mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-23 15:32:25 +00:00
95 lines
2.6 KiB
Diff
95 lines
2.6 KiB
Diff
From 8d55cdc73b07dd56ae59a42bcc11cde82614334a Mon Sep 17 00:00:00 2001
|
|
From: Frank Mehnert <frank.mehnert@kernkonzept.com>
|
|
Date: Mon, 10 May 2021 00:00:00 +0000
|
|
Subject: [PATCH] ia32: add implementation for '__udivmoddi4()'
|
|
|
|
This function is implicitly required by code in jdb.cpp performing a
|
|
64-bit integer division on 32-bit systems. This function is required
|
|
by code generated with gcc-11. Code generated with older versions of
|
|
gcc was satisfied with the existing implementation for '__udivdi3'.
|
|
|
|
Also fix cosmetic issues in gcc_lib.c and add Doxygen documentation.
|
|
|
|
Change-Id: If5b44a9e98429c4fc3eacdd5af8bdaf33c9c2a8f
|
|
---
|
|
src/lib/libk/gcc_lib.c | 49 +++++++++++++++++++++++++++++++++++-------
|
|
1 file changed, 41 insertions(+), 8 deletions(-)
|
|
|
|
diff --git a/src/lib/libk/gcc_lib.c b/src/lib/libk/gcc_lib.c
|
|
index e5626145..b121cb63 100644
|
|
--- a/src/lib/libk/gcc_lib.c
|
|
+++ b/src/lib/libk/gcc_lib.c
|
|
@@ -1,6 +1,8 @@
|
|
|
|
unsigned long long __umoddi3(unsigned long long, unsigned long long);
|
|
unsigned long long __udivdi3(unsigned long long, unsigned long long);
|
|
+unsigned long long __udivmoddi4(unsigned long long, unsigned long long,
|
|
+ unsigned long long *);
|
|
|
|
struct llmoddiv_t
|
|
{
|
|
@@ -31,15 +33,15 @@ static struct llmoddiv_t llmoddiv(unsigned long long div, unsigned long long s)
|
|
while (1)
|
|
{
|
|
if (div >= s)
|
|
- {
|
|
- div -= s;
|
|
- i |= tmp;
|
|
- }
|
|
+ {
|
|
+ div -= s;
|
|
+ i |= tmp;
|
|
+ }
|
|
if (div == 0)
|
|
- break;
|
|
+ break;
|
|
tmp >>= 1;
|
|
if (!tmp)
|
|
- break;
|
|
+ break;
|
|
s >>= 1;
|
|
}
|
|
|
|
@@ -47,8 +49,39 @@ static struct llmoddiv_t llmoddiv(unsigned long long div, unsigned long long s)
|
|
}
|
|
|
|
|
|
+/**
|
|
+ * 64-bit unsigned modulo for 32-bit machines.
|
|
+ *
|
|
+ * \param div Dividend.
|
|
+ * \param s Divisor.
|
|
+ * \return div / s.
|
|
+ */
|
|
unsigned long long __umoddi3(unsigned long long div, unsigned long long s)
|
|
-{ return llmoddiv(div,s).mod; }
|
|
+{ return llmoddiv(div, s).mod; }
|
|
|
|
+/**
|
|
+ * 64-bit unsigned division for 32-bit machines.
|
|
+ *
|
|
+ * \param div Dividend.
|
|
+ * \param s Divisor.
|
|
+ * \return div / s.
|
|
+ */
|
|
unsigned long long __udivdi3(unsigned long long div, unsigned long long s)
|
|
-{ return llmoddiv(div,s).div; }
|
|
+{ return llmoddiv(div, s).div; }
|
|
+
|
|
+/**
|
|
+ * 64-bit unsigned division + modulo for 32-bit machines.
|
|
+ *
|
|
+ * \param n Dividend.
|
|
+ * \param d Divisor.
|
|
+ * \param[out] r Pointer to the result holding div % s.
|
|
+ * \return div / s.
|
|
+ */
|
|
+unsigned long long __udivmoddi4(unsigned long long div, unsigned long long s,
|
|
+ unsigned long long *r)
|
|
+{
|
|
+ struct llmoddiv_t md = llmoddiv(div, s);
|
|
+ if (r)
|
|
+ *r = md.mod;
|
|
+ return md.div;
|
|
+}
|