mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
7c0f6ba682
This was entirely automated, using the script by Al:
PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*<asm/uaccess.h>'
sed -i -e "s!$PATT!#include <linux/uaccess.h>!" \
$(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h)
to do the replacement at the end of the merge window.
Requested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
127 lines
3.3 KiB
C
127 lines
3.3 KiB
C
/* windows.c: Routines to deal with register window management
|
|
* at the C-code level.
|
|
*
|
|
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/string.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/smp.h>
|
|
|
|
#include <asm/cacheflush.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#include "kernel.h"
|
|
|
|
/* Do save's until all user register windows are out of the cpu. */
|
|
void flush_user_windows(void)
|
|
{
|
|
register int ctr asm("g5");
|
|
|
|
ctr = 0;
|
|
__asm__ __volatile__(
|
|
"\n1:\n\t"
|
|
"ld [%%g6 + %2], %%g4\n\t"
|
|
"orcc %%g0, %%g4, %%g0\n\t"
|
|
"add %0, 1, %0\n\t"
|
|
"bne 1b\n\t"
|
|
" save %%sp, -64, %%sp\n"
|
|
"2:\n\t"
|
|
"subcc %0, 1, %0\n\t"
|
|
"bne 2b\n\t"
|
|
" restore %%g0, %%g0, %%g0\n"
|
|
: "=&r" (ctr)
|
|
: "0" (ctr),
|
|
"i" ((const unsigned long)TI_UWINMASK)
|
|
: "g4", "cc");
|
|
}
|
|
|
|
static inline void shift_window_buffer(int first_win, int last_win, struct thread_info *tp)
|
|
{
|
|
int i;
|
|
|
|
for(i = first_win; i < last_win; i++) {
|
|
tp->rwbuf_stkptrs[i] = tp->rwbuf_stkptrs[i+1];
|
|
memcpy(&tp->reg_window[i], &tp->reg_window[i+1], sizeof(struct reg_window32));
|
|
}
|
|
}
|
|
|
|
/* Place as many of the user's current register windows
|
|
* on the stack that we can. Even if the %sp is unaligned
|
|
* we still copy the window there, the only case that we don't
|
|
* succeed is if the %sp points to a bum mapping altogether.
|
|
* setup_frame() and do_sigreturn() use this before shifting
|
|
* the user stack around. Future instruction and hardware
|
|
* bug workaround routines will need this functionality as
|
|
* well.
|
|
*/
|
|
void synchronize_user_stack(void)
|
|
{
|
|
struct thread_info *tp = current_thread_info();
|
|
int window;
|
|
|
|
flush_user_windows();
|
|
if(!tp->w_saved)
|
|
return;
|
|
|
|
/* Ok, there is some dirty work to do. */
|
|
for(window = tp->w_saved - 1; window >= 0; window--) {
|
|
unsigned long sp = tp->rwbuf_stkptrs[window];
|
|
|
|
/* Ok, let it rip. */
|
|
if (copy_to_user((char __user *) sp, &tp->reg_window[window],
|
|
sizeof(struct reg_window32)))
|
|
continue;
|
|
|
|
shift_window_buffer(window, tp->w_saved - 1, tp);
|
|
tp->w_saved--;
|
|
}
|
|
}
|
|
|
|
#if 0
|
|
/* An optimization. */
|
|
static inline void copy_aligned_window(void *dest, const void *src)
|
|
{
|
|
__asm__ __volatile__("ldd [%1], %%g2\n\t"
|
|
"ldd [%1 + 0x8], %%g4\n\t"
|
|
"std %%g2, [%0]\n\t"
|
|
"std %%g4, [%0 + 0x8]\n\t"
|
|
"ldd [%1 + 0x10], %%g2\n\t"
|
|
"ldd [%1 + 0x18], %%g4\n\t"
|
|
"std %%g2, [%0 + 0x10]\n\t"
|
|
"std %%g4, [%0 + 0x18]\n\t"
|
|
"ldd [%1 + 0x20], %%g2\n\t"
|
|
"ldd [%1 + 0x28], %%g4\n\t"
|
|
"std %%g2, [%0 + 0x20]\n\t"
|
|
"std %%g4, [%0 + 0x28]\n\t"
|
|
"ldd [%1 + 0x30], %%g2\n\t"
|
|
"ldd [%1 + 0x38], %%g4\n\t"
|
|
"std %%g2, [%0 + 0x30]\n\t"
|
|
"std %%g4, [%0 + 0x38]\n\t" : :
|
|
"r" (dest), "r" (src) :
|
|
"g2", "g3", "g4", "g5");
|
|
}
|
|
#endif
|
|
|
|
/* Try to push the windows in a threads window buffer to the
|
|
* user stack. Unaligned %sp's are not allowed here.
|
|
*/
|
|
|
|
void try_to_clear_window_buffer(struct pt_regs *regs, int who)
|
|
{
|
|
struct thread_info *tp = current_thread_info();
|
|
int window;
|
|
|
|
flush_user_windows();
|
|
for(window = 0; window < tp->w_saved; window++) {
|
|
unsigned long sp = tp->rwbuf_stkptrs[window];
|
|
|
|
if ((sp & 7) ||
|
|
copy_to_user((char __user *) sp, &tp->reg_window[window],
|
|
sizeof(struct reg_window32)))
|
|
do_exit(SIGILL);
|
|
}
|
|
tp->w_saved = 0;
|
|
}
|