diff options
Diffstat (limited to 'src/tests/filst/sc-bad-write.c')
| -rw-r--r-- | src/tests/filst/sc-bad-write.c | 80 |
1 files changed, 40 insertions, 40 deletions
diff --git a/src/tests/filst/sc-bad-write.c b/src/tests/filst/sc-bad-write.c index fbd6260..18e8f4d 100644 --- a/src/tests/filst/sc-bad-write.c +++ b/src/tests/filst/sc-bad-write.c @@ -15,7 +15,7 @@ #define PGMASK BITMASK(PGSHIFT, PGBITS) /* Page offset bits (0:12). */ static inline void *pg_round_up (const void *va) { - return (void *) (((uintptr_t) va + PGSIZE - 1) & ~PGMASK); + return (void *) (((uintptr_t) va + PGSIZE - 1) & ~PGMASK); } /** @@ -31,49 +31,49 @@ const char *FAIL = "FAIL\n"; void test_main(void) { - // Get the addres of the first unmapped page in the system. - unsigned page = (unsigned)pg_round_up(&_end_bss); + // Get the addres of the first unmapped page in the system. + unsigned page = (unsigned)pg_round_up(&_end_bss); - // Reserve space for 4 parameters. - unsigned base = page - sizeof(int) * 4; + // Reserve space for 4 parameters. + unsigned base = page - sizeof(int) * 4; - // Call write() with space for 4 parameters (should be fine). - asm volatile ( - "movl %%esp, %%edi;" - "movl %0, %%esp;" // Set stack pointer to right below page boundary. - "movl %1, (%%esp);" // Try to call SYS_WRITE - "movl %2, 4(%%esp);" // Write to STDOUT - "movl %3, 8(%%esp);" // Load buffer. - "movl $6, 12(%%esp);" // Write length of string - "int $0x30;" - "movl %%edi, %%esp;" // Restore esp. - : - : "r" (base), - "i" (SYS_WRITE), - "i" (STDOUT_FILENO), - "r" (WORKS) - : "%esp", "%eax", "%edi"); + // Call write() with space for 4 parameters (should be fine). + asm volatile ( + "movl %%esp, %%edi;" + "movl %0, %%esp;" // Set stack pointer to right below page boundary. + "movl %1, (%%esp);" // Try to call SYS_WRITE + "movl %2, 4(%%esp);" // Write to STDOUT + "movl %3, 8(%%esp);" // Load buffer. + "movl $6, 12(%%esp);" // Write length of string + "int $0x30;" + "movl %%edi, %%esp;" // Restore esp. + : + : "r" (base), + "i" (SYS_WRITE), + "i" (STDOUT_FILENO), + "r" (WORKS) + : "%esp", "%eax", "%edi"); - // Reserve space for 3 parameters (write requires 4). - base = page - sizeof(int) * 3; + // Reserve space for 3 parameters (write requires 4). + base = page - sizeof(int) * 3; - // Call write() with space for 3 parameters (the kernel should kill us for doing this). - asm volatile ( - "movl %%esp, %%edi;" - "movl %0, %%esp;" // Set stack pointer to right below page boundary. - "movl %1, (%%esp);" // Try to call SYS_WRITE - "movl %2, 4(%%esp);" // Write to STDOUT - "movl %3, 8(%%esp);" // Load buffer. - //"movl $5, 12(%%esp);" // Can not write the last parameter as we would get a pagefault. - "int $0x30;" - "movl %%edi, %%esp;" // Restore esp in case we do not crash (as we should). - : - : "r" (base), - "i" (SYS_WRITE), - "i" (STDOUT_FILENO), - "r" (FAIL) - : "%esp", "%eax", "%edi"); + // Call write() with space for 3 parameters (the kernel should kill us for doing this). + asm volatile ( + "movl %%esp, %%edi;" + "movl %0, %%esp;" // Set stack pointer to right below page boundary. + "movl %1, (%%esp);" // Try to call SYS_WRITE + "movl %2, 4(%%esp);" // Write to STDOUT + "movl %3, 8(%%esp);" // Load buffer. + //"movl $5, 12(%%esp);" // Can not write the last parameter as we would get a pagefault. + "int $0x30;" + "movl %%edi, %%esp;" // Restore esp in case we do not crash (as we should). + : + : "r" (base), + "i" (SYS_WRITE), + "i" (STDOUT_FILENO), + "r" (FAIL) + : "%esp", "%eax", "%edi"); - fail("should have died."); + fail("should have died."); } |