diff options
Diffstat (limited to 'debian/patches/0004-i386-specialize-copyinmsg-and-copyoutmsg.patch')
| -rw-r--r-- | debian/patches/0004-i386-specialize-copyinmsg-and-copyoutmsg.patch | 139 |
1 files changed, 0 insertions, 139 deletions
diff --git a/debian/patches/0004-i386-specialize-copyinmsg-and-copyoutmsg.patch b/debian/patches/0004-i386-specialize-copyinmsg-and-copyoutmsg.patch deleted file mode 100644 index 1139e74..0000000 --- a/debian/patches/0004-i386-specialize-copyinmsg-and-copyoutmsg.patch +++ /dev/null @@ -1,139 +0,0 @@ -From d3f20b06cee70fd5afe8aaff31614756a57e6bb6 Mon Sep 17 00:00:00 2001 -From: Justus Winter <4winter@informatik.uni-hamburg.de> -Date: Fri, 19 Dec 2014 01:51:58 +0100 -Subject: [PATCH gnumach 4/4] i386: specialize `copyinmsg' and `copyoutmsg' - -Previously, `copyinmsg' was the same function as `copyin'. The former -is for messages, and the size of messages is a multiple of four. -Likewise for `copyoutmsg'. - -Provide a specialized version of both functions. This shaves off a -couple of instructions and improves our IPC performance. - -* i386/i386/locore.S (copyinmsg): New function. -(copyoutmsg): New function. ---- - i386/i386/locore.S | 83 +++++++++++++++++++++++++++++++++++++++++++++++++++--- - 1 file changed, 79 insertions(+), 4 deletions(-) - -diff --git a/i386/i386/locore.S b/i386/i386/locore.S -index 2e04bb8..cfda86f 100644 ---- a/i386/i386/locore.S -+++ b/i386/i386/locore.S -@@ -1232,13 +1232,12 @@ ENTRY(discover_x86_cpu_type) - */ - - /* -- * Copy from user address space. -+ * Copy from user address space - generic version. - * arg0: user address - * arg1: kernel address - * arg2: byte count - */ - ENTRY(copyin) --Entry(copyinmsg) - pushl %esi - pushl %edi /* save registers */ - -@@ -1275,13 +1274,48 @@ copyin_fail: - jmp copyin_ret /* pop frame and return */ - - /* -- * Copy to user address space. -+ * Copy from user address space - version for copying messages. -+ * arg0: user address -+ * arg1: kernel address -+ * arg2: byte count - must be a multiple of four -+ */ -+ENTRY(copyinmsg) -+ pushl %esi -+ pushl %edi /* save registers */ -+ -+ movl 8+S_ARG0,%esi /* get user start address */ -+ movl 8+S_ARG1,%edi /* get kernel destination address */ -+ movl 8+S_ARG2,%ecx /* get count */ -+ -+ movl $USER_DS,%eax /* use user data segment for accesses */ -+ mov %ax,%ds -+ -+ /*cld*/ /* count up: default mode in all GCC code */ -+ shrl $2,%ecx -+ RECOVER(copyinmsg_fail) -+ rep -+ movsl /* move longwords */ -+ xorl %eax,%eax /* return 0 for success */ -+ -+copyinmsg_ret: -+ mov %ss,%di /* restore DS to kernel segment */ -+ mov %di,%ds -+ -+ popl %edi /* restore registers */ -+ popl %esi -+ ret /* and return */ -+ -+copyinmsg_fail: -+ movl $1,%eax /* return 1 for failure */ -+ jmp copyinmsg_ret /* pop frame and return */ -+ -+/* -+ * Copy to user address space - generic version. - * arg0: kernel address - * arg1: user address - * arg2: byte count - */ - ENTRY(copyout) --Entry(copyoutmsg) - pushl %esi - pushl %edi /* save registers */ - -@@ -1322,6 +1356,47 @@ copyout_fail: - movl $1,%eax /* return 1 for failure */ - jmp copyout_ret /* pop frame and return */ - -+/* -+ * Copy to user address space - version for copying messages. -+ * arg0: kernel address -+ * arg1: user address -+ * arg2: byte count - must be a multiple of four -+ */ -+ENTRY(copyoutmsg) -+ pushl %esi -+ pushl %edi /* save registers */ -+ -+ movl 8+S_ARG0,%esi /* get kernel start address */ -+ movl 8+S_ARG1,%edi /* get user start address */ -+ movl 8+S_ARG2,%ecx /* get count */ -+ -+ movl $USER_DS,%eax /* use user data segment for accesses */ -+ mov %ax,%es -+ -+#if !defined(MACH_HYP) && !PAE -+ movl 8+S_ARG2,%edx /* copyout_retry expects count here */ -+ cmpl $3,machine_slot+SUB_TYPE_CPU_TYPE -+ jbe copyout_retry /* Use slow version on i386 */ -+#endif /* !defined(MACH_HYP) && !PAE */ -+ -+ shrl $2,%ecx /* move by longwords */ -+ RECOVER(copyoutmsg_fail) -+ rep -+ movsl -+ xorl %eax,%eax /* return 0 for success */ -+ -+copyoutmsg_ret: -+ mov %ss,%di /* restore ES to kernel segment */ -+ mov %di,%es -+ -+ popl %edi /* restore registers */ -+ popl %esi -+ ret /* and return */ -+ -+copyoutmsg_fail: -+ movl $1,%eax /* return 1 for failure */ -+ jmp copyoutmsg_ret /* pop frame and return */ -+ - #if !defined(MACH_HYP) && !PAE - /* - * Check whether user address space is writable --- -2.1.4 - |