hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

[ARM] 5320/1: fix assembly constraints in implementation of do_div() 

Those inline assembly segments using the umlal instruction must have
the & modifier so to be sure that a purely input register won't alias
one of the registers used as input+output.  In most cases, the inputs
are still used after the outputs are touched, and most binutil versions
insist on "rdhi, rdlo and rm must all be different" even for ARMv6+.

Signed-off-by: Nicolas Pitre <nico@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Nicolas Pitre 2008-10-23 04:34:08 +01:00 committed by Russell King
parent f80a3bb252
commit 884afaab44
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/arm/include/asm/div64.h
View File

@ -165,7 +165,7 @@
__res = __m; \ __res = __m; \
asm ( "umlal %Q0, %R0, %Q1, %Q2\n\t" \ asm ( "umlal %Q0, %R0, %Q1, %Q2\n\t" \
"mov %Q0, #0" \ "mov %Q0, #0" \
: "+r" (__res) \ : "+&r" (__res) \
: "r" (__m), "r" (__n) \ : "r" (__m), "r" (__n) \
: "cc" ); \ : "cc" ); \
} else { \ } else { \
@ -182,7 +182,7 @@
"umlal %R0, %Q0, %Q1, %R2\n\t" \ "umlal %R0, %Q0, %Q1, %R2\n\t" \
"mov %R0, #0\n\t" \ "mov %R0, #0\n\t" \
"umlal %Q0, %R0, %R1, %R2" \ "umlal %Q0, %R0, %R1, %R2" \
: "+r" (__res) \ : "+&r" (__res) \
: "r" (__m), "r" (__n) \ : "r" (__m), "r" (__n) \
: "cc" ); \ : "cc" ); \
} else { \ } else { \
@ -192,7 +192,7 @@
"adds %Q0, %1, %Q0\n\t" \ "adds %Q0, %1, %Q0\n\t" \
"adc %R0, %R0, #0\n\t" \ "adc %R0, %R0, #0\n\t" \
"umlal %Q0, %R0, %R2, %R3" \ "umlal %Q0, %R0, %R2, %R3" \
: "+r" (__res), "+r" (__z) \ : "+&r" (__res), "+&r" (__z) \
: "r" (__m), "r" (__n) \ : "r" (__m), "r" (__n) \
: "cc" ); \ : "cc" ); \
} \ } \