1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
#include <stdio.h>
#include <signal.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <libmcpu.h>
#define CHECK(c,m) do{if(!(c)){fprintf(stderr,"FAIL: %s\n",m);return 1;}}while(0)
static int
page_aligned( const void *p, size_t page )
{
return( p != 0 && ( (size_t)p % page ) == 0 );
}
int
main( void )
{
long ps;
size_t page;
pid_t pid;
int status;
__mpu_UNIT_t code[3] =
{
0x00, 0x00, 0x00
};
__cpu_init();
ps = sysconf( _SC_PAGESIZE );
CHECK( ps > 0, "host page size" );
page = (size_t)ps;
CHECK( CPU_ABI_MAX_ALIGN == 16U, "ABI maximum natural alignment" );
CHECK( CPU_ABI_STACK_ALIGN == 16U, "ABI stack alignment" );
CHECK( CPU_ABI_ARGUMENT_BLOCK_ALIGN == 16U, "ABI argument block alignment" );
CHECK( CPU_DATA_NULL_GUARD_SIZE == 16U, "DATA NULL guard size" );
CHECK( CPU_NULL_PTR == __mpu_UINT64_C( 0 ), "NULL PTR64 encoding" );
CHECK( __cpu_data_alloc( 1 ) == 0, "allocate one-byte DATA" );
CHECK( __cpu_data_size() == 1, "DATA architectural size is exact" );
CHECK( page_aligned( __cpu_data_ptr(), page ), "DATA host base is page aligned" );
CHECK( __cpu_data_ptr()[0] == 0, "anonymous DATA mapping is zero-filled" );
__cpu_data_ptr()[0] = 0x5a;
CHECK( __cpu_data_ptr()[0] == 0x5a, "DATA mapping is writable" );
CHECK( __cpu_stack_alloc( 1 ) == 0, "allocate one-byte STACK" );
CHECK( __cpu_stack_size() == 1, "STACK architectural size is exact" );
CHECK( page_aligned( __cpu_stack_ptr(), page ), "STACK host base is page aligned" );
CHECK( __cpu_stack_ptr()[0] == 0, "anonymous STACK mapping is zero-filled" );
CHECK( __cpu_sp == 1 && __cpu_fp == 1, "empty STACK uses exact architectural size" );
CHECK( __cpu_program_alloc( sizeof( code ) ) == 0, "allocate PROGRAM for loading" );
CHECK( __cpu_program_size() == sizeof( code ), "PROGRAM architectural size is exact" );
CHECK( page_aligned( __cpu_program_ptr(), page ), "PROGRAM host base is page aligned" );
memcpy( __cpu_program_ptr(), code, sizeof( code ) );
__cpu_program_ptr()[0] = 0x12;
/* PROGRAM is writable during image loading. */
CHECK( __cpu_program_ptr()[0] == 0x12, "PROGRAM writable before protect" );
CHECK( __cpu_program_protect() == 0, "protect PROGRAM read-only" );
/* Verify host protection without crashing the test process itself. */
pid = fork();
CHECK( pid >= 0, "fork for PROGRAM protection test" );
if( pid == 0 )
{
volatile __mpu_UNIT_t *p = __cpu_program_ptr();
p[0] = 0x34;
_exit( 0 );
}
CHECK( waitpid( pid, &status, 0 ) == pid, "wait for protection child" );
CHECK( WIFSIGNALED( status ), "PROGRAM host write is trapped" );
CHECK( WTERMSIG( status ) == SIGSEGV || WTERMSIG( status ) == SIGBUS,
"PROGRAM write fault signal");
/* Reallocation must unmap the protected image and create a fresh RW mapping. */
CHECK( __cpu_program_alloc( 2 ) == 0, "reallocate PROGRAM after protection" );
CHECK( __cpu_program_size() == 2, "reallocated PROGRAM exact size" );
__cpu_program_ptr()[0] = 0x56;
CHECK( __cpu_program_ptr()[0] == 0x56, "new PROGRAM mapping writable for loading" );
__cpu_free_context();
puts( "libcpu anonymous-mmap memory regression: PASS" );
return( 0 );
}
|
