From efb80e7e097d0888e59fbbe4ded2ac5a256f556d Mon Sep 17 00:00:00 2001 From: Kyle McMartin Date: Thu, 18 Oct 2007 00:06:26 -0700 Subject: [PARISC] import necessary bits of libgcc.a Currently we're hacking libs-y to include libgcc.a, but this has unforeseen consequences since the userspace libgcc is linked with fpregs enabled. We need the kernel to stop using fpregs in an uncontrolled manner to implement lazy fpu state saves. Signed-off-by: Kyle McMartin --- arch/parisc/lib/libgcc/__umulsidi3.c | 46 ++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 arch/parisc/lib/libgcc/__umulsidi3.c (limited to 'arch/parisc/lib/libgcc/__umulsidi3.c') diff --git a/arch/parisc/lib/libgcc/__umulsidi3.c b/arch/parisc/lib/libgcc/__umulsidi3.c new file mode 100644 index 000000000000..396f669164d4 --- /dev/null +++ b/arch/parisc/lib/libgcc/__umulsidi3.c @@ -0,0 +1,46 @@ +#include "libgcc.h" + +#define __ll_B ((u32) 1 << (32 / 2)) +#define __ll_lowpart(t) ((u32) (t) & (__ll_B - 1)) +#define __ll_highpart(t) ((u32) (t) >> 16) + +#define umul_ppmm(w1, w0, u, v) \ + do { \ + u32 __x0, __x1, __x2, __x3; \ + u16 __ul, __vl, __uh, __vh; \ + \ + __ul = __ll_lowpart (u); \ + __uh = __ll_highpart (u); \ + __vl = __ll_lowpart (v); \ + __vh = __ll_highpart (v); \ + \ + __x0 = (u32) __ul * __vl; \ + __x1 = (u32) __ul * __vh; \ + __x2 = (u32) __uh * __vl; \ + __x3 = (u32) __uh * __vh; \ + \ + __x1 += __ll_highpart (__x0);/* this can't give carry */ \ + __x1 += __x2; /* but this indeed can */ \ + if (__x1 < __x2) /* did we get it? */ \ + __x3 += __ll_B; /* yes, add it in the proper pos. */ \ + \ + (w1) = __x3 + __ll_highpart (__x1); \ + (w0) = __ll_lowpart (__x1) * __ll_B + __ll_lowpart (__x0); \ + } while (0) + +union DWunion { + struct { + s32 high; + s32 low; + } s; + s64 ll; +}; + +u64 __umulsidi3(u32 u, u32 v) +{ + union DWunion __w; + + umul_ppmm(__w.s.high, __w.s.low, u, v); + + return __w.ll; +} -- cgit v1.2.1