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Diffstat (limited to 'include/asm-arm26/uaccess-asm.h')
| -rw-r--r-- | include/asm-arm26/uaccess-asm.h | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/include/asm-arm26/uaccess-asm.h b/include/asm-arm26/uaccess-asm.h new file mode 100644 index 000000000000..19f798e338c9 --- /dev/null +++ b/include/asm-arm26/uaccess-asm.h @@ -0,0 +1,153 @@ +/* + * linux/include/asm-arm/proc-armo/uaccess.h + * + * Copyright (C) 1996 Russell King + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +/* + * The fs functions are implemented on the ARM2 and ARM3 architectures + * manually. + * Use *_user functions to access user memory with faulting behaving + * as though the user is accessing the memory. + * Use set_fs(get_ds()) and then the *_user functions to allow them to + * access kernel memory. + */ + +/* + * These are the values used to represent the user `fs' and the kernel `ds' + * FIXME - the KERNEL_DS should end at 0x03000000 but we want to access ROM at + * 0x03400000. ideally we want to forbid access to the IO space inbetween. + */ +#define KERNEL_DS 0x03FFFFFF +#define USER_DS 0x02000000 + +extern uaccess_t uaccess_user, uaccess_kernel; + +static inline void set_fs (mm_segment_t fs) +{ + current_thread_info()->addr_limit = fs; + current->thread.uaccess = (fs == USER_DS ? &uaccess_user : &uaccess_kernel); +} + +#define __range_ok(addr,size) ({ \ + unsigned long flag, sum; \ + __asm__ __volatile__("subs %1, %0, %3; cmpcs %1, %2; movcs %0, #0" \ + : "=&r" (flag), "=&r" (sum) \ + : "r" (addr), "Ir" (size), "0" (current_thread_info()->addr_limit) \ + : "cc"); \ + flag; }) + +#define __addr_ok(addr) ({ \ + unsigned long flag; \ + __asm__ __volatile__("cmp %2, %0; movlo %0, #0" \ + : "=&r" (flag) \ + : "0" (current_thread_info()->addr_limit), "r" (addr) \ + : "cc"); \ + (flag == 0); }) + +#define __put_user_asm_byte(x,addr,err) \ + __asm__ __volatile__( \ + " mov r0, %1\n" \ + " mov r1, %2\n" \ + " mov r2, %0\n" \ + " mov lr, pc\n" \ + " mov pc, %3\n" \ + " mov %0, r2\n" \ + : "=r" (err) \ + : "r" (x), "r" (addr), "r" (current->thread.uaccess->put_byte), \ + "0" (err) \ + : "r0", "r1", "r2", "lr") + +#define __put_user_asm_half(x,addr,err) \ + __asm__ __volatile__( \ + " mov r0, %1\n" \ + " mov r1, %2\n" \ + " mov r2, %0\n" \ + " mov lr, pc\n" \ + " mov pc, %3\n" \ + " mov %0, r2\n" \ + : "=r" (err) \ + : "r" (x), "r" (addr), "r" (current->thread.uaccess->put_half), \ + "0" (err) \ + : "r0", "r1", "r2", "lr") + +#define __put_user_asm_word(x,addr,err) \ + __asm__ __volatile__( \ + " mov r0, %1\n" \ + " mov r1, %2\n" \ + " mov r2, %0\n" \ + " mov lr, pc\n" \ + " mov pc, %3\n" \ + " mov %0, r2\n" \ + : "=r" (err) \ + : "r" (x), "r" (addr), "r" (current->thread.uaccess->put_word), \ + "0" (err) \ + : "r0", "r1", "r2", "lr") + +#define __put_user_asm_dword(x,addr,err) \ + __asm__ __volatile__( \ + " mov r0, %1\n" \ + " mov r1, %2\n" \ + " mov r2, %0\n" \ + " mov lr, pc\n" \ + " mov pc, %3\n" \ + " mov %0, r2\n" \ + : "=r" (err) \ + : "r" (x), "r" (addr), "r" (current->thread.uaccess->put_dword), \ + "0" (err) \ + : "r0", "r1", "r2", "lr") + +#define __get_user_asm_byte(x,addr,err) \ + __asm__ __volatile__( \ + " mov r0, %2\n" \ + " mov r1, %0\n" \ + " mov lr, pc\n" \ + " mov pc, %3\n" \ + " mov %0, r1\n" \ + " mov %1, r0\n" \ + : "=r" (err), "=r" (x) \ + : "r" (addr), "r" (current->thread.uaccess->get_byte), "0" (err) \ + : "r0", "r1", "r2", "lr") + +#define __get_user_asm_half(x,addr,err) \ + __asm__ __volatile__( \ + " mov r0, %2\n" \ + " mov r1, %0\n" \ + " mov lr, pc\n" \ + " mov pc, %3\n" \ + " mov %0, r1\n" \ + " mov %1, r0\n" \ + : "=r" (err), "=r" (x) \ + : "r" (addr), "r" (current->thread.uaccess->get_half), "0" (err) \ + : "r0", "r1", "r2", "lr") + +#define __get_user_asm_word(x,addr,err) \ + __asm__ __volatile__( \ + " mov r0, %2\n" \ + " mov r1, %0\n" \ + " mov lr, pc\n" \ + " mov pc, %3\n" \ + " mov %0, r1\n" \ + " mov %1, r0\n" \ + : "=r" (err), "=r" (x) \ + : "r" (addr), "r" (current->thread.uaccess->get_word), "0" (err) \ + : "r0", "r1", "r2", "lr") + +#define __do_copy_from_user(to,from,n) \ + (n) = current->thread.uaccess->copy_from_user((to),(from),(n)) + +#define __do_copy_to_user(to,from,n) \ + (n) = current->thread.uaccess->copy_to_user((to),(from),(n)) + +#define __do_clear_user(addr,sz) \ + (sz) = current->thread.uaccess->clear_user((addr),(sz)) + +#define __do_strncpy_from_user(dst,src,count,res) \ + (res) = current->thread.uaccess->strncpy_from_user(dst,src,count) + +#define __do_strnlen_user(s,n,res) \ + (res) = current->thread.uaccess->strnlen_user(s,n) |