Add basic libmp support for the x86.
diff --git a/src/libmp/386/mkfile b/src/libmp/386/mkfile
new file mode 100644
index 0000000..06a0a98
--- /dev/null
+++ b/src/libmp/386/mkfile
@@ -0,0 +1,19 @@
+<$PLAN9/src/mkhdr
+
+LIB=libmp.a
+SFILES=\
+ mpdigdiv.s\
+ mpvecadd.s\
+ mpvecdigmuladd.s\
+ mpvecdigmulsub.s\
+ mpvecsub.s\
+
+HFILES=$PLAN9/include/mp.h ../port/dat.h
+
+OFILES=${SFILES:%.s=%.$O}
+
+UPDATE=mkfile\
+ $HFILES\
+ $SFILES\
+
+<$PLAN9/src/mksyslib
diff --git a/src/libmp/386/mpdigdiv.s b/src/libmp/386/mpdigdiv.s
new file mode 100644
index 0000000..f02e161
--- /dev/null
+++ b/src/libmp/386/mpdigdiv.s
@@ -0,0 +1,39 @@
+.text
+
+.p2align 2,0x90
+.globl mpdigdiv
+ .type mpdigdiv, @function
+mpdigdiv:
+ /* Prelude */
+ pushl %ebp
+ movl %ebx, -4(%esp) /* save on stack */
+
+ movl 8(%esp), %ebx
+ movl (%ebx), %eax
+ movl 4(%ebx), %edx
+
+ movl 12(%esp), %ebx
+ movl 16(%esp), %ebp
+ xorl %ecx, %ecx
+ cmpl %ebx, %edx /* dividend >= 2^32 * divisor */
+ jae divovfl
+ cmpl %ecx, %ebx /* divisor == 1 */
+ je divovfl
+ divl %ebx /* AX = DX:AX/BX */
+ movl %eax, (%ebp)
+ jmp done
+
+ /* return all 1's */
+divovfl:
+ notl %ecx
+ movl %ecx, (%ebp)
+
+done:
+ /* Postlude */
+ movl -4(%esp), %ebx /* restore from stack */
+ movl %esp, %ebp
+ leave
+ ret
+
+.endmpdigdiv:
+ .size mpdigdiv,.endmpdigdiv-mpdigdiv
diff --git a/src/libmp/386/mpvecadd.s b/src/libmp/386/mpvecadd.s
new file mode 100644
index 0000000..1f23dcd
--- /dev/null
+++ b/src/libmp/386/mpvecadd.s
@@ -0,0 +1,73 @@
+/*
+ * mpvecadd(mpdigit *a, int alen, mpdigit *b, int blen, mpdigit *sum)
+ *
+ * sum[0:alen] = a[0:alen-1] + b[0:blen-1]
+ *
+ * prereq: alen >= blen, sum has room for alen+1 digits
+ */
+
+.text
+
+.p2align 2,0x90
+.globl mpvecadd
+ .type mpvecadd, @function
+mpvecadd:
+ /* Prelude */
+ pushl %ebp
+ movl %ebx, -4(%esp) /* save on stack */
+ movl %esi, -8(%esp)
+ movl %edi, -12(%esp)
+
+ movl 12(%esp), %edx /* alen */
+ movl 20(%esp), %ecx /* blen */
+ movl 8(%esp), %esi /* a */
+ movl 16(%esp), %ebx /* b */
+ subl %ecx, %edx
+ movl 24(%esp), %edi /* sum */
+ xorl %ebp, %ebp /* this also sets carry to 0 */
+
+ /* skip addition if b is zero */
+ testl %ecx,%ecx
+ je _add1
+
+ /* sum[0:blen-1],carry = a[0:blen-1] + b[0:blen-1] */
+_addloop1:
+ movl (%esi, %ebp, 4), %eax
+ adcl (%ebx, %ebp, 4), %eax
+ movl %eax, (%edi, %ebp, 4)
+ incl %ebp
+ loop _addloop1
+
+_add1:
+ /* jump if alen > blen */
+ incl %edx
+ movl %edx, %ecx
+ loop _addloop2
+
+ /* sum[alen] = carry */
+_addend:
+ jb _addcarry
+ movl $0, (%edi, %ebp, 4)
+ jmp done
+
+_addcarry:
+ movl $1, (%edi, %ebp, 4)
+ jmp done
+
+ /* sum[blen:alen-1],carry = a[blen:alen-1] + 0 */
+_addloop2:
+ movl (%esi, %ebp, 4),%eax
+ adcl $0, %eax
+ movl %eax, (%edi, %ebp, 4)
+ incl %ebp
+ loop _addloop2
+ jmp _addend
+
+done:
+ /* Postlude */
+ movl -4(%esp), %ebx /* restore from stack */
+ movl -8(%esp), %esi
+ movl -12(%esp), %edi
+ movl %esp, %ebp
+ leave
+ ret
diff --git a/src/libmp/386/mpvecdigmuladd.s b/src/libmp/386/mpvecdigmuladd.s
new file mode 100644
index 0000000..987c633
--- /dev/null
+++ b/src/libmp/386/mpvecdigmuladd.s
@@ -0,0 +1,69 @@
+/*
+ * mpvecdigmul(mpdigit *b, int n, mpdigit m, mpdigit *p)
+ *
+ * p += b*m
+ *
+ * each step look like:
+ * hi,lo = m*b[i]
+ * lo += oldhi + carry
+ * hi += carry
+ * p[i] += lo
+ * oldhi = hi
+ *
+ * the registers are:
+ * hi = DX - constrained by hardware
+ * lo = AX - constrained by hardware
+ * b+n = SI - can't be BP
+ * p+n = DI - can't be BP
+ * i-n = BP
+ * m = BX
+ * oldhi = CX
+ *
+ */
+.text
+
+.p2align 2,0x90
+.globl mpvecdigmuladd
+ .type mpvecdigmuladd, @function
+mpvecdigmuladd:
+ /* Prelude */
+ pushl %ebp
+ movl %ebx, -4(%esp) /* save on stack */
+ movl %esi, -8(%esp)
+ movl %edi, -12(%esp)
+
+ movl 8(%esp), %esi /* b */
+ movl 12(%esp), %ecx /* n */
+ movl 16(%esp), %ebx /* m */
+ movl 20(%esp), %edi /* p */
+ movl %ecx, %ebp
+ negl %ebp /* BP = -n */
+ shll $2, %ecx
+ addl %ecx, %esi /* SI = b + n */
+ addl %ecx, %edi /* DI = p + n */
+ xorl %ecx, %ecx
+_muladdloop:
+ movl (%esi, %ebp, 4), %eax /* lo = b[i] */
+ mull %ebx /* hi, lo = b[i] * m */
+ addl %ecx,%eax /* lo += oldhi */
+ jae _muladdnocarry1
+ incl %edx /* hi += carry */
+_muladdnocarry1:
+ addl %eax, (%edi, %ebp, 4) /* p[i] += lo */
+ jae _muladdnocarry2
+ incl %edx /* hi += carry */
+_muladdnocarry2:
+ movl %edx, %ecx /* oldhi = hi */
+ incl %ebp /* i++ */
+ jnz _muladdloop
+ xorl %eax, %eax
+ addl %ecx, (%edi, %ebp, 4) /* p[n] + oldhi */
+ adcl %eax, %eax /* return carry out of p[n] */
+
+ /* Postlude */
+ movl -4(%esp), %ebx /* restore from stack */
+ movl -8(%esp), %esi
+ movl -12(%esp), %edi
+ movl %esp, %ebp
+ leave
+ ret
diff --git a/src/libmp/386/mpvecdigmulsub.s b/src/libmp/386/mpvecdigmulsub.s
new file mode 100644
index 0000000..47089c8
--- /dev/null
+++ b/src/libmp/386/mpvecdigmulsub.s
@@ -0,0 +1,78 @@
+/*
+ * mpvecdigmulsub(mpdigit *b, int n, mpdigit m, mpdigit *p)
+ *
+ * p -= b*m
+ *
+ * each step look like:
+ * hi,lo = m*b[i]
+ * lo += oldhi + carry
+ * hi += carry
+ * p[i] += lo
+ * oldhi = hi
+ *
+ * the registers are:
+ * hi = DX - constrained by hardware
+ * lo = AX - constrained by hardware
+ * b = SI - can't be BP
+ * p = DI - can't be BP
+ * i = BP
+ * n = CX - constrained by LOOP instr
+ * m = BX
+ * oldhi = EX
+ *
+ */
+.text
+
+/* XXX: had to use "-4(%esp)" kludge to get around inability to
+ * push/pop without first adjusting %esp. This may not be
+ * as fast as using push/pop (and accessing pushed element
+ * with "(%esp)".)
+ */
+
+.p2align 2,0x90
+.globl mpvecdigmulsub
+ .type mpvecdigmulsub, @function
+mpvecdigmulsub:
+ /* Prelude */
+ pushl %ebp
+ movl %ebx, -8(%esp) /* save on stack */
+ movl %esi, -12(%esp)
+ movl %edi, -16(%esp)
+
+ movl 8(%esp), %esi /* b */
+ movl 12(%esp), %ecx /* n */
+ movl 16(%esp), %ebx /* m */
+ movl 20(%esp), %edi /* p */
+ xorl %ebp, %ebp
+ movl %ebp, -4(%esp)
+_mulsubloop:
+ movl (%esi, %ebp, 4),%eax /* lo = b[i] */
+ mull %ebx /* hi, lo = b[i] * m */
+ addl -4(%esp), %eax /* lo += oldhi */
+ jae _mulsubnocarry1
+ incl %edx /* hi += carry */
+_mulsubnocarry1:
+ subl %eax, (%edi, %ebp, 4)
+ jae _mulsubnocarry2
+ incl %edx /* hi += carry */
+_mulsubnocarry2:
+ movl %edx, -4(%esp)
+ incl %ebp
+ loop _mulsubloop
+ movl -4(%esp), %eax
+ subl %eax, (%edi, %ebp, 4)
+ jae _mulsubnocarry3
+ movl $-1, %eax
+ jmp done
+
+_mulsubnocarry3:
+ movl $1, %eax
+
+done:
+ /* Postlude */
+ movl -8(%esp), %ebx /* restore from stack */
+ movl -12(%esp), %esi
+ movl -16(%esp), %edi
+ movl %esp, %ebp
+ leave
+ ret
diff --git a/src/libmp/386/mpvecsub.s b/src/libmp/386/mpvecsub.s
new file mode 100644
index 0000000..a56b496
--- /dev/null
+++ b/src/libmp/386/mpvecsub.s
@@ -0,0 +1,62 @@
+/*
+ * mpvecsub(mpdigit *a, int alen, mpdigit *b, int blen, mpdigit *diff)
+ *
+ * diff[0:alen-1] = a[0:alen-1] - b[0:blen-1]
+ *
+ * prereq: alen >= blen, diff has room for alen digits
+ */
+.text
+
+.p2align 2,0x90
+.globl mpvecsub
+ .type mpvecsub, @function
+mpvecsub:
+ /* Prelude */
+ pushl %ebp
+ movl %ebx, -4(%esp) /* save on stack */
+ movl %esi, -8(%esp)
+ movl %edi, -12(%esp)
+
+ movl 8(%esp), %esi /* a */
+ movl 16(%esp), %ebx /* b */
+ movl 12(%esp), %edx /* alen */
+ movl 20(%esp), %ecx /* blen */
+ movl 24(%esp), %edi /* diff */
+ subl %ecx,%edx
+ xorl %ebp,%ebp /* this also sets carry to 0 */
+
+ /* skip subraction if b is zero */
+ testl %ecx,%ecx
+ jz _sub1
+
+ /* diff[0:blen-1],borrow = a[0:blen-1] - b[0:blen-1] */
+_subloop1:
+ movl (%esi, %ebp, 4), %eax
+ sbbl (%ebx, %ebp, 4), %eax
+ movl %eax, (%edi, %ebp, 4)
+ incl %ebp
+ loop _subloop1
+
+_sub1:
+ incl %edx
+ movl %edx,%ecx
+ loop _subloop2
+ jmp done
+
+ /* diff[blen:alen-1] = a[blen:alen-1] - 0 */
+_subloop2:
+ movl (%esi, %ebp, 4), %eax
+ sbbl $0, %eax
+ movl %eax, (%edi, %ebp, 4)
+ INCL %ebp
+ LOOP _subloop2
+
+done:
+ /* Postlude */
+ movl -4(%esp), %ebx /* restore from stack */
+ movl -8(%esp), %esi
+ movl -12(%esp), %edi
+ movl %esp, %ebp
+ leave
+ ret
+
diff --git a/src/libmp/mkfile b/src/libmp/mkfile
index aab5746..417804d 100644
--- a/src/libmp/mkfile
+++ b/src/libmp/mkfile
@@ -2,6 +2,6 @@
DIRS=\
port\
-# $systype-$objtype\
+ $objtype\
<$PLAN9/src/mkdirs
diff --git a/src/libmp/port/mkfile b/src/libmp/port/mkfile
index a9176dd..682c676 100644
--- a/src/libmp/port/mkfile
+++ b/src/libmp/port/mkfile
@@ -33,10 +33,9 @@
mptov\
mptouv\
-OFILES=${FILES:%=%.$O}
-
+ALLOFILES=${FILES:%=%.$O}
# cull things in the per-machine directories from this list
-# OFILES= `{sh ./reduce $O $objtype $ALLOFILES}
+OFILES= `{sh ./reduce $O $objtype $ALLOFILES}
HFILES=\
$PLAN9/include/lib9.h\
@@ -44,3 +43,6 @@
dat.h\
<$PLAN9/src/mksyslib
+
+poot:
+ echo $OFILES
diff --git a/src/libmp/port/reduce b/src/libmp/port/reduce
index a857a28..b398075 100644
--- a/src/libmp/port/reduce
+++ b/src/libmp/port/reduce
@@ -3,14 +3,6 @@
objtype=$1
shift
-ls -p ../$objtype/*.[cs] >[2]/dev/null | sed 's/..$//' > /tmp/reduce.$pid
-#
-# if empty directory, just return the input files
-#
-if (! ~ $status '|') {
- echo $*
- rm /tmp/reduce.$pid
- exit 0
-}
-echo $* | tr ' ' \012 | grep -v -f /tmp/reduce.$pid | tr \012 ' '
-rm /tmp/reduce.$pid
+reduce="("`ls -p ../$objtype/*.[cs] 2>/dev/null | sed 's/..$//' | sed 's/^.*\///' | tr '\012' '|' | sed 's/.$//'`")"
+
+echo $* | tr ' ' '\012' | egrep -v $reduce | tr \012 ' '
