sergiotarxz/nuttx
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Fix an compilation error recently introduced into stm32_vectors.S

Browse Source 
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5780 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2013-03-23 23:06:51 +00:00
parent 82b86f9c4a
commit 0b6910fe7c
2 changed files with 19 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
TODO
View File

@ -10,7 +10,7 @@ nuttx/
(1) Memory Managment (mm/)
(3) Signals (sched/, arch/)
(2) pthreads (sched/)
(5) Kernel Build
(6) Kernel Build
(2) C++ Support
(6) Binary loaders (binfmt/)
(16) Network (net/, drivers/net)
@ -425,6 +425,18 @@ o Kernel Build
Priority: Low-Medium. Right now, I do not know if these syscalls are a
real performance issue or not.
Title: ARMv6/7-M SYSCALL PERFORMANCE IMPROVEMENT
Description: Currently the code issues an SVCall to go from user- to kernel-mode
and another go return to user-mode. The second is unnecessary:
If there were a stub in user-space that just set the unprivileged
mode in the CONTROL register and returned, then the dispatch_syscall()
function could just jump to the stub instead of using second SVCall.
Hmmm... would this expose a security whole by executing in user-space
with privileges? That already happens when the userspace memory
allocators are called.
Status: Open
Priority: Low (unless performance becomes an issue).
o C++ Support
^^^^^^^^^^^

10
arch/arm/src/stm32/stm32_vectors.S
View File

@ -52,8 +52,6 @@
* arch/arm/src/armv7-m/up_vectors.S)
*/
#ifndef CONFIG_ARMV7M_CMNVECTOR
/************************************************************************************
* Preprocessor Definitions
************************************************************************************/
@ -77,12 +75,16 @@
* Global Symbols
************************************************************************************/
.globl __start
.syntax unified
.thumb
.file "stm32_vectors.S"
/* Check if common ARMv7 interrupt vectoring is used (see arch/arm/src/armv7-m/up_vectors.S) */
#ifndef CONFIG_ARMV7M_CMNVECTOR
globl __start
/************************************************************************************
* Macros
************************************************************************************/