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acrn-kernel
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sparc32: switch __bzero() away from range exception table entries 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-07-14 17:27:56 -04:00
parent 5f99d33810
commit df06c27ebd
1 changed files with 32 additions and 40 deletions
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72
arch/sparc/lib/memset.S
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@ -27,35 +27,44 @@
.text; \
.align 4
#define EXT(start,end,handler) \
#define STORE(source, base, offset, n) \
98: std source, [base + offset + n]; \
.section .fixup,ALLOC,EXECINSTR; \
.align 4; \
99: ba 30f; \
sub %o3, n - offset, %o3; \
.section __ex_table,ALLOC; \
.align 4; \
.word start, 0, end, handler; \
.word 98b, 99b; \
.text; \
.align 4
.align 4;
#define STORE_LAST(source, base, offset, n) \
EX(std source, [base - offset - n], \
add %o1, offset + n);
/* Please don't change these macros, unless you change the logic
* in the .fixup section below as well.
* Store 64 bytes at (BASE + OFFSET) using value SOURCE. */
#define ZERO_BIG_BLOCK(base, offset, source) \
std source, [base + offset + 0x00]; \
std source, [base + offset + 0x08]; \
std source, [base + offset + 0x10]; \
std source, [base + offset + 0x18]; \
std source, [base + offset + 0x20]; \
std source, [base + offset + 0x28]; \
std source, [base + offset + 0x30]; \
std source, [base + offset + 0x38];
#define ZERO_BIG_BLOCK(base, offset, source) \
STORE(source, base, offset, 0x00); \
STORE(source, base, offset, 0x08); \
STORE(source, base, offset, 0x10); \
STORE(source, base, offset, 0x18); \
STORE(source, base, offset, 0x20); \
STORE(source, base, offset, 0x28); \
STORE(source, base, offset, 0x30); \
STORE(source, base, offset, 0x38);
#define ZERO_LAST_BLOCKS(base, offset, source) \
std source, [base - offset - 0x38]; \
std source, [base - offset - 0x30]; \
std source, [base - offset - 0x28]; \
std source, [base - offset - 0x20]; \
std source, [base - offset - 0x18]; \
std source, [base - offset - 0x10]; \
std source, [base - offset - 0x08]; \
std source, [base - offset - 0x00];
STORE_LAST(source, base, offset, 0x38); \
STORE_LAST(source, base, offset, 0x30); \
STORE_LAST(source, base, offset, 0x28); \
STORE_LAST(source, base, offset, 0x20); \
STORE_LAST(source, base, offset, 0x18); \
STORE_LAST(source, base, offset, 0x10); \
STORE_LAST(source, base, offset, 0x08); \
STORE_LAST(source, base, offset, 0x00);
.text
.align 4
@ -120,8 +129,6 @@ __bzero:
ZERO_BIG_BLOCK(%o0, 0x00, %g2)
subcc %o3, 128, %o3
ZERO_BIG_BLOCK(%o0, 0x40, %g2)
11:
EXT(10b, 11b, 20f)
bne 10b
add %o0, 128, %o0
@ -136,7 +143,6 @@ __bzero:
jmp %o4
add %o0, %o2, %o0
12:
ZERO_LAST_BLOCKS(%o0, 0x48, %g2)
ZERO_LAST_BLOCKS(%o0, 0x08, %g2)
13:
@ -182,24 +188,10 @@ __bzero:
.section .fixup,#alloc,#execinstr
.align 4
20:
cmp %g2, 8
bleu 1f
and %o1, 0x7f, %o1
sub %g2, 9, %g2
add %o3, 64, %o3
1:
sll %g2, 3, %g2
add %o3, %o1, %o0
30:
and %o1, 0x7f, %o1
retl
sub %o0, %g2, %o0
21:
mov 8, %o0
and %o1, 7, %o1
sub %o0, %g2, %o0
sll %o0, 3, %o0
retl
add %o0, %o1, %o0
add %o3, %o1, %o0
.globl __bzero_end
__bzero_end: