diff options
Diffstat (limited to 'arch/um/kernel/skas/mem_user.c')
| -rw-r--r-- | arch/um/kernel/skas/mem_user.c | 112 |
1 files changed, 89 insertions, 23 deletions
diff --git a/arch/um/kernel/skas/mem_user.c b/arch/um/kernel/skas/mem_user.c index b0980ff..c976320 100644 --- a/arch/um/kernel/skas/mem_user.c +++ b/arch/um/kernel/skas/mem_user.c @@ -25,12 +25,14 @@ #include "sysdep/stub.h" #include "skas.h" -extern unsigned long syscall_stub, __syscall_stub_start; +extern unsigned long syscall_stub, batch_syscall_stub, __syscall_stub_start; extern void wait_stub_done(int pid, int sig, char * fname); -static long run_syscall_stub(struct mm_id * mm_idp, int syscall, - unsigned long *args) +int single_count = 0; + +static long one_syscall_stub(struct mm_id * mm_idp, int syscall, + unsigned long *args) { int n, pid = mm_idp->u.pid; unsigned long regs[MAX_REG_NR]; @@ -49,18 +51,80 @@ static long run_syscall_stub(struct mm_id * mm_idp, int syscall, regs[REGS_SYSCALL_ARG6] = args[5]; n = ptrace_setregs(pid, regs); if(n < 0){ - printk("run_syscall_stub : PTRACE_SETREGS failed, " + printk("one_syscall_stub : PTRACE_SETREGS failed, " + "errno = %d\n", n); + return(n); + } + + wait_stub_done(pid, 0, "one_syscall_stub"); + + return(*((unsigned long *) mm_idp->stack)); +} + +int multi_count = 0; +int multi_op_count = 0; + +static long many_syscall_stub(struct mm_id * mm_idp, int syscall, + unsigned long *args, int done, void **addr_out) +{ + unsigned long regs[MAX_REG_NR], *stack; + int n, pid = mm_idp->u.pid; + + stack = *addr_out; + if(stack == NULL) + stack = (unsigned long *) current_stub_stack(); + *stack++ = syscall; + *stack++ = args[0]; + *stack++ = args[1]; + *stack++ = args[2]; + *stack++ = args[3]; + *stack++ = args[4]; + *stack++ = args[5]; + *stack = 0; + multi_op_count++; + + if(!done && ((((unsigned long) stack) & ~PAGE_MASK) < + PAGE_SIZE - 8 * sizeof(long))){ + *addr_out = stack; + return 0; + } + + multi_count++; + get_safe_registers(regs); + regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE + + ((unsigned long) &batch_syscall_stub - + (unsigned long) &__syscall_stub_start); + regs[REGS_SP_INDEX] = UML_CONFIG_STUB_DATA; + + n = ptrace_setregs(pid, regs); + if(n < 0){ + printk("many_syscall_stub : PTRACE_SETREGS failed, " "errno = %d\n", n); return(n); } - wait_stub_done(pid, 0, "run_syscall_stub"); + wait_stub_done(pid, 0, "many_syscall_stub"); + stack = (unsigned long *) mm_idp->stack; - return(*((unsigned long *) mm_idp->stack)); + *addr_out = stack; + return(*stack); } -int map(struct mm_id *mm_idp, unsigned long virt, unsigned long len, - int r, int w, int x, int phys_fd, unsigned long long offset) +static long run_syscall_stub(struct mm_id * mm_idp, int syscall, + unsigned long *args, void **addr, int done) +{ + long res; + + if((*addr == NULL) && done) + res = one_syscall_stub(mm_idp, syscall, args); + else res = many_syscall_stub(mm_idp, syscall, args, done, addr); + + return res; +} + +void *map(struct mm_id * mm_idp, unsigned long virt, unsigned long len, + int r, int w, int x, int phys_fd, unsigned long long offset, + int done, void *data) { int prot, n; @@ -70,6 +134,7 @@ int map(struct mm_id *mm_idp, unsigned long virt, unsigned long len, if(proc_mm){ struct proc_mm_op map; int fd = mm_idp->u.mm_fd; + map = ((struct proc_mm_op) { .op = MM_MMAP, .u = { .mmap = @@ -91,21 +156,24 @@ int map(struct mm_id *mm_idp, unsigned long virt, unsigned long len, MAP_SHARED | MAP_FIXED, phys_fd, MMAP_OFFSET(offset) }; - res = run_syscall_stub(mm_idp, STUB_MMAP_NR, args); + res = run_syscall_stub(mm_idp, STUB_MMAP_NR, args, + &data, done); if((void *) res == MAP_FAILED) printk("mmap stub failed, errno = %d\n", res); } - return 0; + return data; } -int unmap(struct mm_id *mm_idp, void *addr, unsigned long len) +void *unmap(struct mm_id * mm_idp, void *addr, unsigned long len, int done, + void *data) { int n; if(proc_mm){ struct proc_mm_op unmap; int fd = mm_idp->u.mm_fd; + unmap = ((struct proc_mm_op) { .op = MM_MUNMAP, .u = { .munmap = @@ -113,28 +181,25 @@ int unmap(struct mm_id *mm_idp, void *addr, unsigned long len) (unsigned long) addr, .len = len } } } ); n = os_write_file(fd, &unmap, sizeof(unmap)); - if(n != sizeof(unmap)) { - if(n < 0) - return(n); - else if(n > 0) - return(-EIO); - } + if(n != sizeof(unmap)) + printk("unmap - proc_mm write returned %d\n", n); } else { int res; unsigned long args[] = { (unsigned long) addr, len, 0, 0, 0, 0 }; - res = run_syscall_stub(mm_idp, __NR_munmap, args); + res = run_syscall_stub(mm_idp, __NR_munmap, args, + &data, done); if(res < 0) printk("munmap stub failed, errno = %d\n", res); } - return(0); + return data; } -int protect(struct mm_id *mm_idp, unsigned long addr, unsigned long len, - int r, int w, int x) +void *protect(struct mm_id * mm_idp, unsigned long addr, unsigned long len, + int r, int w, int x, int done, void *data) { struct proc_mm_op protect; int prot, n; @@ -160,12 +225,13 @@ int protect(struct mm_id *mm_idp, unsigned long addr, unsigned long len, int res; unsigned long args[] = { addr, len, prot, 0, 0, 0 }; - res = run_syscall_stub(mm_idp, __NR_mprotect, args); + res = run_syscall_stub(mm_idp, __NR_mprotect, args, + &data, done); if(res < 0) panic("mprotect stub failed, errno = %d\n", res); } - return(0); + return data; } void before_mem_skas(unsigned long unused) |