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

LM32: Correct some assembly language interrupt handling issues. Now the basic port seems functional.

Browse Source
This commit is contained in:
Ramtin Amin 2016-11-07 06:54:57 -06:00 committed by Gregory Nutt
parent 89c3c20052
commit fe2b755791
1 changed files with 46 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

59
arch/misoc/src/lm32/lm32_vectors.S
View File

@ -38,13 +38,43 @@
* Included Files * Included Files
****************************************************************************/ ****************************************************************************/
#include <nuttx/config.h>
#include <arch/irq.h> #include <arch/irq.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Linker memory organization ***********************************************/
/* Data memory is organized as follows:
*
* 1) Initialized data (.data):
* Start: _sdata
* End(+1): _edata
* 2) Uninitialized data (.bss):
* Start: _sbss
* End(+1): _ebss
*
* The following are placed outside of the "normal" memory segments -- mostly
* so that they do not have to be cleared on power up.
*
* 3) Idle thread stack:
* Start: _ebss
* End(+1): _ebss+CONFIG_IDLETHREAD_STACKSIZE
* 4) Heap:
* Start: _ebss+CONFIG_IDLETHREAD_STACKSIZE
* End(+1): to the end of memory
*/
#define LM32_STACK_BASE _ebss
#define LM32_STACK_TOP _ebss+CONFIG_IDLETHREAD_STACKSIZE
#define LM32_HEAP_BASE LM32_STACK_TOP
/**************************************************************************** /****************************************************************************
* Exception handlers - Must be 32 bytes long. * Exception handlers - Must be 32 bytes long.
****************************************************************************/ ****************************************************************************/
.section .text, "ax", @progbits .section .text, "ax", @progbits
.global g_idle_topstack
.global __start .global __start
__start: __start:
@ -131,24 +161,24 @@ _syscall_handler:
_do_reset: _do_reset:
/* Setup stack and global pointer */ /* Setup stack and global pointer */
mvhi sp, hi(_fstack) mvhi sp, hi(LM32_STACK_TOP)
ori sp, sp, lo(_fstack) ori sp, sp, lo(LM32_STACK_TOP)
/* Clear BSS */ /* Clear BSS */
mvhi r1, hi(_sbss) mvhi r1, hi(_sbss)
ori r1, r1, lo(_sbss) ori r1, r1, lo(_sbss)
mvhi r3, hi(_ebss) mvhi r3, hi(_ebss)
ori r3, r3, lo(_ebss) ori r3, r3, lo(_ebss)
.clearBSS: .clearBSS:
be r1, r3, .callMain be r1, r3, .callMain
sw (r1+0), r0 sw (r1+0), r0
addi r1, r1, 4 addi r1, r1, 4
bi .clearBSS bi .clearBSS
.callMain: .callMain:
bi os_start bi os_start
.save_all: .save_all:
addi sp, sp, -136 addi sp, sp, -136
@ -181,7 +211,11 @@ _do_reset:
sw (sp+REG_GP), r26 sw (sp+REG_GP), r26
sw (sp+REG_FP), r27 sw (sp+REG_FP), r27
sw (sp+REG_SP), r28
/* Save SP before we add 136 */
addi r1, sp, 136
sw (sp+REG_SP), r1
/* reg RA done later */ /* reg RA done later */
@ -239,7 +273,7 @@ _do_reset:
lw r1, (r1+REG_INT_CTX) lw r1, (r1+REG_INT_CTX)
wcsr IE, r1 wcsr IE, r1
lw r1, (r1+REG_X1) lw r1, (r1+REG_X1)
addi sp, sp, 136
eret eret
/* This global variable is unsigned long g_idle_topstack and is /* This global variable is unsigned long g_idle_topstack and is
@ -249,10 +283,9 @@ _do_reset:
.data .data
.align 4 .align 4
.globl g_idle_topstack
.type g_idle_topstack, object .type g_idle_topstack, object
g_idle_topstack: g_idle_topstack:
.long _ebss+CONFIG_IDLETHREAD_STACKSIZE .long _LM32_STACK_TOP
.size g_idle_topstack, .-g_idle_topstack .size g_idle_topstack, .-g_idle_topstack
.end .end