From: Paolo Bonzini <pbonzini@redhat.com>
To: kvm@vger.kernel.org
Subject: [PATCH v2 kvm-unit-tests 2/2] arm: add eabi version of 64-bit division functions
Date: Wed, 12 May 2021 12:54:40 +0200 [thread overview]
Message-ID: <20210512105440.748153-3-pbonzini@redhat.com> (raw)
In-Reply-To: <20210512105440.748153-1-pbonzini@redhat.com>
eabi prescribes different entry points for 64-bit division on
32-bit platforms. Implement a wrapper for the GCC-style __divmoddi4
and __udivmoddi4 functions.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arm/Makefile.arm | 1 +
lib/arm/ldivmod.S | 32 ++++++++++++++++++++++++++++++++
2 files changed, 33 insertions(+)
create mode 100644 lib/arm/ldivmod.S
diff --git a/arm/Makefile.arm b/arm/Makefile.arm
index 687a8ed..3a4cc6b 100644
--- a/arm/Makefile.arm
+++ b/arm/Makefile.arm
@@ -24,6 +24,7 @@ cflatobjs += lib/arm/spinlock.o
cflatobjs += lib/arm/processor.o
cflatobjs += lib/arm/stack.o
cflatobjs += lib/ldiv32.o
+cflatobjs += lib/arm/ldivmod.o
# arm specific tests
tests =
diff --git a/lib/arm/ldivmod.S b/lib/arm/ldivmod.S
new file mode 100644
index 0000000..de11ac9
--- /dev/null
+++ b/lib/arm/ldivmod.S
@@ -0,0 +1,32 @@
+// EABI ldivmod and uldivmod implementation based on libcompiler-rt
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses.
+
+ .syntax unified
+ .align 2
+ .globl __aeabi_uldivmod
+ .type __aeabi_uldivmod, %function
+__aeabi_uldivmod:
+ push {r11, lr}
+ sub sp, sp, #16
+ add r12, sp, #8
+ str r12, [sp] // third argument to __udivmoddi4
+ bl __udivmoddi4
+ ldr r2, [sp, #8] // remainder returned in r2-r3
+ ldr r3, [sp, #12]
+ add sp, sp, #16
+ pop {r11, pc}
+
+ .globl __aeabi_ldivmod
+ .type __aeabi_ldivmod, %function
+__aeabi_ldivmod:
+ push {r11, lr}
+ sub sp, sp, #16
+ add r12, sp, #8
+ str r12, [sp] // third argument to __divmoddi4
+ bl __divmoddi4
+ ldr r2, [sp, #8] // remainder returned in r2-r3
+ ldr r3, [sp, #12]
+ add sp, sp, #16
+ pop {r11, pc}
--
2.31.1
next prev parent reply other threads:[~2021-05-12 10:54 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-12 10:54 [PATCH v2 kvm-unit-tests 0/2] fix long division routines for ARM eabi Paolo Bonzini
2021-05-12 10:54 ` [PATCH v2 kvm-unit-tests 1/2] libcflat: clean up and complete long division routines Paolo Bonzini
2021-05-12 13:44 ` Alexandru Elisei
2021-05-12 10:54 ` Paolo Bonzini [this message]
2021-05-12 13:44 ` [PATCH v2 kvm-unit-tests 2/2] arm: add eabi version of 64-bit division functions Alexandru Elisei
2021-05-12 13:51 ` Paolo Bonzini
2021-05-12 14:04 ` Alexandru Elisei
2021-05-12 14:04 ` [PATCH v2 kvm-unit-tests 0/2] fix long division routines for ARM eabi Alexandru Elisei
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