diff options
Diffstat (limited to 'arch/sparc/lib/copy_in_user.S')
| -rw-r--r-- | arch/sparc/lib/copy_in_user.S | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/arch/sparc/lib/copy_in_user.S b/arch/sparc/lib/copy_in_user.S new file mode 100644 index 000000000..66e90bf52 --- /dev/null +++ b/arch/sparc/lib/copy_in_user.S @@ -0,0 +1,110 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* copy_in_user.S: Copy from userspace to userspace. + * + * Copyright (C) 1999, 2000, 2004 David S. Miller (davem@redhat.com) + */ + +#include <linux/linkage.h> +#include <asm/asi.h> +#include <asm/export.h> + +#define XCC xcc + +#define EX(x,y,z) \ +98: x,y; \ + .section __ex_table,"a";\ + .align 4; \ + .word 98b, z; \ + .text; \ + .align 4; + +#define EX_O4(x,y) EX(x,y,__retl_o4_plus_8) +#define EX_O2_4(x,y) EX(x,y,__retl_o2_plus_4) +#define EX_O2_1(x,y) EX(x,y,__retl_o2_plus_1) + + .register %g2,#scratch + .register %g3,#scratch + + .text +__retl_o4_plus_8: + add %o4, %o2, %o4 + retl + add %o4, 8, %o0 +__retl_o2_plus_4: + retl + add %o2, 4, %o0 +__retl_o2_plus_1: + retl + add %o2, 1, %o0 + + .align 32 + + /* Don't try to get too fancy here, just nice and + * simple. This is predominantly used for well aligned + * small copies in the compat layer. It is also used + * to copy register windows around during thread cloning. + */ + +ENTRY(raw_copy_in_user) /* %o0=dst, %o1=src, %o2=len */ + cmp %o2, 0 + be,pn %XCC, 85f + or %o0, %o1, %o3 + cmp %o2, 16 + bleu,a,pn %XCC, 80f + or %o3, %o2, %o3 + + /* 16 < len <= 64 */ + andcc %o3, 0x7, %g0 + bne,pn %XCC, 90f + nop + + andn %o2, 0x7, %o4 + and %o2, 0x7, %o2 +1: subcc %o4, 0x8, %o4 + EX_O4(ldxa [%o1] %asi, %o5) + EX_O4(stxa %o5, [%o0] %asi) + add %o1, 0x8, %o1 + bgu,pt %XCC, 1b + add %o0, 0x8, %o0 + andcc %o2, 0x4, %g0 + be,pt %XCC, 1f + nop + sub %o2, 0x4, %o2 + EX_O2_4(lduwa [%o1] %asi, %o5) + EX_O2_4(stwa %o5, [%o0] %asi) + add %o1, 0x4, %o1 + add %o0, 0x4, %o0 +1: cmp %o2, 0 + be,pt %XCC, 85f + nop + ba,pt %xcc, 90f + nop + +80: /* 0 < len <= 16 */ + andcc %o3, 0x3, %g0 + bne,pn %XCC, 90f + nop + +82: + subcc %o2, 4, %o2 + EX_O2_4(lduwa [%o1] %asi, %g1) + EX_O2_4(stwa %g1, [%o0] %asi) + add %o1, 4, %o1 + bgu,pt %XCC, 82b + add %o0, 4, %o0 + +85: retl + clr %o0 + + .align 32 +90: + subcc %o2, 1, %o2 + EX_O2_1(lduba [%o1] %asi, %g1) + EX_O2_1(stba %g1, [%o0] %asi) + add %o1, 1, %o1 + bgu,pt %XCC, 90b + add %o0, 1, %o0 + retl + clr %o0 +ENDPROC(raw_copy_in_user) +EXPORT_SYMBOL(raw_copy_in_user) |