From 6399b258873072cdb546dff84c37e735cda25ac7 Mon Sep 17 00:00:00 2001 From: Ben Pfaff Date: Thu, 18 Nov 2004 01:14:18 +0000 Subject: [PATCH] Some initial VM tests. --- grading/vm/arc4.c | 53 +++++++++++ grading/vm/arc4.h | 18 ++++ grading/vm/child-linear.c | 32 +++++++ grading/vm/child-sort.c | 50 ++++++++++ grading/vm/cksum.c | 86 +++++++++++++++++ grading/vm/cksum.h | 8 ++ grading/vm/page-linear.c | 39 ++++++++ grading/vm/page-linear.exp | 6 ++ grading/vm/page-merge-seq.c | 169 ++++++++++++++++++++++++++++++++++ grading/vm/page-parallel.c | 34 +++++++ grading/vm/page-parallel.exp | 9 ++ grading/vm/pt-bad-addr.c | 10 ++ grading/vm/pt-bad-addr.exp | 2 + grading/vm/pt-big-stk-obj.c | 19 ++++ grading/vm/pt-big-stk-obj.exp | 4 + grading/vm/pt-grow-stack.c | 19 ++++ grading/vm/pt-grow-stack.exp | 4 + grading/vm/pt-write-code.c | 10 ++ grading/vm/pt-write-code.exp | 2 + grading/vm/tests.txt | 29 ++++++ 20 files changed, 603 insertions(+) create mode 100644 grading/vm/arc4.c create mode 100644 grading/vm/arc4.h create mode 100644 grading/vm/child-linear.c create mode 100644 grading/vm/child-sort.c create mode 100644 grading/vm/cksum.c create mode 100644 grading/vm/cksum.h create mode 100644 grading/vm/page-linear.c create mode 100644 grading/vm/page-linear.exp create mode 100644 grading/vm/page-merge-seq.c create mode 100644 grading/vm/page-parallel.c create mode 100644 grading/vm/page-parallel.exp create mode 100644 grading/vm/pt-bad-addr.c create mode 100644 grading/vm/pt-bad-addr.exp create mode 100644 grading/vm/pt-big-stk-obj.c create mode 100644 grading/vm/pt-big-stk-obj.exp create mode 100644 grading/vm/pt-grow-stack.c create mode 100644 grading/vm/pt-grow-stack.exp create mode 100644 grading/vm/pt-write-code.c create mode 100644 grading/vm/pt-write-code.exp create mode 100644 grading/vm/tests.txt diff --git a/grading/vm/arc4.c b/grading/vm/arc4.c new file mode 100644 index 0000000..cd7fd6f --- /dev/null +++ b/grading/vm/arc4.c @@ -0,0 +1,53 @@ +#include +#include "arc4.h" + +/* Swap bytes. */ +static inline void +swap_byte (uint8_t *a, uint8_t *b) +{ + uint8_t t = *a; + *a = *b; + *b = t; +} + +void +arc4_init (struct arc4 *arc4, const void *key_, size_t size) +{ + const uint8_t *key = key_; + size_t key_idx; + uint8_t *s; + int i, j; + + s = arc4->s; + arc4->i = arc4->j = 0; + for (i = 0; i < 256; i++) + s[i] = i; + for (key_idx = 0, i = j = 0; i < 256; i++) + { + j = (j + s[i] + key[key_idx]) & 255; + swap_byte (s + i, s + j); + if (++key_idx >= size) + key_idx = 0; + } +} + +void +arc4_crypt (struct arc4 *arc4, void *buf_, size_t size) +{ + uint8_t *buf = buf_; + uint8_t *s; + uint8_t i, j; + + s = arc4->s; + i = arc4->i; + j = arc4->j; + while (size-- > 0) + { + i += 1; + j += s[i]; + swap_byte (s + i, s + j); + *buf++ ^= s[(s[i] + s[j]) & 255]; + } + arc4->i = i; + arc4->j = j; +} diff --git a/grading/vm/arc4.h b/grading/vm/arc4.h new file mode 100644 index 0000000..ccb260c --- /dev/null +++ b/grading/vm/arc4.h @@ -0,0 +1,18 @@ +#ifndef ARC4_H +#define ARC4_H + +#include +#include + +/* Alleged RC4 algorithm encryption state. */ +struct arc4 + { + uint8_t s[256]; + uint8_t i, j; + }; + +void arc4_init (struct arc4 *, const void *, size_t); +void arc4_crypt (struct arc4 *, void *, size_t); + + +#endif /* arc4.h */ diff --git a/grading/vm/child-linear.c b/grading/vm/child-linear.c new file mode 100644 index 0000000..1b22b49 --- /dev/null +++ b/grading/vm/child-linear.c @@ -0,0 +1,32 @@ +#include +#include "arc4.h" + +#define SIZE (128 * 1024) + +static char buf[SIZE]; + +int +main (int argc, char *argv[]) +{ + const char *key = argv[argc - 1]; + struct arc4 arc4; + size_t i; + + /* Encrypt zeros. */ + arc4_init (&arc4, key, strlen (key)); + arc4_crypt (&arc4, buf, SIZE); + + /* Decrypt back to zeros. */ + arc4_init (&arc4, key, strlen (key))); + arc4_crypt (&arc4, buf, SIZE); + + /* Check that it's all zeros. */ + for (i = 0; i < SIZE; i++) + if (buf[i] != '\0') + { + printf ("(child-linear) byte %zu != 0\n", i); + return 1; + } + + return 0x42; +} diff --git a/grading/vm/child-sort.c b/grading/vm/child-sort.c new file mode 100644 index 0000000..5ce8da4 --- /dev/null +++ b/grading/vm/child-sort.c @@ -0,0 +1,50 @@ +#include +#ifdef PINTOS +#include +#else +#include +#include +#endif + +unsigned char buf[65536]; +size_t histogram[256]; + +int +main (void) +{ + int fd; + unsigned char *p; + size_t size; + size_t i; + +#ifdef PINTOS + fd = open ("buffer"); +#else + fd = open ("buffer", O_RDWR); +#endif + if (fd < 0) + { + printf ("(child-sort) open() failed\n"); + return 1; + } + + size = read (fd, buf, sizeof buf); + for (i = 0; i < size; i++) + histogram[buf[i]]++; + p = buf; + for (i = 0; i < sizeof histogram / sizeof *histogram; i++) + { + size_t j = histogram[i]; + while (j-- > 0) + *p++ = i; + } +#ifdef PINTOS + seek (fd, 0); +#else + lseek (fd, 0, SEEK_SET); +#endif + write (fd, buf, size); + close (fd); + + return 0x123; +} diff --git a/grading/vm/cksum.c b/grading/vm/cksum.c new file mode 100644 index 0000000..1a4219c --- /dev/null +++ b/grading/vm/cksum.c @@ -0,0 +1,86 @@ +/* crctab[] and cksum() are from the `cksum' entry in SUSv3. */ + +#include "cksum.h" + +static unsigned long crctab[] = { + 0x00000000, + 0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b, + 0x1a864db2, 0x1e475005, 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, + 0x2b4bcb61, 0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd, + 0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9, 0x5f15adac, + 0x5bd4b01b, 0x569796c2, 0x52568b75, 0x6a1936c8, 0x6ed82b7f, + 0x639b0da6, 0x675a1011, 0x791d4014, 0x7ddc5da3, 0x709f7b7a, + 0x745e66cd, 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039, + 0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, 0xbe2b5b58, + 0xbaea46ef, 0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033, + 0xa4ad16ea, 0xa06c0b5d, 0xd4326d90, 0xd0f37027, 0xddb056fe, + 0xd9714b49, 0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95, + 0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1, 0xe13ef6f4, + 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, 0x34867077, 0x30476dc0, + 0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c, 0x2e003dc5, + 0x2ac12072, 0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16, + 0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca, 0x7897ab07, + 0x7c56b6b0, 0x71159069, 0x75d48dde, 0x6b93dddb, 0x6f52c06c, + 0x6211e6b5, 0x66d0fb02, 0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1, + 0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba, + 0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b, + 0xbb60adfc, 0xb6238b25, 0xb2e29692, 0x8aad2b2f, 0x8e6c3698, + 0x832f1041, 0x87ee0df6, 0x99a95df3, 0x9d684044, 0x902b669d, + 0x94ea7b2a, 0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e, + 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2, 0xc6bcf05f, + 0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34, + 0xdc3abded, 0xd8fba05a, 0x690ce0ee, 0x6dcdfd59, 0x608edb80, + 0x644fc637, 0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb, + 0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f, 0x5c007b8a, + 0x58c1663d, 0x558240e4, 0x51435d53, 0x251d3b9e, 0x21dc2629, + 0x2c9f00f0, 0x285e1d47, 0x36194d42, 0x32d850f5, 0x3f9b762c, + 0x3b5a6b9b, 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff, + 0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, 0xf12f560e, + 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65, + 0xeba91bbc, 0xef68060b, 0xd727bbb6, 0xd3e6a601, 0xdea580d8, + 0xda649d6f, 0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3, + 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7, 0xae3afba2, + 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, 0x9b3660c6, 0x9ff77d71, + 0x92b45ba8, 0x9675461f, 0x8832161a, 0x8cf30bad, 0x81b02d74, + 0x857130c3, 0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640, + 0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c, 0x7b827d21, + 0x7f436096, 0x7200464f, 0x76c15bf8, 0x68860bfd, 0x6c47164a, + 0x61043093, 0x65c52d24, 0x119b4be9, 0x155a565e, 0x18197087, + 0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec, + 0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d, + 0x2056cd3a, 0x2d15ebe3, 0x29d4f654, 0xc5a92679, 0xc1683bce, + 0xcc2b1d17, 0xc8ea00a0, 0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, + 0xdbee767c, 0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18, + 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4, 0x89b8fd09, + 0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662, + 0x933eb0bb, 0x97ffad0c, 0xafb010b1, 0xab710d06, 0xa6322bdf, + 0xa2f33668, 0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4 +}; + +/* This is the algorithm used by the Posix `cksum' utility. */ +unsigned long cksum(const unsigned char *b, size_t n) +{ + register unsigned i, c, s = 0; + for (i = n; i > 0; --i) { + c = (unsigned)(*b++); + s = (s << 8) ^ crctab[(s >> 24) ^ c]; + } + while (n != 0) { + c = n & 0377; + n >>= 8; + s = (s << 8) ^ crctab[(s >> 24) ^ c]; + } + return ~s; +} + +#ifdef STANDALONE_TEST +#include +int +main (void) +{ + char buf[65536]; + int n = fread (buf, 1, sizeof buf, stdin); + printf ("%lu\n", cksum (buf, n)); + return 0; +} +#endif diff --git a/grading/vm/cksum.h b/grading/vm/cksum.h new file mode 100644 index 0000000..79b7c42 --- /dev/null +++ b/grading/vm/cksum.h @@ -0,0 +1,8 @@ +#ifndef CKSUM_H +#define CKSUM_H + +#include + +unsigned long cksum(const unsigned char *b, size_t n); + +#endif /* cksum.h */ diff --git a/grading/vm/page-linear.c b/grading/vm/page-linear.c new file mode 100644 index 0000000..00ffb17 --- /dev/null +++ b/grading/vm/page-linear.c @@ -0,0 +1,39 @@ +#include +#include "arc4.h" + +#define SIZE (128 * 1024) + +static char buf[SIZE]; + +int +main (void) +{ + struct arc4 arc4; + size_t i; + + printf ("(page-linear) begin\n"); + + /* Encrypt zeros. */ + printf ("(page-linear) read/modify/write pass one\n"); + arc4_init (&arc4, "foobar", 6); + arc4_crypt (&arc4, buf, SIZE); + + /* Decrypt back to zeros. */ + printf ("(page-linear) read/modify/write pass two\n"); + arc4_init (&arc4, "foobar", 6); + arc4_crypt (&arc4, buf, SIZE); + + /* Check that it's all zeros. */ + printf ("(page-linear) read pass\n"); + for (i = 0; i < SIZE; i++) + if (buf[i] != '\0') + { + printf ("(page-linear) byte %zu != 0\n", i); + return 1; + } + + /* Done. */ + printf ("(page-linear) end\n"); + + return 0; +} diff --git a/grading/vm/page-linear.exp b/grading/vm/page-linear.exp new file mode 100644 index 0000000..291183b --- /dev/null +++ b/grading/vm/page-linear.exp @@ -0,0 +1,6 @@ +(page-linear) begin +(page-linear) read/modify/write pass one +(page-linear) read/modify/write pass two +(page-linear) read pass +(page-linear) end +page-linear: exit(0) diff --git a/grading/vm/page-merge-seq.c b/grading/vm/page-merge-seq.c new file mode 100644 index 0000000..3abe9e2 --- /dev/null +++ b/grading/vm/page-merge-seq.c @@ -0,0 +1,169 @@ +#include +#include +#ifdef PINTOS +#include +#else +#include +#include +#endif +#include "arc4.h" + +#define CHUNK_SIZE (63 * 1024) /* Max file size. */ +#define CHUNK_CNT 16 /* Number of chunks. */ +#define DATA_SIZE (CHUNK_CNT * CHUNK_SIZE) /* Buffer size. */ + +unsigned char buf1[DATA_SIZE], buf2[DATA_SIZE]; +size_t histogram[256]; + +/* Initialize buf1 with random data, + then count the number of instances of each value within it. */ +static void +init (void) +{ + struct arc4 arc4; + size_t i; + + printf ("page-merge-seq) init\n"); + + arc4_init (&arc4, "foobar", 6); + arc4_crypt (&arc4, buf1, sizeof buf1); + for (i = 0; i < sizeof buf1; i++) + histogram[buf1[i]]++; +} + +/* Sort each chunk of buf1 using a subprocess. */ +static void +sort (void) +{ + size_t i; + +#ifdef PINTOS + create ("buffer", CHUNK_SIZE); +#endif + for (i = 0; i < CHUNK_CNT; i++) + { + int fd; + + printf ("(page-merge-seq) sort chunk %zu\n", i); + + /* Write this chunk to a file. */ +#ifdef PINTOS + fd = open ("buffer"); +#else + fd = open ("buffer", O_WRONLY | O_CREAT, 0660); +#endif + if (fd < 0) + { + printf ("(page-merge-seq) open() failed\n"); + exit (1); + } + write (fd, buf1 + CHUNK_SIZE * i, CHUNK_SIZE); + close (fd); + + /* Sort with subprocess. */ +#ifdef PINTOS + pid_t child = exec ("child-sort"); + if (child == -1) + { + printf ("(page-merge-seq) exec() failed\n"); + exit (1); + } + if (join (child) != 0x123) + { + printf ("(page-merge-seq) join(exec()) returned bad value\n"); + exit (1); + } +#else + system ("./child-sort"); +#endif + + /* Read chunk back from file. */ +#ifdef PINTOS + fd = open ("buffer"); +#else + fd = open ("buffer", O_RDONLY); +#endif + if (fd < 0) + { + printf ("(page-merge-seq) open() failed\n"); + exit (1); + } + read (fd, buf1 + CHUNK_SIZE * i, CHUNK_SIZE); + close (fd); + } +} + +/* Merge the sorted chunks in buf1 into a fully sorted buf2. */ +static void +merge (void) +{ + unsigned char *mp[CHUNK_CNT]; + size_t mp_left; + unsigned char *op; + size_t i; + + printf ("(page-merge-seq) merge\n"); + + /* Initialize merge pointers. */ + mp_left = CHUNK_CNT; + for (i = 0; i < CHUNK_CNT; i++) + mp[i] = buf1 + CHUNK_SIZE * i; + + /* Merge. */ + op = buf2; + while (mp_left > 0) + { + /* Find smallest value. */ + size_t min = 0; + for (i = 1; i < mp_left; i++) + if (*mp[i] < *mp[min]) + min = i; + + /* Append value to buf2. */ + *op++ = *mp[min]; + + /* Advance merge pointer. + Delete this chunk from the set if it's emptied. */ + if ((++mp[min] - buf1) % CHUNK_SIZE == 0) + mp[min] = mp[--mp_left]; + } +} + +static void +verify (void) +{ + size_t buf_idx; + size_t hist_idx; + + printf ("(page-merge-seq) verify\n"); + + buf_idx = 0; + for (hist_idx = 0; hist_idx < sizeof histogram / sizeof *histogram; + hist_idx++) + { + while (histogram[hist_idx]-- > 0) + { + if (buf2[buf_idx] != hist_idx) + { + printf ("(page-merge-seq) bad value %d in byte %zu\n", + buf2[buf_idx], buf_idx); + exit (1); + } + buf_idx++; + } + } + + printf ("(page-merge-seq) success, buf_idx=%zu\n", buf_idx); +} + +int +main (void) +{ + printf ("(page-merge-seq) begin\n"); + init (); + sort (); + merge (); + verify (); + printf ("(page-merge-seq) end\n"); + return 0; +} diff --git a/grading/vm/page-parallel.c b/grading/vm/page-parallel.c new file mode 100644 index 0000000..c2d8eb3 --- /dev/null +++ b/grading/vm/page-parallel.c @@ -0,0 +1,34 @@ +#include + +#define CHILD_CNT 3 + +int +main (void) +{ + pid_t children[CHILD_CNT]; + int i; + + printf ("(page-parallel) begin\n"); + for (i = 0; i < CHILD_CNT; i++) + { + printf ("(page-parallel) start child %d\n", i); + children[i] = exec ("child-linear"); + if (children[i] == -1) + { + printf ("(page-parallel) exec() returned pid -1\n", children[i]); + return 1; + } + } + + for (i = 0; i < CHILD_CNT; i++) + { + int code; + printf ("(page-parallel) join child %d\n", i); + code = join (children[i]); + if (code != 0x42) + printf ("(page-parallel) child %d returned bad exit code\n", i); + } + printf ("(page-parallel) end\n"); + + return 0; +} diff --git a/grading/vm/page-parallel.exp b/grading/vm/page-parallel.exp new file mode 100644 index 0000000..bc914e6 --- /dev/null +++ b/grading/vm/page-parallel.exp @@ -0,0 +1,9 @@ +(page-parallel) begin +(page-parallel) start child 0 +(page-parallel) start child 1 +(page-parallel) start child 2 +(page-parallel) join child 0 +(page-parallel) join child 1 +(page-parallel) join child 2 +(page-parallel) end +page-parallel: exit(0) diff --git a/grading/vm/pt-bad-addr.c b/grading/vm/pt-bad-addr.c new file mode 100644 index 0000000..6d66587 --- /dev/null +++ b/grading/vm/pt-bad-addr.c @@ -0,0 +1,10 @@ +#include + +int +main (void) +{ + printf ("(pt-bad-addr) begin\n"); + printf ("(pt-bad-addr) addr=%d\n", *(int *) 0x04000000); + printf ("(pt-bad-addr) end\n"); + return 0; +} diff --git a/grading/vm/pt-bad-addr.exp b/grading/vm/pt-bad-addr.exp new file mode 100644 index 0000000..ac1492d --- /dev/null +++ b/grading/vm/pt-bad-addr.exp @@ -0,0 +1,2 @@ +(pt-bad-addr) begin +pt-bad-addr: exit(-1) diff --git a/grading/vm/pt-big-stk-obj.c b/grading/vm/pt-big-stk-obj.c new file mode 100644 index 0000000..70f5d79 --- /dev/null +++ b/grading/vm/pt-big-stk-obj.c @@ -0,0 +1,19 @@ +#include +#include +#include "arc4.h" +#include "cksum.h" + +int +main (void) +{ + char stk_obj[65536]; + struct arc4 arc4; + + printf ("(pt-big-stk-obj) begin\n"); + arc4_init (&arc4, "foobar", 6); + memset (stk_obj, 0, sizeof stk_obj); + arc4_crypt (&arc4, stk_obj, sizeof stk_obj); + printf ("(pt-big-stk-obj) cksum: %lu\n", cksum (stk_obj, sizeof stk_obj)); + printf ("(pt-big-stk-obj) end\n"); + return 0; +} diff --git a/grading/vm/pt-big-stk-obj.exp b/grading/vm/pt-big-stk-obj.exp new file mode 100644 index 0000000..0919025 --- /dev/null +++ b/grading/vm/pt-big-stk-obj.exp @@ -0,0 +1,4 @@ +(pt-big-stk-obj) begin +(pt-big-stk-obj) cksum: 3256410166 +(pt-big-stk-obj) end +pt-big-stk-obj: exit(0) diff --git a/grading/vm/pt-grow-stack.c b/grading/vm/pt-grow-stack.c new file mode 100644 index 0000000..805db98 --- /dev/null +++ b/grading/vm/pt-grow-stack.c @@ -0,0 +1,19 @@ +#include +#include +#include "arc4.h" +#include "cksum.h" + +int +main (void) +{ + char stack_obj[4096]; + struct arc4 arc4; + + printf ("(pt-grow-stack) begin\n"); + arc4_init (&arc4, "foobar", 6); + memset (stack_obj, 0, sizeof stack_obj); + arc4_crypt (&arc4, stack_obj, sizeof stack_obj); + printf ("(pt-grow-stack) cksum: %lu\n", cksum (stack_obj, sizeof stack_obj)); + printf ("(pt-grow-stack) end\n"); + return 0; +} diff --git a/grading/vm/pt-grow-stack.exp b/grading/vm/pt-grow-stack.exp new file mode 100644 index 0000000..2caafcf --- /dev/null +++ b/grading/vm/pt-grow-stack.exp @@ -0,0 +1,4 @@ +(pt-grow-stack) begin +(pt-grow-stack) cksum: 3424492700 +(pt-grow-stack) end +pt-grow-stack: exit(0) diff --git a/grading/vm/pt-write-code.c b/grading/vm/pt-write-code.c new file mode 100644 index 0000000..6954ddf --- /dev/null +++ b/grading/vm/pt-write-code.c @@ -0,0 +1,10 @@ +#include + +int +main (void) +{ + printf ("(pt-write-code) begin\n"); + *(int *) main = 0; + printf ("(pt-write-code) end\n"); + return 0; +} diff --git a/grading/vm/pt-write-code.exp b/grading/vm/pt-write-code.exp new file mode 100644 index 0000000..5844146 --- /dev/null +++ b/grading/vm/pt-write-code.exp @@ -0,0 +1,2 @@ +(pt-write-code) begin +pt-write-code: exit(-1) diff --git a/grading/vm/tests.txt b/grading/vm/tests.txt new file mode 100644 index 0000000..8839084 --- /dev/null +++ b/grading/vm/tests.txt @@ -0,0 +1,29 @@ +CORRECTNESS [[total]] +--------------------- + +Page table management + -4 pt-grow-stack: stack should be able to grow beyond one page + -1 pt-big-stk-obj: stack should be able to handle large objects + -3 pt-bad-addr: accesses to invalid virtual memory should fault + -1 pt-write-code: should not be able to write to the code segment +Score: /9 + +Paging + -4 page-linear: sequentially read/modify/write memory twice then read it back + -2 page-parallel: write then read lots of memory--3 processes at once + -2 page-merge-seq: sequential merge sort of large data set + -1 page-merge-par: parallel merge sort of large data set + -3 page-shuffle: shuffle content of large static buffer +Score: /12 + +Memory mapping + -4 mmap-read: use mmap to read a file, munmap + -1 mmap-close: use mmap, close file, read from mapping, munmap + -1 mmap-unmap: after munmap virtual memory area should be invalid + -1 mmap-overlap: try to mmap files in overlapping virtual memory areas + -2 mmap-twice: mmap'ing same file twice should work + -4 mmap-write: after mmap-modify-munmap a read should reflect changes + -4 mmap-exit: after mmap-modify-exit a read should reflect changes + -2 mmap-shuffle: shuffle content of mapped file +Score: /19 + -- 2.30.2