xtensa: add __umulsidi3 helper

xtensa gcc-13 has changed multiplication handling and may now use
__umulsidi3 helper where it used to use __muldi3. As a result building
the kernel with the new gcc may fail with the following error:

    linux/init/main.c:1287: undefined reference to `__umulsidi3'

Fix the build by providing __umulsidi3 implementation for xtensa.

Cc: stable@vger.kernel.org # 5.18+
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

diff --git a/arch/xtensa/kernel/xtensa_ksyms.c b/arch/xtensa/kernel/xtensa_ksyms.c
index b0bc889..2a31b1a 100644 (file)
--- a/arch/xtensa/kernel/xtensa_ksyms.c
+++ b/arch/xtensa/kernel/xtensa_ksyms.c
@@ -62,6 +62,7 @@ extern int __modsi3(int, int);
 extern int __mulsi3(int, int);
 extern unsigned int __udivsi3(unsigned int, unsigned int);
 extern unsigned int __umodsi3(unsigned int, unsigned int);
+extern unsigned long long __umulsidi3(unsigned int, unsigned int);
 
 EXPORT_SYMBOL(__ashldi3);
 EXPORT_SYMBOL(__ashrdi3);
@@ -71,6 +72,7 @@ EXPORT_SYMBOL(__modsi3);
 EXPORT_SYMBOL(__mulsi3);
 EXPORT_SYMBOL(__udivsi3);
 EXPORT_SYMBOL(__umodsi3);
+EXPORT_SYMBOL(__umulsidi3);
 
 unsigned int __sync_fetch_and_and_4(volatile void *p, unsigned int v)
 {

diff --git a/arch/xtensa/lib/Makefile b/arch/xtensa/lib/Makefile
index d4e9c39..7ecef05 100644 (file)
--- a/arch/xtensa/lib/Makefile
+++ b/arch/xtensa/lib/Makefile
@@ -5,7 +5,7 @@
 
 lib-y  += memcopy.o memset.o checksum.o \
           ashldi3.o ashrdi3.o lshrdi3.o \
-          divsi3.o udivsi3.o modsi3.o umodsi3.o mulsi3.o \
+          divsi3.o udivsi3.o modsi3.o umodsi3.o mulsi3.o umulsidi3.o \
           usercopy.o strncpy_user.o strnlen_user.o
 lib-$(CONFIG_PCI) += pci-auto.o
 lib-$(CONFIG_KCSAN) += kcsan-stubs.o

diff --git a/arch/xtensa/lib/umulsidi3.S b/arch/xtensa/lib/umulsidi3.S
new file mode 100644 (file)
index 0000000..1360816
--- /dev/null
+++ b/arch/xtensa/lib/umulsidi3.S
@@ -0,0 +1,230 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later WITH GCC-exception-2.0 */
+#include <linux/linkage.h>
+#include <asm/asmmacro.h>
+#include <asm/core.h>
+
+#if !XCHAL_HAVE_MUL16 && !XCHAL_HAVE_MUL32 && !XCHAL_HAVE_MAC16
+#define XCHAL_NO_MUL 1
+#endif
+
+ENTRY(__umulsidi3)
+
+#ifdef __XTENSA_CALL0_ABI__
+       abi_entry(32)
+       s32i    a12, sp, 16
+       s32i    a13, sp, 20
+       s32i    a14, sp, 24
+       s32i    a15, sp, 28
+#elif XCHAL_NO_MUL
+       /* This is not really a leaf function; allocate enough stack space
+          to allow CALL12s to a helper function.  */
+       abi_entry(32)
+#else
+       abi_entry_default
+#endif
+
+#ifdef __XTENSA_EB__
+#define wh a2
+#define wl a3
+#else
+#define wh a3
+#define wl a2
+#endif /* __XTENSA_EB__ */
+
+       /* This code is taken from the mulsf3 routine in ieee754-sf.S.
+          See more comments there.  */
+
+#if XCHAL_HAVE_MUL32_HIGH
+       mull    a6, a2, a3
+       muluh   wh, a2, a3
+       mov     wl, a6
+
+#else /* ! MUL32_HIGH */
+
+#if defined(__XTENSA_CALL0_ABI__) && XCHAL_NO_MUL
+       /* a0 and a8 will be clobbered by calling the multiply function
+          but a8 is not used here and need not be saved.  */
+       s32i    a0, sp, 0
+#endif
+
+#if XCHAL_HAVE_MUL16 || XCHAL_HAVE_MUL32
+
+#define a2h a4
+#define a3h a5
+
+       /* Get the high halves of the inputs into registers.  */
+       srli    a2h, a2, 16
+       srli    a3h, a3, 16
+
+#define a2l a2
+#define a3l a3
+
+#if XCHAL_HAVE_MUL32 && !XCHAL_HAVE_MUL16
+       /* Clear the high halves of the inputs.  This does not matter
+          for MUL16 because the high bits are ignored.  */
+       extui   a2, a2, 0, 16
+       extui   a3, a3, 0, 16
+#endif
+#endif /* MUL16 || MUL32 */
+
+
+#if XCHAL_HAVE_MUL16
+
+#define do_mul(dst, xreg, xhalf, yreg, yhalf) \
+       mul16u  dst, xreg ## xhalf, yreg ## yhalf
+
+#elif XCHAL_HAVE_MUL32
+
+#define do_mul(dst, xreg, xhalf, yreg, yhalf) \
+       mull    dst, xreg ## xhalf, yreg ## yhalf
+
+#elif XCHAL_HAVE_MAC16
+
+/* The preprocessor insists on inserting a space when concatenating after
+   a period in the definition of do_mul below.  These macros are a workaround
+   using underscores instead of periods when doing the concatenation.  */
+#define umul_aa_ll umul.aa.ll
+#define umul_aa_lh umul.aa.lh
+#define umul_aa_hl umul.aa.hl
+#define umul_aa_hh umul.aa.hh
+
+#define do_mul(dst, xreg, xhalf, yreg, yhalf) \
+       umul_aa_ ## xhalf ## yhalf      xreg, yreg; \
+       rsr     dst, ACCLO
+
+#else /* no multiply hardware */
+
+#define set_arg_l(dst, src) \
+       extui   dst, src, 0, 16
+#define set_arg_h(dst, src) \
+       srli    dst, src, 16
+
+#ifdef __XTENSA_CALL0_ABI__
+#define do_mul(dst, xreg, xhalf, yreg, yhalf) \
+       set_arg_ ## xhalf (a13, xreg); \
+       set_arg_ ## yhalf (a14, yreg); \
+       call0   .Lmul_mulsi3; \
+       mov     dst, a12
+#else
+#define do_mul(dst, xreg, xhalf, yreg, yhalf) \
+       set_arg_ ## xhalf (a14, xreg); \
+       set_arg_ ## yhalf (a15, yreg); \
+       call12  .Lmul_mulsi3; \
+       mov     dst, a14
+#endif /* __XTENSA_CALL0_ABI__ */
+
+#endif /* no multiply hardware */
+
+       /* Add pp1 and pp2 into a6 with carry-out in a9.  */
+       do_mul(a6, a2, l, a3, h)        /* pp 1 */
+       do_mul(a11, a2, h, a3, l)       /* pp 2 */
+       movi    a9, 0
+       add     a6, a6, a11
+       bgeu    a6, a11, 1f
+       addi    a9, a9, 1
+1:
+       /* Shift the high half of a9/a6 into position in a9.  Note that
+          this value can be safely incremented without any carry-outs.  */
+       ssai    16
+       src     a9, a9, a6
+
+       /* Compute the low word into a6.  */
+       do_mul(a11, a2, l, a3, l)       /* pp 0 */
+       sll     a6, a6
+       add     a6, a6, a11
+       bgeu    a6, a11, 1f
+       addi    a9, a9, 1
+1:
+       /* Compute the high word into wh.  */
+       do_mul(wh, a2, h, a3, h)        /* pp 3 */
+       add     wh, wh, a9
+       mov     wl, a6
+
+#endif /* !MUL32_HIGH */
+
+#if defined(__XTENSA_CALL0_ABI__) && XCHAL_NO_MUL
+       /* Restore the original return address.  */
+       l32i    a0, sp, 0
+#endif
+#ifdef __XTENSA_CALL0_ABI__
+       l32i    a12, sp, 16
+       l32i    a13, sp, 20
+       l32i    a14, sp, 24
+       l32i    a15, sp, 28
+       abi_ret(32)
+#else
+       abi_ret_default
+#endif
+
+#if XCHAL_NO_MUL
+
+       .macro  do_addx2 dst, as, at, tmp
+#if XCHAL_HAVE_ADDX
+       addx2   \dst, \as, \at
+#else
+       slli    \tmp, \as, 1
+       add     \dst, \tmp, \at
+#endif
+       .endm
+
+       .macro  do_addx4 dst, as, at, tmp
+#if XCHAL_HAVE_ADDX
+       addx4   \dst, \as, \at
+#else
+       slli    \tmp, \as, 2
+       add     \dst, \tmp, \at
+#endif
+       .endm
+
+       .macro  do_addx8 dst, as, at, tmp
+#if XCHAL_HAVE_ADDX
+       addx8   \dst, \as, \at
+#else
+       slli    \tmp, \as, 3
+       add     \dst, \tmp, \at
+#endif
+       .endm
+
+       /* For Xtensa processors with no multiply hardware, this simplified
+          version of _mulsi3 is used for multiplying 16-bit chunks of
+          the floating-point mantissas.  When using CALL0, this function
+          uses a custom ABI: the inputs are passed in a13 and a14, the
+          result is returned in a12, and a8 and a15 are clobbered.  */
+       .align  4
+.Lmul_mulsi3:
+       abi_entry_default
+
+       .macro mul_mulsi3_body dst, src1, src2, tmp1, tmp2
+       movi    \dst, 0
+1:     add     \tmp1, \src2, \dst
+       extui   \tmp2, \src1, 0, 1
+       movnez  \dst, \tmp1, \tmp2
+
+       do_addx2 \tmp1, \src2, \dst, \tmp1
+       extui   \tmp2, \src1, 1, 1
+       movnez  \dst, \tmp1, \tmp2
+
+       do_addx4 \tmp1, \src2, \dst, \tmp1
+       extui   \tmp2, \src1, 2, 1
+       movnez  \dst, \tmp1, \tmp2
+
+       do_addx8 \tmp1, \src2, \dst, \tmp1
+       extui   \tmp2, \src1, 3, 1
+       movnez  \dst, \tmp1, \tmp2
+
+       srli    \src1, \src1, 4
+       slli    \src2, \src2, 4
+       bnez    \src1, 1b
+       .endm
+
+#ifdef __XTENSA_CALL0_ABI__
+       mul_mulsi3_body a12, a13, a14, a15, a8
+#else
+       /* The result will be written into a2, so save that argument in a4.  */
+       mov     a4, a2
+       mul_mulsi3_body a2, a4, a3, a5, a6
+#endif
+       abi_ret_default
+#endif /* XCHAL_NO_MUL */
+
+ENDPROC(__umulsidi3)