{ "READBIOS", SYS_READBIOS },
{ "STIME", SYS_STIME },
{ "VMCTL", SYS_VMCTL },
+ { "MEMSET", SYS_MEMSET },
{ NULL, 0 }
};
KILL # 06
UMAP # 14
VIRCOPY # 15
+ MEMSET
;
vm PROCCTL;
io NONE; # No I/O range allowed
#define MEM_PTR m2_p1 /* base */
#define MEM_COUNT m2_l1 /* count */
#define MEM_PATTERN m2_l2 /* pattern to write */
+#define MEM_PROCESS m2_i1 /* NONE (phys) or process id (vir) */
/* Field names for SYS_DEVIO, SYS_VDEVIO, SYS_SDEVIO. */
#define DIO_REQUEST m2_i3 /* device in or output */
grant_offset, vir_bytes my_address, size_t bytes, int my_seg);
int sys_vsafecopy(struct vscp_vec *copyvec, int elements);
-int sys_memset(unsigned long pattern, phys_bytes base, phys_bytes
- bytes);
+int sys_memset(endpoint_t who, unsigned long pattern,
+ phys_bytes base, phys_bytes bytes);
/* Grant-based map functions. */
int sys_safemap(endpoint_t grantor, cp_grant_id_t grant, vir_bytes
#define MAP_FIXED 0x0200 /* require mapping to happen at hint */
#define MAP_THIRDPARTY 0x0400 /* perform on behalf of any process */
+#define MAP_UNINITIALIZED 0x0800 /* do not clear memory */
/*
* Error indicator returned by mmap(2)
struct exception_frame * frame,
int is_nested)
{
- int in_physcopy = 0;
+ int in_physcopy = 0, in_memset = 0;
reg_t pagefaultcr2;
message m_pagefault;
in_physcopy = (frame->eip > (vir_bytes) phys_copy) &&
(frame->eip < (vir_bytes) phys_copy_fault);
+ in_memset = (frame->eip > (vir_bytes) phys_memset) &&
+ (frame->eip < (vir_bytes) memset_fault);
+
if((is_nested || iskernelp(pr)) &&
- catch_pagefaults && in_physcopy) {
+ catch_pagefaults && (in_physcopy || in_memset)) {
#if 0
printf("pf caught! addr 0x%lx\n", pagefaultcr2);
#endif
if (is_nested) {
- frame->eip = (reg_t) phys_copy_fault_in_kernel;
+ if(in_physcopy) {
+ assert(!in_memset);
+ frame->eip = (reg_t) phys_copy_fault_in_kernel;
+ } else {
+ frame->eip = (reg_t) memset_fault_in_kernel;
+ }
}
else {
pr->p_reg.pc = (reg_t) phys_copy_fault;
u32_t read_cr3(void);
void reload_cr3(void);
void i386_invlpg(phys_bytes linaddr);
-void phys_memset(phys_bytes ph, u32_t c, phys_bytes bytes);
+vir_bytes phys_memset(phys_bytes ph, u32_t c, phys_bytes bytes);
void reload_ds(void);
void ia32_msr_read(u32_t reg, u32_t * hi, u32_t * lo);
void ia32_msr_write(u32_t reg, u32_t hi, u32_t lo);
inc %ebp
dec %eax
jmp remain_fill
+
fill_done:
+LABEL(memset_fault) /* kernel can send us here */
+ mov $0, %eax /* 0 means: no fault */
pop %ds
pop %ebx
pop %esi
pop %ebp
ret
+LABEL(memset_fault_in_kernel) /* kernel can send us here */
+ pop %ds
+ pop %ebx
+ pop %esi
+ pop %ebp
+ mov %cr2, %eax
+ ret
+
/*===========================================================================*/
/* mem_rdw */
}
#endif
-/*===========================================================================*
- * lin_memset *
- *===========================================================================*/
-int vm_phys_memset(phys_bytes ph, const u8_t c, phys_bytes bytes)
+int vm_memset(endpoint_t who, phys_bytes ph, const u8_t c, phys_bytes bytes)
{
u32_t p;
-
+ int r = OK;
+ struct proc *whoptr = NULL;
+
+ /* NONE for physical, otherwise virtual */
+ if(who != NONE) {
+ int n;
+ vir_bytes lin;
+ assert(vm_running);
+ if(!isokendpt(who, &n)) return ESRCH;
+ whoptr = proc_addr(n);
+ if(!(lin = umap_local(whoptr, D, ph, bytes))) return EFAULT;
+ ph = lin;
+ }
+
p = c | (c << 8) | (c << 16) | (c << 24);
if(!vm_running) {
+ if(who != NONE) panic("can't vm_memset without vm running");
phys_memset(ph, p, bytes);
return OK;
}
assert(get_cpulocal_var(ptproc)->p_seg.p_cr3_v);
- /* With VM, we have to map in the physical memory.
+ assert(!catch_pagefaults);
+ catch_pagefaults=1;
+
+ /* With VM, we have to map in the memory (virtual or physical).
* We can do this 4MB at a time.
*/
while(bytes > 0) {
int changed = 0;
- phys_bytes chunk = bytes, ptr;
- ptr = createpde(NULL, ph, &chunk, 0, &changed);
+ phys_bytes chunk = bytes, ptr, pfa;
+ ptr = createpde(whoptr, ph, &chunk, 0, &changed);
if(changed)
reload_cr3();
/* We can memset as many bytes as we have remaining,
* or as many as remain in the 4MB chunk we mapped in.
*/
- phys_memset(ptr, p, chunk);
+ if((pfa=phys_memset(ptr, p, chunk))) {
+ printf("kernel memset pagefault\n");
+ r = EFAULT;
+ break;
+ }
bytes -= chunk;
ph += chunk;
}
+ assert(catch_pagefaults);
+ catch_pagefaults=0;
+
assert(get_cpulocal_var(ptproc)->p_seg.p_cr3_v);
return OK;
count);
void phys_copy_fault(void);
void phys_copy_fault_in_kernel(void);
+void memset_fault(void);
+void memset_fault_in_kernel(void);
#define virtual_copy(src, dst, bytes) \
virtual_copy_f(NULL, src, dst, bytes, 0)
#define virtual_copy_vmcheck(caller, src, dst, bytes) \
phys_bytes umap_virtual(struct proc* rp, int seg, vir_bytes vir_addr,
vir_bytes bytes);
phys_bytes seg2phys(u16_t);
-int vm_phys_memset(phys_bytes source, u8_t pattern, phys_bytes count);
+int vm_memset(endpoint_t who,
+ phys_bytes source, u8_t pattern, phys_bytes count);
int intr_init(int, int);
void halt_cpu(void);
void arch_init(void);
{
/* Handle sys_memset(). This writes a pattern into the specified memory. */
unsigned char c = m_ptr->MEM_PATTERN;
- vm_phys_memset((phys_bytes) m_ptr->MEM_PTR, c, (phys_bytes) m_ptr->MEM_COUNT);
+ vm_memset(m_ptr->MEM_PROCESS, (phys_bytes) m_ptr->MEM_PTR,
+ c, (phys_bytes) m_ptr->MEM_COUNT);
return(OK);
}
int libexec_load_elf(struct exec_info *execi)
{
- int r;
Elf_Ehdr *hdr = NULL;
Elf_Phdr *phdr = NULL;
int e, i = 0;
*/
i = elf_has_interpreter(execi->hdr, execi->hdr_len, NULL, 0);
if(i > 0) {
- printf("libexec: cannot load dynamically linked executable\n");
return ENOEXEC;
}
- /* Make VM forget about all existing memory in process. */
- vm_procctl(execi->proc_e, VMPPARAM_CLEAR);
-
execi->stack_size = roundup(execi->stack_size, PAGE_SIZE);
execi->stack_high = VM_STACKTOP;
assert(!(VM_STACKTOP % PAGE_SIZE));
stacklow = execi->stack_high - execi->stack_size;
+ assert(execi->copymem);
+ assert(execi->clearmem);
+ assert(execi->allocmem_prealloc);
+ assert(execi->allocmem_ondemand);
+
+ if(execi->clearproc) execi->clearproc(execi);
+
for (i = 0; i < hdr->e_phnum; i++) {
vir_bytes seg_membytes, page_offset, vaddr;
+ vir_bytes chunk, vfileend, vmemend;
Elf_Phdr *ph = &phdr[i];
if (ph->p_type != PT_LOAD || ph->p_memsz == 0) continue;
-#if 0
- printf("index %d memsz 0x%lx vaddr 0x%lx\n", i, ph->p_memsz, ph->p_vaddr);
-#endif
vaddr = ph->p_vaddr;
seg_membytes = ph->p_memsz;
page_offset = vaddr % PAGE_SIZE;
if(first || startv > vaddr) startv = vaddr;
first = 0;
-#if 0
- printf("libexec_load_elf: mmap 0x%lx bytes at 0x%lx\n",
- seg_membytes, vaddr);
-#endif
-
- /* Tell VM to make us some memory */
- if(minix_mmap_for(execi->proc_e, (void *) vaddr, seg_membytes,
- PROT_READ|PROT_WRITE|PROT_EXEC,
- MAP_ANON|MAP_PREALLOC|MAP_FIXED, -1, 0) == MAP_FAILED) {
- printf("libexec_load_elf: mmap of 0x%lx bytes failed\n", seg_membytes);
- vm_procctl(execi->proc_e, VMPPARAM_CLEAR);
+ /* make us some memory */
+ if(execi->allocmem_prealloc(execi, vaddr, seg_membytes) != OK) {
+ if(execi->clearproc) execi->clearproc(execi);
return ENOMEM;
}
+#if ELF_DEBUG
+ printf("mmapped 0x%lx-0x%lx\n", vaddr, vaddr+seg_membytes);
+#endif
+
/* Copy executable section into it */
- if(execi->load(execi, ph->p_offset, ph->p_vaddr, ph->p_filesz) != OK) {
- printf("libexec_load_elf: load callback failed\n");
- vm_procctl(execi->proc_e, VMPPARAM_CLEAR);
+ if(execi->copymem(execi, ph->p_offset, ph->p_vaddr, ph->p_filesz) != OK) {
+ if(execi->clearproc) execi->clearproc(execi);
return ENOMEM;
}
+
+#if ELF_DEBUG
+ printf("copied 0x%lx-0x%lx\n", ph->p_vaddr, ph->p_vaddr+ph->p_filesz);
+#endif
+
+ /* Clear remaining bits */
+ vfileend = ph->p_vaddr + ph->p_filesz;
+ vmemend = vaddr + seg_membytes;
+ if((chunk = ph->p_vaddr - vaddr) > 0) {
+#if ELF_DEBUG
+ printf("start clearing 0x%lx-0x%lx\n", vaddr, vaddr+chunk);
+#endif
+ execi->clearmem(execi, vaddr, chunk);
+ }
+ if((chunk = vmemend - vfileend) > 0) {
+#if ELF_DEBUG
+ printf("end clearing 0x%lx-0x%lx\n", vfileend, vaddr+chunk);
+#endif
+ execi->clearmem(execi, vfileend, chunk);
+ }
}
/* Make it a stack */
- if(minix_mmap_for(execi->proc_e, (void *) stacklow, execi->stack_size,
- PROT_READ|PROT_WRITE|PROT_EXEC,
- MAP_ANON|MAP_FIXED, -1, 0) == MAP_FAILED) {
- printf("libexec_load_elf: mmap for stack failed\n");
- vm_procctl(execi->proc_e, VMPPARAM_CLEAR);
+ if(execi->allocmem_ondemand(execi, stacklow, execi->stack_size) != OK) {
+ if(execi->clearproc) execi->clearproc(execi);
return ENOMEM;
}
execi->pc = hdr->e_entry;
execi->load_base = startv;
- if((r = libexec_pm_newexec(execi->proc_e, execi)) != OK) {
- printf("libexec_load_elf: pm_newexec failed: %d\n", r);
- }
-
- return(r);
+ return OK;
}
#include <minix/ipc.h>
#include <minix/com.h>
#include <minix/callnr.h>
+#include <minix/vm.h>
+#include <minix/syslib.h>
+#include <sys/mman.h>
#include <machine/elf.h>
+int libexec_alloc_mmap_prealloc(struct exec_info *execi, off_t vaddr, size_t len)
+{
+ if(minix_mmap_for(execi->proc_e, (void *) vaddr, len,
+ PROT_READ|PROT_WRITE|PROT_EXEC,
+ MAP_ANON|MAP_PREALLOC|MAP_UNINITIALIZED|MAP_FIXED, -1, 0) == MAP_FAILED) {
+ return ENOMEM;
+ }
+
+ return OK;
+}
+
+int libexec_alloc_mmap_ondemand(struct exec_info *execi, off_t vaddr, size_t len)
+{
+ if(minix_mmap_for(execi->proc_e, (void *) vaddr, len,
+ PROT_READ|PROT_WRITE|PROT_EXEC,
+ MAP_ANON|MAP_FIXED, -1, 0) == MAP_FAILED) {
+ return ENOMEM;
+ }
+
+ return OK;
+}
+
+int libexec_clearproc_vm_procctl(struct exec_info *execi)
+{
+ return vm_procctl(execi->proc_e, VMPPARAM_CLEAR);
+}
+
+int libexec_clear_sys_memset(struct exec_info *execi, off_t vaddr, size_t len)
+{
+ return sys_memset(execi->proc_e, 0, vaddr, len);
+}
+
void libexec_patch_ptr(char stack[ARG_MAX], vir_bytes base)
{
/* When doing an exec(name, argv, envp) call, the user builds up a stack
typedef int (*libexec_clearfunc_t)(struct exec_info *execi,
off_t vaddr, size_t len);
+typedef int (*libexec_allocfunc_t)(struct exec_info *execi,
+ off_t vaddr, size_t len);
+
+typedef int (*libexec_procclearfunc_t)(struct exec_info *execi);
+
struct exec_info {
/* Filled in by libexec caller */
endpoint_t proc_e; /* Process endpoint */
uid_t new_uid; /* Process UID after exec */
gid_t new_gid; /* Process GID after exec */
int allow_setuid; /* Allow set{u,g}id execution? */
- libexec_loadfunc_t load; /* Load callback */
- libexec_clearfunc_t clear; /* Clear callback */
- void *opaque; /* Callback data */
vir_bytes stack_size; /* Desired stack size */
+ /* Callback pointers for use by libexec */
+ libexec_loadfunc_t copymem; /* Copy callback */
+ libexec_clearfunc_t clearmem; /* Clear callback */
+ libexec_allocfunc_t allocmem_prealloc; /* Alloc callback */
+ libexec_allocfunc_t allocmem_ondemand; /* Alloc callback */
+ libexec_procclearfunc_t clearproc; /* Clear process callback */
+ void *opaque; /* Callback data */
+
/* Filled in by libexec load function */
vir_bytes load_base; /* Where executable is loaded */
vir_bytes pc; /* Entry point of exec file */
int libexec_pm_newexec(endpoint_t proc_e, struct exec_info *execi);
typedef int (*libexec_exec_loadfunc_t)(struct exec_info *execi);
-
int libexec_load_elf(struct exec_info *execi);
+int libexec_alloc_mmap_prealloc(struct exec_info *execi, off_t vaddr, size_t len);
+int libexec_alloc_mmap_ondemand(struct exec_info *execi, off_t vaddr, size_t len);
+int libexec_clearproc_vm_procctl(struct exec_info *execi);
+int libexec_clear_sys_memset(struct exec_info *execi, off_t vaddr, size_t len);
+
#endif /* !_LIBEXEC_H_ */
#include "syslib.h"
-int sys_memset(unsigned long pattern, phys_bytes base, phys_bytes bytes)
+int sys_memset(endpoint_t who, unsigned long pattern,
+ phys_bytes base, phys_bytes bytes)
{
/* Zero a block of data. */
message mess;
mess.MEM_PTR = (char *) base;
mess.MEM_COUNT = bytes;
mess.MEM_PATTERN = pattern;
+ mess.MEM_PROCESS = who;
return(_kernel_call(SYS_MEMSET, &mess));
}
strncpy(execi.progname, progname, PROC_NAME_LEN-1);
execi.progname[PROC_NAME_LEN-1] = '\0';
execi.frame_len = frame_len;
- execi.load = read_seg;
+
+ /* callback functions and data */
+ execi.copymem = read_seg;
+ execi.clearproc = libexec_clearproc_vm_procctl;
+ execi.clearmem = libexec_clear_sys_memset;
+ execi.allocmem_prealloc = libexec_alloc_mmap_prealloc;
+ execi.allocmem_ondemand = libexec_alloc_mmap_ondemand;
for(i = 0; exec_loaders[i].load_object != NULL; i++) {
r = (*exec_loaders[i].load_object)(&execi);
return r;
}
+ /* Inform PM */
+ if((r = libexec_pm_newexec(execi.proc_e, &execi)) != OK)
+ return r;
+
/* Patch up stack and copy it from RS to new core image. */
vsp = execi.stack_high;
vsp -= frame_len;
if (off+seg_bytes > execi->hdr_len) return ENOEXEC;
if((r= sys_vircopy(SELF, D, ((vir_bytes)execi->hdr)+off,
execi->proc_e, D, seg_addr, seg_bytes)) != OK) {
- printf("RS: exec read_seg: copy 0x%lx bytes into %d at 0x%lx failed: %d\n",
+ printf("RS: exec read_seg: copy 0x%x bytes into %d at 0x%lx failed: %d\n",
seg_bytes, execi->proc_e, seg_addr, r);
}
return r;
Get_read_vp(execi, fullpath, 0, 0, &resolve, fp);
}
+ /* callback functions and data */
+ execi.args.copymem = read_seg;
+ execi.args.clearproc = libexec_clearproc_vm_procctl;
+ execi.args.clearmem = libexec_clear_sys_memset;
+ execi.args.allocmem_prealloc = libexec_alloc_mmap_prealloc;
+ execi.args.allocmem_ondemand = libexec_alloc_mmap_ondemand;
execi.args.opaque = &execi;
- execi.args.load = &read_seg;
- execi.args.clear = NULL;
+
execi.args.proc_e = proc_e;
execi.args.frame_len = frame_len;
FAILCHECK(r);
+ /* Inform PM */
+ FAILCHECK(libexec_pm_newexec(proc_e, &execi.args));
+
/* Save off PC */
*pc = execi.args.pc;
if(memflags & PAF_CLEAR) {
int s;
- if ((s= sys_memset(0, CLICK_SIZE*mem,
+ if ((s= sys_memset(NONE, 0, CLICK_SIZE*mem,
VM_PAGE_SIZE*pages)) != OK)
panic("alloc_mem: sys_memset failed: %d", s);
}
assert(!addr_search(&addravl, pageno, AVL_EQUAL));
#if JUNKFREE
- if(sys_memset(0xa5a5a5a5, VM_PAGE_SIZE * pageno,
+ if(sys_memset(NONE, 0xa5a5a5a5, VM_PAGE_SIZE * pageno,
VM_PAGE_SIZE * npages) != OK)
panic("free_pages: sys_memset failed");
#endif
int mfflags = 0;
vir_bytes addr;
struct vir_region *vr = NULL;
+ int execpriv = 0;
+
+ /* RS and VFS can do slightly more special mmap() things */
+ if(m->m_source == VFS_PROC_NR || m->m_source == RS_PROC_NR)
+ execpriv = 1;
if(m->VMM_FLAGS & MAP_THIRDPARTY) {
- /* exec()ers, i.e. RS & VFS, can mmap() on behalf of anyone. */
- if(m->m_source != VFS_PROC_NR && m->m_source != RS_PROC_NR)
- return EPERM;
+ if(!execpriv) return EPERM;
if((r=vm_isokendpt(m->VMM_FORWHOM, &n)) != OK)
return ESRCH;
} else {
if(m->VMM_FLAGS & MAP_LOWER16M) vrflags |= VR_LOWER16MB;
if(m->VMM_FLAGS & MAP_LOWER1M) vrflags |= VR_LOWER1MB;
if(m->VMM_FLAGS & MAP_ALIGN64K) vrflags |= VR_PHYS64K;
+ if(m->VMM_FLAGS & MAP_UNINITIALIZED) {
+ if(!execpriv) return EPERM;
+ vrflags |= VR_UNINITIALIZED;
+ }
if(m->VMM_FLAGS & MAP_IPC_SHARED) {
vrflags |= VR_SHARED;
/* Shared memory has to be preallocated. */
}
}
+ /* Pre-allocations should be uninitialized, but after that it's a
+ * different story.
+ */
+ newregion->flags &= ~VR_UNINITIALIZED;
+
/* Link it. */
region_insert(&vmp->vm_regions_avl, newregion);
struct phys_region *physr, *nextphysr;
int changes = 0;
physr_iter iter;
+ u32_t allocflags = 0;
+
+ if(!(region->flags & VR_UNINITIALIZED)) {
+ allocflags = PAF_CLEAR;
+ }
#define FREE_RANGE_HERE(er1, er2) { \
struct phys_region *r1 = (er1), *r2 = (er2); \
if(start < end) { \
SANITYCHECK(SCL_DETAIL); \
if(map_new_physblock(vmp, region, start, \
- end-start, MAP_NONE, PAF_CLEAR, 0) != OK) { \
+ end-start, MAP_NONE, allocflags, 0) != OK) { \
SANITYCHECK(SCL_DETAIL); \
return ENOMEM; \
} \
#define VR_LOWER1MB 0x010
#define VR_CONTIG 0x020 /* Must be physically contiguous. */
#define VR_SHARED 0x040
+#define VR_UNINITIALIZED 0x080 /* Do not clear after allocation */
/* Mapping type: */
#define VR_ANON 0x100 /* Memory to be cleared and allocated */