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95 lines
2.6 KiB
Diff
95 lines
2.6 KiB
Diff
From 8d55cdc73b07dd56ae59a42bcc11cde82614334a Mon Sep 17 00:00:00 2001
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From: Frank Mehnert <frank.mehnert@kernkonzept.com>
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Date: Mon, 10 May 2021 00:00:00 +0000
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Subject: [PATCH] ia32: add implementation for '__udivmoddi4()'
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This function is implicitly required by code in jdb.cpp performing a
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64-bit integer division on 32-bit systems. This function is required
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by code generated with gcc-11. Code generated with older versions of
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gcc was satisfied with the existing implementation for '__udivdi3'.
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Also fix cosmetic issues in gcc_lib.c and add Doxygen documentation.
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Change-Id: If5b44a9e98429c4fc3eacdd5af8bdaf33c9c2a8f
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---
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src/lib/libk/gcc_lib.c | 49 +++++++++++++++++++++++++++++++++++-------
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1 file changed, 41 insertions(+), 8 deletions(-)
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diff --git a/src/lib/libk/gcc_lib.c b/src/lib/libk/gcc_lib.c
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index e5626145..b121cb63 100644
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--- a/src/lib/libk/gcc_lib.c
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+++ b/src/lib/libk/gcc_lib.c
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@@ -1,6 +1,8 @@
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unsigned long long __umoddi3(unsigned long long, unsigned long long);
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unsigned long long __udivdi3(unsigned long long, unsigned long long);
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+unsigned long long __udivmoddi4(unsigned long long, unsigned long long,
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+ unsigned long long *);
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struct llmoddiv_t
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{
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@@ -31,15 +33,15 @@ static struct llmoddiv_t llmoddiv(unsigned long long div, unsigned long long s)
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while (1)
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{
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if (div >= s)
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- {
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- div -= s;
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- i |= tmp;
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- }
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+ {
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+ div -= s;
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+ i |= tmp;
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+ }
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if (div == 0)
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- break;
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+ break;
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tmp >>= 1;
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if (!tmp)
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- break;
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+ break;
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s >>= 1;
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}
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@@ -47,8 +49,39 @@ static struct llmoddiv_t llmoddiv(unsigned long long div, unsigned long long s)
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}
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+/**
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+ * 64-bit unsigned modulo for 32-bit machines.
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+ *
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+ * \param div Dividend.
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+ * \param s Divisor.
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+ * \return div / s.
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+ */
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unsigned long long __umoddi3(unsigned long long div, unsigned long long s)
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-{ return llmoddiv(div,s).mod; }
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+{ return llmoddiv(div, s).mod; }
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+/**
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+ * 64-bit unsigned division for 32-bit machines.
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+ *
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+ * \param div Dividend.
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+ * \param s Divisor.
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+ * \return div / s.
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+ */
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unsigned long long __udivdi3(unsigned long long div, unsigned long long s)
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-{ return llmoddiv(div,s).div; }
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+{ return llmoddiv(div, s).div; }
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+
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+/**
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+ * 64-bit unsigned division + modulo for 32-bit machines.
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+ *
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+ * \param n Dividend.
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+ * \param d Divisor.
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+ * \param[out] r Pointer to the result holding div % s.
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+ * \return div / s.
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+ */
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+unsigned long long __udivmoddi4(unsigned long long div, unsigned long long s,
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+ unsigned long long *r)
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+{
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+ struct llmoddiv_t md = llmoddiv(div, s);
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+ if (r)
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+ *r = md.mod;
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+ return md.div;
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+}
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