/*
 * Ptrace test for TAR, PPR, DSCR registers
 *
 * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */
#include "ptrace.h"
#include "ptrace-tar.h"

/* Tracer and Tracee Shared Data */
int shm_id;
int *cptr;
int *pptr;

void tar(void)
{
	unsigned long reg[3];
	int ret;

	cptr = (int *)shmat(shm_id, NULL, 0);
	printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
			user_write, TAR_1, PPR_1, DSCR_1);

	mtspr(SPRN_TAR, TAR_1);
	mtspr(SPRN_PPR, PPR_1);
	mtspr(SPRN_DSCR, DSCR_1);

	cptr[2] = 1;

	/* Wait on parent */
	while (!cptr[0])
		asm volatile("" : : : "memory");

	reg[0] = mfspr(SPRN_TAR);
	reg[1] = mfspr(SPRN_PPR);
	reg[2] = mfspr(SPRN_DSCR);

	printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
			user_read, reg[0], reg[1], reg[2]);

	/* Unblock the parent now */
	cptr[1] = 1;
	shmdt((int *)cptr);

	ret = validate_tar_registers(reg, TAR_2, PPR_2, DSCR_2);
	if (ret)
		exit(1);
	exit(0);
}

int trace_tar(pid_t child)
{
	unsigned long reg[3];

	FAIL_IF(start_trace(child));
	FAIL_IF(show_tar_registers(child, reg));
	printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
			ptrace_read_running, reg[0], reg[1], reg[2]);

	FAIL_IF(validate_tar_registers(reg, TAR_1, PPR_1, DSCR_1));
	FAIL_IF(stop_trace(child));
	return TEST_PASS;
}

int trace_tar_write(pid_t child)
{
	FAIL_IF(start_trace(child));
	FAIL_IF(write_tar_registers(child, TAR_2, PPR_2, DSCR_2));
	printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
			ptrace_write_running, TAR_2, PPR_2, DSCR_2);

	FAIL_IF(stop_trace(child));
	return TEST_PASS;
}

int ptrace_tar(void)
{
	pid_t pid;
	int ret, status;

	shm_id = shmget(IPC_PRIVATE, sizeof(int) * 3, 0777|IPC_CREAT);
	pid = fork();
	if (pid < 0) {
		perror("fork() failed");
		return TEST_FAIL;
	}

	if (pid == 0)
		tar();

	if (pid) {
		pptr = (int *)shmat(shm_id, NULL, 0);
		pptr[0] = 0;
		pptr[1] = 0;

		while (!pptr[2])
			asm volatile("" : : : "memory");
		ret = trace_tar(pid);
		if (ret)
			return ret;

		ret = trace_tar_write(pid);
		if (ret)
			return ret;

		/* Unblock the child now */
		pptr[0] = 1;

		/* Wait on child */
		while (!pptr[1])
			asm volatile("" : : : "memory");

		shmdt((int *)pptr);

		ret = wait(&status);
		shmctl(shm_id, IPC_RMID, NULL);
		if (ret != pid) {
			printf("Child's exit status not captured\n");
			return TEST_PASS;
		}

		return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
			TEST_PASS;
	}
	return TEST_PASS;
}

int main(int argc, char *argv[])
{
	return test_harness(ptrace_tar, "ptrace_tar");
}
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=33e962c8871f015f5c8978384553dddcf5b81b22'>root</a>/<a href='/cgit.cgi/linux/net-next.git/diff/sound?h=nds-private-remove&amp;id=33e962c8871f015f5c8978384553dddcf5b81b22'>sound</a>/<a href='/cgit.cgi/linux/net-next.git/diff/sound/soc?h=nds-private-remove&amp;id=33e962c8871f015f5c8978384553dddcf5b81b22'>soc</a>/<a href='/cgit.cgi/linux/net-next.git/diff/sound/soc/codecs?h=nds-private-remove&amp;id=33e962c8871f015f5c8978384553dddcf5b81b22'>codecs</a>/<a href='/cgit.cgi/linux/net-next.git/diff/sound/soc/codecs/wm8900.c?h=nds-private-remove&amp;id=33e962c8871f015f5c8978384553dddcf5b81b22'>wm8900.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='33e962c8871f015f5c8978384553dddcf5b81b22'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=33e962c8871f015f5c8978384553dddcf5b81b22'>Diffstat</a> (limited to 'sound/soc/codecs/wm8900.c')</div><table summary='diffstat' class='diffstat'>