+static int
+put_reg(struct task_struct *task, unsigned long regno, unsigned long data)
+{
+        if (regno == 63) {
+                task->thread_info->ieee_state
+                  = ((task->thread_info->ieee_state & ~IEEE_SW_MASK)
+                     | (data & IEEE_SW_MASK));
+                data = (data & FPCR_DYN_MASK) | ieee_swcr_to_fpcr(data);
+        }
+        *get_reg_addr(task, regno) = data;
+        return 0;
+}
+
+static inline int
+read_int(struct task_struct *task, unsigned long addr, int * data)
+{
+        int copied = access_process_vm(task, addr, data, sizeof(int), 0);
+        return (copied == sizeof(int)) ? 0 : -EIO;
+}
+
+static inline int
+write_int(struct task_struct *task, unsigned long addr, int data)
+{
+        int copied = access_process_vm(task, addr, &data, sizeof(int), 1);
+        return (copied == sizeof(int)) ? 0 : -EIO;
+}
+
+/*
+ * Set breakpoint.
+ */
+int
+ptrace_set_bpt(struct task_struct * child)
+{
+        int displ, i, res, reg_b, nsaved = 0;
+        unsigned int insn, op_code;
+        unsigned long pc;
+
+        pc  = get_reg(child, REG_PC);
+        res = read_int(child, pc, (int *) &insn);
+        if (res < 0)
+                return res;
+
+        op_code = insn >> 26;
+        if (op_code >= 0x30) {
+                /*
+                 * It's a branch: instead of trying to figure out
+                 * whether the branch will be taken or not, we'll put
+                 * a breakpoint at either location.  This is simpler,
+                 * more reliable, and probably not a whole lot slower
+                 * than the alternative approach of emulating the
+                 * branch (emulation can be tricky for fp branches).
+                 */
+                displ = ((s32)(insn << 11)) >> 9;
+                child->thread_info->bpt_addr[nsaved++] = pc + 4;
+                if (displ)              /* guard against unoptimized code */
+                        child->thread_info->bpt_addr[nsaved++]
+                          = pc + 4 + displ;
+                DBG(DBG_BPT, ("execing branch\n"));
+        } else if (op_code == 0x1a) {
+                reg_b = (insn >> 16) & 0x1f;
+                child->thread_info->bpt_addr[nsaved++] = get_reg(child, reg_b);
+                DBG(DBG_BPT, ("execing jump\n"));
+        } else {
+                child->thread_info->bpt_addr[nsaved++] = pc + 4;
+                DBG(DBG_BPT, ("execing normal insn\n"));
+        }
+
+        /* install breakpoints: */
+        for (i = 0; i < nsaved; ++i) {
+                res = read_int(child, child->thread_info->bpt_addr[i],
+                               (int *) &insn);
+                if (res < 0)
+                        return res;
+                child->thread_info->bpt_insn[i] = insn;
+                DBG(DBG_BPT, ("    -> next_pc=%lx\n",
+                              child->thread_info->bpt_addr[i]));
+                res = write_int(child, child->thread_info->bpt_addr[i],
+                                BREAKINST);
+                if (res < 0)
+                        return res;
+        }
+        child->thread_info->bpt_nsaved = nsaved;
+        return 0;
+}
+
+/*
+ * Ensure no single-step breakpoint is pending.  Returns non-zero
+ * value if child was being single-stepped.
+ */
+int
+ptrace_cancel_bpt(struct task_struct * child)
+{
+        int i, nsaved = child->thread_info->bpt_nsaved;
+
+        child->thread_info->bpt_nsaved = 0;
+
+        if (nsaved > 2) {
+                printk("ptrace_cancel_bpt: bogus nsaved: %d!\n", nsaved);
+                nsaved = 2;
+        }
+
+        for (i = 0; i < nsaved; ++i) {
+                write_int(child, child->thread_info->bpt_addr[i],
+                          child->thread_info->bpt_insn[i]);
+        }
+        return (nsaved != 0);
+}
+
+/*
+ * Called by kernel/ptrace.c when detaching..
+ *
+ * Make sure the single step bit is not set.
+ */
+void ptrace_disable(struct task_struct *child)
+{ 
+        ptrace_cancel_bpt(child);
+}
+
+asmlinkage long
+do_sys_ptrace(long request, long pid, long addr, long data,
+              struct pt_regs *regs)
+{
+        struct task_struct *child;
+        unsigned long tmp;
+        size_t copied;
+        long ret;
+
+        lock_kernel();
+        DBG(DBG_MEM, ("request=%ld pid=%ld addr=0x%lx data=0x%lx\n",
+                      request, pid, addr, data));
+        ret = -EPERM;
+        if (request == PTRACE_TRACEME) {
+                /* are we already being traced? */
+                if (current->ptrace & PT_PTRACED)
+                        goto out_notsk;
+                ret = security_ptrace(current->parent, current);
+                if (ret)
+                        goto out_notsk;
+                /* set the ptrace bit in the process ptrace flags. */
+                current->ptrace |= PT_PTRACED;
+                ret = 0;
+                goto out_notsk;
+        }
+        if (pid == 1)           /* you may not mess with init */
+                goto out_notsk;
+
+        ret = -ESRCH;
+        read_lock(&tasklist_lock);
+        child = find_task_by_pid(pid);
+        if (child)
+                get_task_struct(child);
+        read_unlock(&tasklist_lock);
+        if (!child)
+                goto out_notsk;
+
+        if (request == PTRACE_ATTACH) {
+                ret = ptrace_attach(child);
+                goto out;
+        }
+
+        ret = ptrace_check_attach(child, request == PTRACE_KILL);
+        if (ret < 0)
+                goto out;
+
+        switch (request) {
+        /* When I and D space are separate, these will need to be fixed.  */
+        case PTRACE_PEEKTEXT: /* read word at location addr. */
+        case PTRACE_PEEKDATA:
+                copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
+                ret = -EIO;
+                if (copied != sizeof(tmp))
+                        break;
+                
+                regs->r0 = 0;   /* special return: no errors */
+                ret = tmp;
+                break;
+
+        /* Read register number ADDR. */
+        case PTRACE_PEEKUSR:
+                regs->r0 = 0;   /* special return: no errors */
+                ret = get_reg(child, addr);
+                DBG(DBG_MEM, ("peek $%ld->%#lx\n", addr, ret));
+                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:
+                tmp = data;
+                copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 1);
+                ret = (copied == sizeof(tmp)) ? 0 : -EIO;
+                break;
+
+        case PTRACE_POKEUSR: /* write the specified register */
+                DBG(DBG_MEM, ("poke $%ld<-%#lx\n", addr, data));
+                ret = put_reg(child, addr, data);
+                break;
+
+        case PTRACE_SYSCALL:
+                /* continue and stop at next (return from) syscall */
+        case PTRACE_CONT:    /* restart after signal. */
+                ret = -EIO;
+                if ((unsigned long) data > _NSIG)
+                        break;
+                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;
+                /* make sure single-step breakpoint is gone. */
+                ptrace_cancel_bpt(child);
+                wake_up_process(child);
+                ret = 0;
+                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:
+                ret = 0;
+                if (child->exit_state == EXIT_ZOMBIE)
+                        break;
+                child->exit_code = SIGKILL;
+                /* make sure single-step breakpoint is gone. */
+                ptrace_cancel_bpt(child);
+                wake_up_process(child);
+                goto out;
+
+        case PTRACE_SINGLESTEP:  /* execute single instruction. */
+                ret = -EIO;
+                if ((unsigned long) data > _NSIG)
+                        break;
+                /* Mark single stepping.  */
+                child->thread_info->bpt_nsaved = -1;
+                clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
+                child->exit_code = data;
+                wake_up_process(child);
+                /* give it a chance to run. */
+                ret = 0;
+                goto out;
+
+        case PTRACE_DETACH:      /* detach a process that was attached. */
+                ret = ptrace_detach(child, data);
+                goto out;
+
+        default:
+                ret = ptrace_request(child, request, addr, data);
+                goto out;
+        }
+ out:
+        put_task_struct(child);
+ out_notsk:
+        unlock_kernel();
+        return ret;
+}
+
+asmlinkage void
+syscall_trace(void)
+{
+        if (!test_thread_flag(TIF_SYSCALL_TRACE))
+                return;
+        if (!(current->ptrace & PT_PTRACED))
+                return;
+        /* The 0x80 provides a way for the tracing parent to distinguish
+           between a syscall stop and SIGTRAP delivery */
+        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;
+        }
+}