1 // SPDX-License-Identifier: GPL-2.0+
126 	attr->type		= PERF_TYPE_BREAKPOINT;  in perf_user_event_attr_set()
127 	attr->size		= sizeof(struct perf_event_attr);  in perf_user_event_attr_set()
128 	attr->bp_type		= HW_BREAKPOINT_R;  in perf_user_event_attr_set()
129 	attr->bp_addr		= (u64)addr;  in perf_user_event_attr_set()
130 	attr->bp_len		= len;  in perf_user_event_attr_set()
131 	attr->exclude_kernel	= 1;  in perf_user_event_attr_set()
132 	attr->exclude_hv	= 1;  in perf_user_event_attr_set()
140 	return perf_event_open(&attr, child_pid, -1, -1, 0);  in perf_watchpoint_open()
146 	 * A perf counter is retrieved by the read() syscall. It contains  in perf_read_counter()
152 		return -1;  in perf_read_counter()
160 	info->version = 1;  in ppc_ptrace_init_breakpoint()
161 	info->trigger_type = type;  in ppc_ptrace_init_breakpoint()
162 	info->condition_mode = PPC_BREAKPOINT_CONDITION_NONE;  in ppc_ptrace_init_breakpoint()
163 	info->addr = (u64)addr;  in ppc_ptrace_init_breakpoint()
164 	info->addr2 = (u64)addr + len;  in ppc_ptrace_init_breakpoint()
165 	info->condition_value = 0;  in ppc_ptrace_init_breakpoint()
167 		info->addr_mode = PPC_BREAKPOINT_MODE_EXACT;  in ppc_ptrace_init_breakpoint()
169 		info->addr_mode = PPC_BREAKPOINT_MODE_RANGE_INCLUSIVE;  in ppc_ptrace_init_breakpoint()
186  * Wrapper around a plain fork() call that sets up the child for
187  * ptrace-ing. Both the parent and child return from this, though
204 		FAIL_IF_MSG(waitpid(*pid, &status, 0) == -1, "Failed to wait for child");  in ptrace_fork_child()
214  * We expect ptrace to take 'priority', as it is has before-execute
217  * The perf counter should not be incremented yet because perf has after-execute
222  * Both should increment the perf counter. We also test changing the PC somewhere
223  * different and stepping, which should not increment the perf counter.
229 	int perf_fd;	/* File descriptor of perf performance counter */  in same_watch_addr_test()
230 	u64 perf_count;	/* Most recently fetched perf performance counter value */  in same_watch_addr_test()
250 	/* Place a perf watchpoint counter on value */  in same_watch_addr_test()
252 	FAIL_IF_MSG(perf_fd < 0, "Failed to open perf performance counter");  in same_watch_addr_test()
262 	FAIL_IF_MSG(waitpid(pid, &status, 0) == -1, "Failed to wait for child");  in same_watch_addr_test()
271 	FAIL_IF_MSG(perf_read_counter(perf_fd, &perf_count), "Failed to read perf counter");  in same_watch_addr_test()
274 	/* Single stepping over the load should increment the perf counter */  in same_watch_addr_test()
277 	FAIL_IF_MSG(waitpid(pid, &status, 0) == -1, "Failed to wait for child");  in same_watch_addr_test()
281 	FAIL_IF_MSG(perf_read_counter(perf_fd, &perf_count), "Failed to read perf counter");  in same_watch_addr_test()
282 	FAIL_IF_MSG(perf_count != 1, "perf counter did not increment");  in same_watch_addr_test()
285 	 * Set up a ptrace watchpoint on the value again and trigger it.  in same_watch_addr_test()
286 	 * The perf counter should not have incremented because we do not  in same_watch_addr_test()
295 	FAIL_IF_MSG(waitpid(pid, &status, 0) == -1, "Failed to wait for child");  in same_watch_addr_test()
299 	FAIL_IF_MSG(perf_read_counter(perf_fd, &perf_count), "Failed to read perf counter");  in same_watch_addr_test()
300 	FAIL_IF_MSG(perf_count != 1, "perf counter should not have changed");  in same_watch_addr_test()
302 	/* Continuing over the load should increment the perf counter */  in same_watch_addr_test()
305 	FAIL_IF_MSG(waitpid(pid, &status, 0) == -1, "Failed to wait for child");  in same_watch_addr_test()
309 	FAIL_IF_MSG(perf_read_counter(perf_fd, &perf_count), "Failed to read perf counter");  in same_watch_addr_test()
310 	FAIL_IF_MSG(perf_count != 2, "perf counter did not increment");  in same_watch_addr_test()
314 	 * we should reach the end trap (because ptrace is one-shot) and have  in same_watch_addr_test()
320 	FAIL_IF_MSG(waitpid(pid, &status, 0) == -1, "Failed to wait for child");  in same_watch_addr_test()
324 	FAIL_IF_MSG(perf_read_counter(perf_fd, &perf_count), "Failed to read perf counter");  in same_watch_addr_test()
325 	FAIL_IF_MSG(perf_count != 3, "perf counter did not increment");  in same_watch_addr_test()
330 	 * the ptrace trap without incrementing the perf counter  in same_watch_addr_test()
338 	FAIL_IF_MSG(waitpid(pid, &status, 0) == -1, "Failed to wait for child");  in same_watch_addr_test()
342 	FAIL_IF_MSG(perf_read_counter(perf_fd, &perf_count), "Failed to read perf counter");  in same_watch_addr_test()
343 	FAIL_IF_MSG(perf_count != 3, "perf counter should not have changed");  in same_watch_addr_test()
347 	 * not increment the perf counter (because ptrace is before-execute,  in same_watch_addr_test()
348 	 * perf is after-execute).  in same_watch_addr_test()
353 	FAIL_IF_MSG(waitpid(pid, &status, 0) == -1, "Failed to wait for child");  in same_watch_addr_test()
357 	FAIL_IF_MSG(perf_read_counter(perf_fd, &perf_count), "Failed to read perf counter");  in same_watch_addr_test()
358 	FAIL_IF_MSG(perf_count != 3, "perf counter should not have changed");  in same_watch_addr_test()
360 	/* Clean up child */  in same_watch_addr_test()
376  * We expect the perf counter to increment before the ptrace watchpoint
383 	int perf_fd;	/* File descriptor of perf performance counter */  in perf_then_ptrace_test()
384 	u64 perf_count;	/* Most recently fetched perf performance counter value */  in perf_then_ptrace_test()
409 	/* Place a perf watchpoint counter */  in perf_then_ptrace_test()
411 	FAIL_IF_MSG(perf_fd < 0, "Failed to open perf performance counter");  in perf_then_ptrace_test()
422 	FAIL_IF_MSG(waitpid(pid, &status, 0) == -1, "Failed to wait for child");  in perf_then_ptrace_test()
428 	FAIL_IF_MSG(perf_read_counter(perf_fd, &perf_count), "Failed to read perf counter");  in perf_then_ptrace_test()
429 	FAIL_IF_MSG(perf_count != 1, "perf counter did not increment");  in perf_then_ptrace_test()
431 	/* Clean up child */  in perf_then_ptrace_test()