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Provide sparc v8 multiply/divide routines which are copied over the base 

v7 versions on sun4m and sun4d machines. Based on Chris Torek's BSD/OS
code.
This commit is contained in:
pk 2002-11-27 16:08:34 +00:00
parent 28e7d3260f
commit ba4983b5db
1 changed files with 69 additions and 4 deletions
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73
sys/arch/sparc/sparc/locore.s
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@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.162 2002/08/17 02:23:18 uwe Exp $ */
/* $NetBSD: locore.s,v 1.163 2002/11/27 16:08:34 pk Exp $ */
/*
* Copyright (c) 1996 Paul Kranenburg
@ -3803,7 +3803,7 @@ no_3mmu:
beq 3f
nop
cmp %g4, CPU_SUN4D
bne 4f
bne 5f
3:
/*
@ -3854,7 +3854,8 @@ no_3mmu:
sta %o3, [%g0] ASI_SRMMU ! restore mmu-sreg
wr %o4, 0x0, %psr ! restore psr
b,a startmap_done
!b,a startmap_done
b,a 4f
/*
* The following is generic and should work on all
@ -3872,8 +3873,72 @@ remap_notvik:
add %o1, %o2, %o1
sta %l4, [%o1] ASI_BYPASS
!b,a startmap_done
4:
#define OVERWRITE(rtn, v8_rtn, len) \
set v8_rtn, %o0; \
set rtn, %o1; \
call _C_LABEL(bcopy); \
mov len, %o2
OVERWRITE(.mul, v8_smul, v8_smul_len)
OVERWRITE(.umul, v8_umul, v8_umul_len)
OVERWRITE(.div, v8_sdiv, v8_sdiv_len)
OVERWRITE(.udiv, v8_udiv, v8_udiv_len)
OVERWRITE(.rem, v8_srem, v8_srem_len)
OVERWRITE(.urem, v8_urem, v8_urem_len)
#undef OVERWRITE
b,a startmap_done
/*
* V8 multiply and divide routines, to be copied over the code
* for the V6/V7 routines. Seems a shame to spend the call, but....
* Note: while .umul and .smul return a 64-bit result in %o1%o0,
* gcc only really cares about the low 32 bits in %o0. This is
* really just gcc output, cleaned up a bit.
*/
v8_smul:
retl
smul %o0, %o1, %o0
v8_smul_len = .-v8_smul
v8_umul:
retl
umul %o0, %o1, %o0
!v8_umul_len = 2 * 4
v8_umul_len = .-v8_umul
v8_sdiv:
sra %o0, 31, %g2
wr %g2, 0, %y
nop; nop; nop
retl
sdiv %o0, %o1, %o0
v8_sdiv_len = .-v8_sdiv
v8_udiv:
wr %g0, 0, %y
nop; nop; nop
retl
udiv %o0, %o1, %o0
v8_udiv_len = .-v8_udiv
v8_srem:
sra %o0, 31, %g3
wr %g3, 0, %y
nop; nop; nop
sdiv %o0, %o1, %g2
smul %g2, %o1, %g2
retl
sub %o0, %g2, %o0
v8_srem_len = .-v8_srem
v8_urem:
wr %g0, 0, %y
nop; nop; nop
udiv %o0, %o1, %g2
smul %g2, %o1, %g2
retl
sub %o0, %g2, %o0
v8_urem_len = .-v8_urem
5:
#endif /* SUN4M || SUN4D */
! botch! We should blow up.