diff options
Diffstat (limited to 'debian/patches/sysenter0007-document.patch')
| -rw-r--r-- | debian/patches/sysenter0007-document.patch | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/debian/patches/sysenter0007-document.patch b/debian/patches/sysenter0007-document.patch new file mode 100644 index 0000000..71f7d6e --- /dev/null +++ b/debian/patches/sysenter0007-document.patch @@ -0,0 +1,65 @@ +From d2ca2ffb15f04aab7210757d7c7dabb33ab720d0 Mon Sep 17 00:00:00 2001 +From: Justus Winter <4winter@informatik.uni-hamburg.de> +Date: Tue, 5 May 2015 20:04:15 +0200 +Subject: [PATCH gnumach 07/10] document + +--- + i386/i386/locore.S | 27 +++++++++++++++++---------- + 1 file changed, 17 insertions(+), 10 deletions(-) + +diff --git a/i386/i386/locore.S b/i386/i386/locore.S +index 99fbfb6..4c2a253 100644 +--- a/i386/i386/locore.S ++++ b/i386/i386/locore.S +@@ -1184,6 +1184,18 @@ syscall_addr: + /* set error code - read user space */ + jmp _take_trap /* treat as a trap */ + ++/* ++ * SYSENTER-based system calls. ++ * ++ * Calling convention: ++ * %eax - syscall number ++ * %ebx - syscall argument 1 ++ * %ecx - syscall argument 2 ++ * %edx - syscall argument 3 ++ * %esi - syscall argument 4 ++ * %edi - userspace return address ++ * %ebp - userspace stack pointer ++ */ + + /* User stub for calling the kernel using the sysenter instruction. */ + .globl user_sysenter_stub_start +@@ -1191,9 +1203,9 @@ user_sysenter_stub_start: + push %ebp + mov %esp, %ebp + pushf +- push %ebx ++ push %ebx /* Store callee-saved registers. */ + push %esi +- push %edi /* xxxmore callee-saved registers? */ ++ push %edi + mov 8(%ebp), %eax /* Move syscall number into %eax. */ + mov 12(%ebp), %ebx /* Move first argument into %ebx. */ + mov 16(%ebp), %ecx /* Move second argument into %ecx. */ +@@ -1216,14 +1228,9 @@ user_sysenter_stub_end: + /* + * SYSENTER entry point. + * +- * Calling convention: +- * %eax - syscall number +- * %ebx - syscall argument 1 +- * %ecx - syscall argument 2 +- * %edx - syscall argument 3 +- * %esi - syscall argument 4 +- * %edi - userspace return address +- * %ebp - userspace stack pointer ++ * Control enters at `sysenter_entry' with %esp pointing to the ++ * per-cpu sysenter stack. We store all arguments here. We keep %ebp ++ * pointing to the top of this structure to copy the arguments. + * + * sysenter stack layout: + * +-- +2.1.4 + |