patacongo commented on a change in pull request #3626:
URL: https://github.com/apache/incubator-nuttx/pull/3626#discussion_r642649470
##########
File path: arch/arm/src/armv6-m/arm_svcall.c
##########
@@ -298,34 +298,65 @@ int arm_svcall(int irq, FAR void *context, FAR void *arg)
break;
#endif
+#if !defined(CONFIG_BUILD_FLAT) && !defined(CONFIG_DISABLE_PTHREAD)
+
/* R0=SYS_pthread_start: This a user pthread start
*
- * void up_pthread_start(pthread_startroutine_t entrypt,
- * pthread_addr_t arg) noreturn_function;
+ * void up_pthread_start(pthread_trampoline_t startup,
+ * pthread_startroutine_t entrypt, pthread_addr_t arg)
*
* At this point, the following values are saved in context:
*
* R0 = SYS_pthread_start
- * R1 = entrypt
- * R2 = arg
+ * R1 = startup
+ * R2 = entrypt
+ * R3 = arg
*/
-#if defined(CONFIG_BUILD_PROTECTED) && !defined(CONFIG_DISABLE_PTHREAD)
case SYS_pthread_start:
{
/* Set up to return to the user-space pthread start-up function in
* unprivileged mode.
*/
- regs[REG_PC] = (uint32_t)USERSPACE->pthread_startup;
+ regs[REG_PC] = (uint32_t)regs[REG_R1] & ~1; /* startup */
regs[REG_EXC_RETURN] = EXC_RETURN_UNPRIVTHR;
- /* Change the parameter ordering to match the expectation of struct
- * userpace_s pthread_startup:
+ /* Change the parameter ordering to match the expectation of the
+ * user space pthread_startup:
+ */
+
+ regs[REG_R0] = regs[REG_R2]; /* pthread entry */
+ regs[REG_R1] = regs[REG_R3]; /* arg */
+ }
+ break;
+
+ /* R0=SYS_pthread_exit: This pthread_exit call in user-space
+ *
+ * void up_pthread_exit(pthread_exitroutine_t exit,
+ * FAR void *exit_value)
+ *
+ * At this point, the following values are saved in context:
+ *
+ * R0 = SYS_pthread_exit
+ * R1 = pthread_exit trampoline routine
+ * R2 = exit_value
+ */
+
+ case SYS_pthread_exit:
+ {
+ /* Set up to return to the user-space pthread start-up function in
+ * unprivileged mode.
+ */
+
+ regs[REG_PC] = (uint32_t)regs[REG_R1] & ~1; /* startup */
Review comment:
I verified that the code is correct as it is. The PROTECTED build
stm32f4discovery:kostest works correctly as is.
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