selftests/powerpc: Add a routine for retrieving an AUXV entry (bd8bbd87) · Commits · e / devices / android_kernel_xiaomi_markw

tools/testing/selftests/powerpc/pmu/lib.c

+48 −0

Original line number	Original line	Diff line number	Diff line
	@@ -5,10 +5,15 @@

	#define _GNU_SOURCE /* For CPU_ZERO etc. */		#define _GNU_SOURCE /* For CPU_ZERO etc. */

			#include <elf.h>
	#include <errno.h>		#include <errno.h>
			#include <fcntl.h>
			#include <link.h>
	#include <sched.h>		#include <sched.h>
	#include <setjmp.h>		#include <setjmp.h>
	#include <stdlib.h>		#include <stdlib.h>
			#include <sys/stat.h>
			#include <sys/types.h>
	#include <sys/wait.h>		#include <sys/wait.h>

	#include "utils.h"		#include "utils.h"
	@@ -250,3 +255,46 @@ out_close:
	out:		out:
	return rc;		return rc;
	}		}

			static char auxv[4096];

			void *get_auxv_entry(int type)
			{
			ElfW(auxv_t) *p;
			void *result;
			ssize_t num;
			int fd;

			fd = open("/proc/self/auxv", O_RDONLY);
			if (fd == -1) {
			perror("open");
			return NULL;
			}

			result = NULL;

			num = read(fd, auxv, sizeof(auxv));
			if (num < 0) {
			perror("read");
			goto out;
			}

			if (num > sizeof(auxv)) {
			printf("Overflowed auxv buffer\n");
			goto out;
			}

			p = (ElfW(auxv_t) *)auxv;

			while (p->a_type != AT_NULL) {
			if (p->a_type == type) {
			result = (void *)p->a_un.a_val;
			break;
			}

			p++;
			}
			out:
			close(fd);
			return result;
			}

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -29,6 +29,7 @@ extern int notify_parent(union pipe write_pipe);
	extern int notify_parent_of_error(union pipe write_pipe);		extern int notify_parent_of_error(union pipe write_pipe);
	extern pid_t eat_cpu(int (test_function)(void));		extern pid_t eat_cpu(int (test_function)(void));
	extern bool require_paranoia_below(int level);		extern bool require_paranoia_below(int level);
			extern void *get_auxv_entry(int type);

	struct addr_range {		struct addr_range {
	uint64_t first, last;		uint64_t first, last;