From: Gennady Sharapov Date: Thu, 19 Jan 2006 01:42:45 +0000 (-0800) Subject: [PATCH] uml: move libc-dependent skas memory mapping code X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=f45d9fc9d80678c2ee22c578e503055207c46fd0;p=openwrt%2Fstaging%2Fblogic.git [PATCH] uml: move libc-dependent skas memory mapping code The serial UML OS-abstraction layer patch (um/kernel/skas dir). This moves all systemcalls from skas/mem_user.c file under os-Linux dir and join skas/mem_user.c and skas/mem.c files. Signed-off-by: Gennady Sharapov Signed-off-by: Jeff Dike Cc: Paolo 'Blaisorblade' Giarrusso Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/arch/um/include/os.h b/arch/um/include/os.h index 624938ad9e14..8006e085b675 100644 --- a/arch/um/include/os.h +++ b/arch/um/include/os.h @@ -11,6 +11,7 @@ #include "../os/include/file.h" #include "sysdep/ptrace.h" #include "kern_util.h" +#include "skas/mm_id.h" #define OS_TYPE_FILE 1 #define OS_TYPE_DIR 2 @@ -255,4 +256,20 @@ extern void user_time_init(void); extern void uml_idle_timer(void); extern unsigned long long os_nsecs(void); +/* skas/mem.c */ +extern long run_syscall_stub(struct mm_id * mm_idp, + int syscall, unsigned long *args, long expected, + void **addr, int done); +extern long syscall_stub_data(struct mm_id * mm_idp, + unsigned long *data, int data_count, + void **addr, void **stub_addr); +extern 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, int done, void **data); +extern int unmap(struct mm_id * mm_idp, void *addr, unsigned long len, + int done, void **data); +extern int protect(struct mm_id * mm_idp, unsigned long addr, + unsigned long len, int r, int w, int x, int done, + void **data); + #endif diff --git a/arch/um/include/skas/skas.h b/arch/um/include/skas/skas.h index 158f322248e3..7418f2addda2 100644 --- a/arch/um/include/skas/skas.h +++ b/arch/um/include/skas/skas.h @@ -24,14 +24,6 @@ extern void userspace(union uml_pt_regs *regs); extern void new_thread_proc(void *stack, void (*handler)(int sig)); extern void new_thread_handler(int sig); extern void handle_syscall(union uml_pt_regs *regs); -extern 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, int done, void **data); -extern int unmap(struct mm_id * mm_idp, void *addr, unsigned long len, - int done, void **data); -extern int protect(struct mm_id * mm_idp, unsigned long addr, - unsigned long len, int r, int w, int x, int done, - void **data); extern void user_signal(int sig, union uml_pt_regs *regs, int pid); extern int new_mm(unsigned long stack); extern int start_userspace(unsigned long stub_stack); @@ -39,11 +31,5 @@ extern int copy_context_skas0(unsigned long stack, int pid); extern void get_skas_faultinfo(int pid, struct faultinfo * fi); extern long execute_syscall_skas(void *r); extern unsigned long current_stub_stack(void); -extern long run_syscall_stub(struct mm_id * mm_idp, - int syscall, unsigned long *args, long expected, - void **addr, int done); -extern long syscall_stub_data(struct mm_id * mm_idp, - unsigned long *data, int data_count, - void **addr, void **stub_addr); #endif diff --git a/arch/um/kernel/skas/Makefile b/arch/um/kernel/skas/Makefile index 7a9fc16d71d4..eb664c67c3f4 100644 --- a/arch/um/kernel/skas/Makefile +++ b/arch/um/kernel/skas/Makefile @@ -1,9 +1,9 @@ -# +# # Copyright (C) 2002 - 2004 Jeff Dike (jdike@addtoit.com) # Licensed under the GPL # -obj-y := clone.o exec_kern.o mem.o mem_user.o mmu.o process.o process_kern.o \ +obj-y := clone.o exec_kern.o mem.o mmu.o process.o process_kern.o \ syscall.o tlb.o uaccess.o USER_OBJS := process.o clone.o diff --git a/arch/um/kernel/skas/mem_user.c b/arch/um/kernel/skas/mem_user.c deleted file mode 100644 index 1d89640bd502..000000000000 --- a/arch/um/kernel/skas/mem_user.c +++ /dev/null @@ -1,281 +0,0 @@ -/* - * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) - * Licensed under the GPL - */ - -#include -#include -#include -#include -#include -#include -#include -#include "mem_user.h" -#include "mem.h" -#include "skas.h" -#include "user.h" -#include "os.h" -#include "proc_mm.h" -#include "ptrace_user.h" -#include "user_util.h" -#include "kern_util.h" -#include "task.h" -#include "registers.h" -#include "uml-config.h" -#include "sysdep/ptrace.h" -#include "sysdep/stub.h" - -extern unsigned long batch_syscall_stub, __syscall_stub_start; - -extern void wait_stub_done(int pid, int sig, char * fname); - -static inline unsigned long *check_init_stack(struct mm_id * mm_idp, - unsigned long *stack) -{ - if(stack == NULL){ - stack = (unsigned long *) mm_idp->stack + 2; - *stack = 0; - } - return stack; -} - -extern int proc_mm; - -int single_count = 0; -int multi_count = 0; -int multi_op_count = 0; - -static long do_syscall_stub(struct mm_id *mm_idp, void **addr) -{ - unsigned long regs[MAX_REG_NR]; - unsigned long *data; - unsigned long *syscall; - long ret, offset; - int n, pid = mm_idp->u.pid; - - if(proc_mm) -#warning Need to look up userspace_pid by cpu - pid = userspace_pid[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); - n = ptrace_setregs(pid, regs); - if(n < 0) - panic("do_syscall_stub : PTRACE_SETREGS failed, errno = %d\n", - n); - - wait_stub_done(pid, 0, "do_syscall_stub"); - - /* When the stub stops, we find the following values on the - * beginning of the stack: - * (long )return_value - * (long )offset to failed sycall-data (0, if no error) - */ - ret = *((unsigned long *) mm_idp->stack); - offset = *((unsigned long *) mm_idp->stack + 1); - if (offset) { - data = (unsigned long *)(mm_idp->stack + - offset - UML_CONFIG_STUB_DATA); - syscall = (unsigned long *)((unsigned long)data + data[0]); - printk("do_syscall_stub: syscall %ld failed, return value = " - "0x%lx, expected return value = 0x%lx\n", - syscall[0], ret, syscall[7]); - printk(" syscall parameters: " - "0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n", - syscall[1], syscall[2], syscall[3], - syscall[4], syscall[5], syscall[6]); - for(n = 1; n < data[0]/sizeof(long); n++) { - if(n == 1) - printk(" additional syscall data:"); - if(n % 4 == 1) - printk("\n "); - printk(" 0x%lx", data[n]); - } - if(n > 1) - printk("\n"); - } - else ret = 0; - - *addr = check_init_stack(mm_idp, NULL); - - return ret; -} - -long run_syscall_stub(struct mm_id * mm_idp, int syscall, - unsigned long *args, long expected, void **addr, - int done) -{ - unsigned long *stack = check_init_stack(mm_idp, *addr); - - if(done && *addr == NULL) - single_count++; - - *stack += sizeof(long); - stack += *stack / sizeof(long); - - *stack++ = syscall; - *stack++ = args[0]; - *stack++ = args[1]; - *stack++ = args[2]; - *stack++ = args[3]; - *stack++ = args[4]; - *stack++ = args[5]; - *stack++ = expected; - *stack = 0; - multi_op_count++; - - if(!done && ((((unsigned long) stack) & ~PAGE_MASK) < - PAGE_SIZE - 10 * sizeof(long))){ - *addr = stack; - return 0; - } - - return do_syscall_stub(mm_idp, addr); -} - -long syscall_stub_data(struct mm_id * mm_idp, - unsigned long *data, int data_count, - void **addr, void **stub_addr) -{ - unsigned long *stack; - int ret = 0; - - /* If *addr still is uninitialized, it *must* contain NULL. - * Thus in this case do_syscall_stub correctly won't be called. - */ - if((((unsigned long) *addr) & ~PAGE_MASK) >= - PAGE_SIZE - (10 + data_count) * sizeof(long)) { - ret = do_syscall_stub(mm_idp, addr); - /* in case of error, don't overwrite data on stack */ - if(ret) - return ret; - } - - stack = check_init_stack(mm_idp, *addr); - *addr = stack; - - *stack = data_count * sizeof(long); - - memcpy(stack + 1, data, data_count * sizeof(long)); - - *stub_addr = (void *)(((unsigned long)(stack + 1) & ~PAGE_MASK) + - UML_CONFIG_STUB_DATA); - - return 0; -} - -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, - int done, void **data) -{ - int prot, ret; - - prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) | - (x ? PROT_EXEC : 0); - - 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 = - { .addr = virt, - .len = len, - .prot = prot, - .flags = MAP_SHARED | - MAP_FIXED, - .fd = phys_fd, - .offset= offset - } } } ); - ret = os_write_file(fd, &map, sizeof(map)); - if(ret != sizeof(map)) - printk("map : /proc/mm map failed, err = %d\n", -ret); - else ret = 0; - } - else { - unsigned long args[] = { virt, len, prot, - MAP_SHARED | MAP_FIXED, phys_fd, - MMAP_OFFSET(offset) }; - - ret = run_syscall_stub(mm_idp, STUB_MMAP_NR, args, virt, - data, done); - } - - return ret; -} - -int unmap(struct mm_id * mm_idp, void *addr, unsigned long len, int done, - void **data) -{ - int ret; - - 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 = - { .addr = - (unsigned long) addr, - .len = len } } } ); - ret = os_write_file(fd, &unmap, sizeof(unmap)); - if(ret != sizeof(unmap)) - printk("unmap - proc_mm write returned %d\n", ret); - else ret = 0; - } - else { - unsigned long args[] = { (unsigned long) addr, len, 0, 0, 0, - 0 }; - - ret = run_syscall_stub(mm_idp, __NR_munmap, args, 0, - data, done); - if(ret < 0) - printk("munmap stub failed, errno = %d\n", ret); - } - - return ret; -} - -int 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, ret; - - prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) | - (x ? PROT_EXEC : 0); - - if(proc_mm){ - int fd = mm_idp->u.mm_fd; - protect = ((struct proc_mm_op) { .op = MM_MPROTECT, - .u = - { .mprotect = - { .addr = - (unsigned long) addr, - .len = len, - .prot = prot } } } ); - - ret = os_write_file(fd, &protect, sizeof(protect)); - if(ret != sizeof(protect)) - printk("protect failed, err = %d", -ret); - else ret = 0; - } - else { - unsigned long args[] = { addr, len, prot, 0, 0, 0 }; - - ret = run_syscall_stub(mm_idp, __NR_mprotect, args, 0, - data, done); - } - - return ret; -} - -void before_mem_skas(unsigned long unused) -{ -} diff --git a/arch/um/os-Linux/skas/Makefile b/arch/um/os-Linux/skas/Makefile index eab5386d60a7..79cc6c72aa92 100644 --- a/arch/um/os-Linux/skas/Makefile +++ b/arch/um/os-Linux/skas/Makefile @@ -3,8 +3,8 @@ # Licensed under the GPL # -obj-y := trap.o +obj-y := mem.o trap.o -USER_OBJS := trap.o +USER_OBJS := mem.o trap.o include arch/um/scripts/Makefile.rules diff --git a/arch/um/os-Linux/skas/mem.c b/arch/um/os-Linux/skas/mem.c new file mode 100644 index 000000000000..9890e9090f58 --- /dev/null +++ b/arch/um/os-Linux/skas/mem.c @@ -0,0 +1,283 @@ +/* + * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) + * Licensed under the GPL + */ + +#include +#include +#include +#include +#include +#include +#include +#include "mem_user.h" +#include "mem.h" +#include "skas.h" +#include "user.h" +#include "os.h" +#include "proc_mm.h" +#include "ptrace_user.h" +#include "user_util.h" +#include "kern_util.h" +#include "task.h" +#include "registers.h" +#include "uml-config.h" +#include "sysdep/ptrace.h" +#include "sysdep/stub.h" + +extern unsigned long batch_syscall_stub, __syscall_stub_start; + +extern void wait_stub_done(int pid, int sig, char * fname); + +static inline unsigned long *check_init_stack(struct mm_id * mm_idp, + unsigned long *stack) +{ + if(stack == NULL) { + stack = (unsigned long *) mm_idp->stack + 2; + *stack = 0; + } + return stack; +} + +extern int proc_mm; + +int single_count = 0; +int multi_count = 0; +int multi_op_count = 0; + +static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr) +{ + unsigned long regs[MAX_REG_NR]; + int n; + long ret, offset; + unsigned long * data; + unsigned long * syscall; + int pid = mm_idp->u.pid; + + if(proc_mm) +#warning Need to look up userspace_pid by cpu + pid = userspace_pid[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); + + n = ptrace_setregs(pid, regs); + if(n < 0) + panic("do_syscall_stub : PTRACE_SETREGS failed, errno = %d\n", + n); + + wait_stub_done(pid, 0, "do_syscall_stub"); + + /* When the stub stops, we find the following values on the + * beginning of the stack: + * (long )return_value + * (long )offset to failed sycall-data (0, if no error) + */ + ret = *((unsigned long *) mm_idp->stack); + offset = *((unsigned long *) mm_idp->stack + 1); + if (offset) { + data = (unsigned long *)(mm_idp->stack + + offset - UML_CONFIG_STUB_DATA); + printk("do_syscall_stub : ret = %d, offset = %d, " + "data = 0x%x\n", ret, offset, data); + syscall = (unsigned long *)((unsigned long)data + data[0]); + printk("do_syscall_stub: syscall %ld failed, return value = " + "0x%lx, expected return value = 0x%lx\n", + syscall[0], ret, syscall[7]); + printk(" syscall parameters: " + "0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n", + syscall[1], syscall[2], syscall[3], + syscall[4], syscall[5], syscall[6]); + for(n = 1; n < data[0]/sizeof(long); n++) { + if(n == 1) + printk(" additional syscall data:"); + if(n % 4 == 1) + printk("\n "); + printk(" 0x%lx", data[n]); + } + if(n > 1) + printk("\n"); + } + else ret = 0; + + *addr = check_init_stack(mm_idp, NULL); + + return ret; +} + +long run_syscall_stub(struct mm_id * mm_idp, int syscall, + unsigned long *args, long expected, void **addr, + int done) +{ + unsigned long *stack = check_init_stack(mm_idp, *addr); + + if(done && *addr == NULL) + single_count++; + + *stack += sizeof(long); + stack += *stack / sizeof(long); + + *stack++ = syscall; + *stack++ = args[0]; + *stack++ = args[1]; + *stack++ = args[2]; + *stack++ = args[3]; + *stack++ = args[4]; + *stack++ = args[5]; + *stack++ = expected; + *stack = 0; + multi_op_count++; + + if(!done && ((((unsigned long) stack) & ~PAGE_MASK) < + PAGE_SIZE - 10 * sizeof(long))){ + *addr = stack; + return 0; + } + + return do_syscall_stub(mm_idp, addr); +} + +long syscall_stub_data(struct mm_id * mm_idp, + unsigned long *data, int data_count, + void **addr, void **stub_addr) +{ + unsigned long *stack; + int ret = 0; + + /* If *addr still is uninitialized, it *must* contain NULL. + * Thus in this case do_syscall_stub correctly won't be called. + */ + if((((unsigned long) *addr) & ~PAGE_MASK) >= + PAGE_SIZE - (10 + data_count) * sizeof(long)) { + ret = do_syscall_stub(mm_idp, addr); + /* in case of error, don't overwrite data on stack */ + if(ret) + return ret; + } + + stack = check_init_stack(mm_idp, *addr); + *addr = stack; + + *stack = data_count * sizeof(long); + + memcpy(stack + 1, data, data_count * sizeof(long)); + + *stub_addr = (void *)(((unsigned long)(stack + 1) & ~PAGE_MASK) + + UML_CONFIG_STUB_DATA); + + return 0; +} + +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, + int done, void **data) +{ + int prot, ret; + + prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) | + (x ? PROT_EXEC : 0); + + 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 = + { .addr = virt, + .len = len, + .prot = prot, + .flags = MAP_SHARED | + MAP_FIXED, + .fd = phys_fd, + .offset= offset + } } } ); + ret = os_write_file(fd, &map, sizeof(map)); + if(ret != sizeof(map)) + printk("map : /proc/mm map failed, err = %d\n", -ret); + else ret = 0; + } + else { + unsigned long args[] = { virt, len, prot, + MAP_SHARED | MAP_FIXED, phys_fd, + MMAP_OFFSET(offset) }; + + ret = run_syscall_stub(mm_idp, STUB_MMAP_NR, args, virt, + data, done); + } + + return ret; +} + +int unmap(struct mm_id * mm_idp, void *addr, unsigned long len, int done, + void **data) +{ + int ret; + + 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 = + { .addr = + (unsigned long) addr, + .len = len } } } ); + ret = os_write_file(fd, &unmap, sizeof(unmap)); + if(ret != sizeof(unmap)) + printk("unmap - proc_mm write returned %d\n", ret); + else ret = 0; + } + else { + unsigned long args[] = { (unsigned long) addr, len, 0, 0, 0, + 0 }; + + ret = run_syscall_stub(mm_idp, __NR_munmap, args, 0, + data, done); + } + + return ret; +} + +int 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, ret; + + prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) | + (x ? PROT_EXEC : 0); + if(proc_mm){ + int fd = mm_idp->u.mm_fd; + + protect = ((struct proc_mm_op) { .op = MM_MPROTECT, + .u = + { .mprotect = + { .addr = + (unsigned long) addr, + .len = len, + .prot = prot } } } ); + + ret = os_write_file(fd, &protect, sizeof(protect)); + if(ret != sizeof(protect)) + printk("protect failed, err = %d", -ret); + else ret = 0; + } + else { + unsigned long args[] = { addr, len, prot, 0, 0, 0 }; + + ret = run_syscall_stub(mm_idp, __NR_mprotect, args, 0, + data, done); + } + + return ret; +} + +void before_mem_skas(unsigned long unused) +{ +}