arch/microblaze/kernel/ptrace.c

Source file repositories/reference/linux-study-clean/arch/microblaze/kernel/ptrace.c

File Facts

System
Linux kernel
Corpus path
arch/microblaze/kernel/ptrace.c
Extension
.c
Size
4721 bytes
Lines
170
Domain
Architecture Layer
Bucket
arch/microblaze
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

if (addr >= PT_SIZE && request == PTRACE_PEEKUSR) {
			/*
			 * Special requests that don't actually correspond
			 * to offsets in struct pt_regs.
			 */
			if (addr == PT_TEXT_ADDR) {
				val = child->mm->start_code;
			} else if (addr == PT_DATA_ADDR) {
				val = child->mm->start_data;
			} else if (addr == PT_TEXT_LEN) {
				val = child->mm->end_code
					- child->mm->start_code;
			} else {
				rval = -EIO;
			}
		} else if (addr < PT_SIZE && (addr & 0x3) == 0) {
			microblaze_reg_t *reg_addr = reg_save_addr(addr, child);
			if (request == PTRACE_PEEKUSR)
				val = *reg_addr;
			else {
#if 1
				*reg_addr = data;
#else
				/* MS potential problem on WB system
				 * Be aware that reg_addr is virtual address
				 * virt_to_phys conversion is necessary.
				 * This could be sensible solution.
				 */
				u32 paddr = virt_to_phys((u32)reg_addr);
				invalidate_icache_range(paddr, paddr + 4);
				*reg_addr = data;
				flush_dcache_range(paddr, paddr + 4);
#endif
			}
		} else
			rval = -EIO;

		if (rval == 0 && request == PTRACE_PEEKUSR)
			rval = put_user(val, (unsigned long __user *)data);
		break;
	default:
		rval = ptrace_request(child, request, addr, data);
	}
	return rval;
}

asmlinkage unsigned long do_syscall_trace_enter(struct pt_regs *regs)
{
	unsigned long ret = 0;

	secure_computing_strict(regs->r12);

	if (test_thread_flag(TIF_SYSCALL_TRACE) &&
	    ptrace_report_syscall_entry(regs))
		/*
		 * Tracing decided this syscall should not happen.
		 * We'll return a bogus call number to get an ENOSYS
		 * error, but leave the original number in regs->regs[0].
		 */
		ret = -1L;

	audit_syscall_entry(regs->r12, regs->r5, regs->r6, regs->r7, regs->r8);

	return ret ?: regs->r12;
}

asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
{
	int step;

	audit_syscall_exit(regs);

	step = test_thread_flag(TIF_SINGLESTEP);
	if (step || test_thread_flag(TIF_SYSCALL_TRACE))
		ptrace_report_syscall_exit(regs, step);
}

void ptrace_disable(struct task_struct *child)
{
	/* nothing to do */
}

Annotation

Implementation Notes