aboutsummaryrefslogtreecommitdiffstats
path: root/arch/alpha/kernel/ptrace.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/alpha/kernel/ptrace.c')
-rw-r--r--arch/alpha/kernel/ptrace.c71
1 files changed, 32 insertions, 39 deletions
diff --git a/arch/alpha/kernel/ptrace.c b/arch/alpha/kernel/ptrace.c
index bbd37536d14ef..0cd060598f9aa 100644
--- a/arch/alpha/kernel/ptrace.c
+++ b/arch/alpha/kernel/ptrace.c
@@ -72,6 +72,13 @@ enum {
REG_R0 = 0, REG_F0 = 32, REG_FPCR = 63, REG_PC = 64
};
+#define PT_REG(reg) \
+ (PAGE_SIZE*2 - sizeof(struct pt_regs) + offsetof(struct pt_regs, reg))
+
+#define SW_REG(reg) \
+ (PAGE_SIZE*2 - sizeof(struct pt_regs) - sizeof(struct switch_stack) \
+ + offsetof(struct switch_stack, reg))
+
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),
@@ -103,14 +110,14 @@ get_reg_addr(struct task_struct * task, unsigned long regno)
unsigned long *addr;
if (regno == 30) {
- addr = &task->thread_info->pcb.usp;
+ addr = &task_thread_info(task)->pcb.usp;
} else if (regno == 65) {
- addr = &task->thread_info->pcb.unique;
+ addr = &task_thread_info(task)->pcb.unique;
} else if (regno == 31 || regno > 65) {
zero = 0;
addr = &zero;
} else {
- addr = (void *)task->thread_info + regoff[regno];
+ addr = task_stack_page(task) + regoff[regno];
}
return addr;
}
@@ -125,7 +132,7 @@ get_reg(struct task_struct * task, unsigned long regno)
if (regno == 63) {
unsigned long fpcr = *get_reg_addr(task, regno);
unsigned long swcr
- = task->thread_info->ieee_state & IEEE_SW_MASK;
+ = task_thread_info(task)->ieee_state & IEEE_SW_MASK;
swcr = swcr_update_status(swcr, fpcr);
return fpcr | swcr;
}
@@ -139,8 +146,8 @@ 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)
+ task_thread_info(task)->ieee_state
+ = ((task_thread_info(task)->ieee_state & ~IEEE_SW_MASK)
| (data & IEEE_SW_MASK));
data = (data & FPCR_DYN_MASK) | ieee_swcr_to_fpcr(data);
}
@@ -188,35 +195,35 @@ ptrace_set_bpt(struct task_struct * child)
* branch (emulation can be tricky for fp branches).
*/
displ = ((s32)(insn << 11)) >> 9;
- child->thread_info->bpt_addr[nsaved++] = pc + 4;
+ task_thread_info(child)->bpt_addr[nsaved++] = pc + 4;
if (displ) /* guard against unoptimized code */
- child->thread_info->bpt_addr[nsaved++]
+ task_thread_info(child)->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);
+ task_thread_info(child)->bpt_addr[nsaved++] = get_reg(child, reg_b);
DBG(DBG_BPT, ("execing jump\n"));
} else {
- child->thread_info->bpt_addr[nsaved++] = pc + 4;
+ task_thread_info(child)->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],
+ res = read_int(child, task_thread_info(child)->bpt_addr[i],
(int *) &insn);
if (res < 0)
return res;
- child->thread_info->bpt_insn[i] = insn;
+ task_thread_info(child)->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],
+ task_thread_info(child)->bpt_addr[i]));
+ res = write_int(child, task_thread_info(child)->bpt_addr[i],
BREAKINST);
if (res < 0)
return res;
}
- child->thread_info->bpt_nsaved = nsaved;
+ task_thread_info(child)->bpt_nsaved = nsaved;
return 0;
}
@@ -227,9 +234,9 @@ ptrace_set_bpt(struct task_struct * child)
int
ptrace_cancel_bpt(struct task_struct * child)
{
- int i, nsaved = child->thread_info->bpt_nsaved;
+ int i, nsaved = task_thread_info(child)->bpt_nsaved;
- child->thread_info->bpt_nsaved = 0;
+ task_thread_info(child)->bpt_nsaved = 0;
if (nsaved > 2) {
printk("ptrace_cancel_bpt: bogus nsaved: %d!\n", nsaved);
@@ -237,8 +244,8 @@ ptrace_cancel_bpt(struct task_struct * child)
}
for (i = 0; i < nsaved; ++i) {
- write_int(child, child->thread_info->bpt_addr[i],
- child->thread_info->bpt_insn[i]);
+ write_int(child, task_thread_info(child)->bpt_addr[i],
+ task_thread_info(child)->bpt_insn[i]);
}
return (nsaved != 0);
}
@@ -265,30 +272,16 @@ do_sys_ptrace(long request, long pid, long addr, long data,
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;
+ ret = ptrace_traceme();
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)
+ child = ptrace_get_task_struct(pid);
+ if (IS_ERR(child)) {
+ ret = PTR_ERR(child);
goto out_notsk;
+ }
if (request == PTRACE_ATTACH) {
ret = ptrace_attach(child);
@@ -369,7 +362,7 @@ do_sys_ptrace(long request, long pid, long addr, long data,
if (!valid_signal(data))
break;
/* Mark single stepping. */
- child->thread_info->bpt_nsaved = -1;
+ task_thread_info(child)->bpt_nsaved = -1;
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
child->exit_code = data;
wake_up_process(child);
generated by cgit 1.2.3-korg (git 2.39.0) at 2024-05-18 22:15:44 +0000