arch/arm: syscall SYS_switch_context and SYS_restore_context use 0 para

reason: simplify context switch sys_call0(SYS_switch_context) sys_call0(SYS_restore_context) Signed-off-by: hujun5 <[email protected]>
apache · Nov 23, 2024 · 62e747f · 62e747f
1 parent 1485ecd
commit 62e747f
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Showing 17 changed files with 94 additions and 377 deletions.
diff --git a/arch/arm/include/irq.h b/arch/arm/include/irq.h
@@ -82,13 +82,13 @@
 #ifndef __ASSEMBLY__
 
 #ifndef up_switch_context
-#define up_switch_context(tcb, rtcb)                              \
-  do {                                                            \
-    if (!up_interrupt_context())                                  \
-      {                                                           \
-        sys_call2(SYS_switch_context, (uintptr_t)&rtcb->xcp.regs, \
-                  (uintptr_t)tcb->xcp.regs);                      \
-      }                                                           \
+#define up_switch_context(tcb, rtcb)   \
+  do {                                 \
+    if (!up_interrupt_context())       \
+      {                                \
+        sys_call0(SYS_switch_context); \
+      }                                \
+      UNUSED(rtcb);                    \
   } while (0)
 #endif
 

diff --git a/arch/arm/src/arm/arm_sigdeliver.c b/arch/arm/src/arm/arm_sigdeliver.c
@@ -54,7 +54,6 @@
 void arm_sigdeliver(void)
 {
   struct tcb_s *rtcb = this_task();
-  uint32_t *regs = rtcb->xcp.saved_regs;
 
   board_autoled_on(LED_SIGNAL);
 
@@ -99,5 +98,6 @@ void arm_sigdeliver(void)
   board_autoled_off(LED_SIGNAL);
 
   g_running_tasks[this_cpu()] = NULL;
-  arm_fullcontextrestore(regs);
+  rtcb->xcp.regs = rtcb->xcp.saved_regs;
+  arm_fullcontextrestore();
 }
diff --git a/arch/arm/src/arm/arm_syscall.c b/arch/arm/src/arm/arm_syscall.c
@@ -81,46 +81,7 @@ uint32_t *arm_syscall(uint32_t *regs)
 
   switch (cmd)
     {
-      /* R0=SYS_restore_context:  Restore task context
-       *
-       * void arm_fullcontextrestore(uint32_t *restoreregs)
-       *   noreturn_function;
-       *
-       * At this point, the following values are saved in context:
-       *
-       *   R0 = SYS_restore_context
-       *   R1 = restoreregs
-       */
-
       case SYS_restore_context:
-        {
-          /* Replace 'regs' with the pointer to the register set in
-           * regs[REG_R1].  On return from the system call, that register
-           * set will determine the restored context.
-           */
-
-          tcb->xcp.regs = (uint32_t *)regs[REG_R1];
-          DEBUGASSERT(up_current_regs());
-        }
-        break;
-
-      /* R0=SYS_switch_context:  This a switch context command:
-       *
-       *   void arm_switchcontext(uint32_t **saveregs,
-       *                          uint32_t *restoreregs);
-       *
-       * At this point, the following values are saved in context:
-       *
-       *   R0 = SYS_switch_context
-       *   R1 = saveregs
-       *   R2 = restoreregs
-       *
-       * In this case, we do both: We save the context registers to the save
-       * register area reference by the saved contents of R1 and then set
-       * regs to the save register area referenced by the saved
-       * contents of R2.
-       */
-
       case SYS_switch_context:
         break;
 

diff --git a/arch/arm/src/armv6-m/arm_sigdeliver.c b/arch/arm/src/armv6-m/arm_sigdeliver.c
@@ -162,5 +162,8 @@ void arm_sigdeliver(void)
   leave_critical_section((uint16_t)regs[REG_PRIMASK]);
   rtcb->irqcount--;
 #endif
-  arm_fullcontextrestore(regs);
+  g_running_tasks[this_cpu()] = NULL;
+  rtcb->xcp.regs = rtcb->xcp.saved_regs;
+  arm_fullcontextrestore();
+  UNUSED(regs);
 }
diff --git a/arch/arm/src/armv6-m/arm_svcall.c b/arch/arm/src/armv6-m/arm_svcall.c
@@ -117,9 +117,8 @@ static void dispatch_syscall(void)
 
 int arm_svcall(int irq, void *context, void *arg)
 {
-  struct tcb_s *tcb = this_task();
   uint32_t *regs = (uint32_t *)context;
-  uint32_t *new_regs = regs;
+  struct tcb_s *tcb;
   uint32_t cmd;
 
   cmd = regs[REG_R0];
@@ -149,51 +148,15 @@ int arm_svcall(int irq, void *context, void *arg)
 
   switch (cmd)
     {
-      /* R0=SYS_restore_context:  This a restore context command:
-       *
-       *   void arm_fullcontextrestore(uint32_t *restoreregs)
-       *     noreturn_function;
-       *
-       * At this point, the following values are saved in context:
-       *
-       *   R0 = SYS_restore_context
-       *   R1 = restoreregs
-       *
-       * In this case, we simply need to set current_regs to restore register
-       * area referenced in the saved R1. context == current_regs is the
-       * normal exception return.  By setting current_regs = context[R1], we
-       * force the return to the saved context referenced in R1.
-       */
-
       case SYS_restore_context:
-        {
-          DEBUGASSERT(regs[REG_R1] != 0);
-          new_regs = (uint32_t *)regs[REG_R1];
-          tcb->xcp.regs = (uint32_t *)regs[REG_R1];
-        }
-        break;
-
-      /* R0=SYS_switch_context:  This a switch context command:
-       *
-       *   void arm_switchcontext(uint32_t **saveregs,
-       *                          uint32_t *restoreregs);
-       *
-       * At this point, the following values are saved in context:
-       *
-       *   R0 = SYS_switch_context
-       *   R1 = saveregs
-       *   R2 = restoreregs
-       *
-       * In this case, we do both: We save the context registers to the save
-       * register area reference by the saved contents of R1 and then set
-       * current_regs to the save register area referenced by the saved
-       * contents of R2.
-       */
-
       case SYS_switch_context:
         {
-          DEBUGASSERT(regs[REG_R1] != 0 && regs[REG_R2] != 0);
-          new_regs = (uint32_t *)regs[REG_R2];
+          tcb = this_task();
+          restore_critical_section(tcb, this_cpu());
+
+#ifdef CONFIG_DEBUG_SYSCALL_INFO
+          regs = tcb->xcp.regs;
+#endif
         }
         break;
 
@@ -447,30 +410,23 @@ int arm_svcall(int irq, void *context, void *arg)
    * switch.
    */
 
-  if (regs != new_regs)
-    {
-      restore_critical_section(tcb, this_cpu());
-
 #ifdef CONFIG_DEBUG_SYSCALL_INFO
-      regs = new_regs;
-
-      svcinfo("SVCall Return:\n");
-      svcinfo("  R0: %08x %08x %08x %08x %08x %08x %08x %08x\n",
-              regs[REG_R0],  regs[REG_R1], regs[REG_R2],  regs[REG_R3],
-              regs[REG_R4],  regs[REG_R5], regs[REG_R6],  regs[REG_R7]);
-      svcinfo("  R8: %08x %08x %08x %08x %08x %08x %08x %08x\n",
-              regs[REG_R8],  regs[REG_R9], regs[REG_R10], regs[REG_R11],
-              regs[REG_R12], regs[REG_R13], regs[REG_R14], regs[REG_R15]);
-      svcinfo(" PSR: %08x EXC_RETURN: %08x CONTROL: %08x\n",
-              regs[REG_XPSR], regs[REG_EXC_RETURN], regs[REG_CONTROL]);
-#endif
-    }
-#ifdef CONFIG_DEBUG_SYSCALL_INFO
-  else
+#  ifndef CONFIG_DEBUG_SVCALL
+  if (cmd > SYS_switch_context)
+#  endif
     {
-      svcinfo("SVCall Return: %d\n", regs[REG_R0]);
+  svcinfo("SVCall Return:\n");
+  svcinfo("  R0: %08x %08x %08x %08x %08x %08x %08x %08x\n",
+          regs[REG_R0],  regs[REG_R1], regs[REG_R2],  regs[REG_R3],
+          regs[REG_R4],  regs[REG_R5], regs[REG_R6],  regs[REG_R7]);
+  svcinfo("  R8: %08x %08x %08x %08x %08x %08x %08x %08x\n",
+          regs[REG_R8],  regs[REG_R9], regs[REG_R10], regs[REG_R11],
+          regs[REG_R12], regs[REG_R13], regs[REG_R14], regs[REG_R15]);
+  svcinfo(" PSR: %08x EXC_RETURN: %08x CONTROL: %08x\n",
+          regs[REG_XPSR], regs[REG_EXC_RETURN], regs[REG_CONTROL]);
     }
 #endif
 
+  UNUSED(tcb);
   return OK;
 }
diff --git a/arch/arm/src/armv7-a/arm_sigdeliver.c b/arch/arm/src/armv7-a/arm_sigdeliver.c
@@ -162,5 +162,7 @@ void arm_sigdeliver(void)
 #endif
 
   g_running_tasks[this_cpu()] = NULL;
-  arm_fullcontextrestore(regs);
+  rtcb->xcp.regs = rtcb->xcp.saved_regs;
+  arm_fullcontextrestore();
+  UNUSED(regs);
 }
diff --git a/arch/arm/src/armv7-a/arm_syscall.c b/arch/arm/src/armv7-a/arm_syscall.c
@@ -257,47 +257,7 @@ uint32_t *arm_syscall(uint32_t *regs)
         }
         break;
 #endif
-
-      /* R0=SYS_restore_context:  Restore task context
-       *
-       * void arm_fullcontextrestore(uint32_t *restoreregs)
-       *   noreturn_function;
-       *
-       * At this point, the following values are saved in context:
-       *
-       *   R0 = SYS_restore_context
-       *   R1 = restoreregs
-       */
-
       case SYS_restore_context:
-        {
-          /* Replace 'regs' with the pointer to the register set in
-           * regs[REG_R1].  On return from the system call, that register
-           * set will determine the restored context.
-           */
-
-          tcb->xcp.regs = (uint32_t *)regs[REG_R1];
-          DEBUGASSERT(up_current_regs());
-        }
-        break;
-
-      /* R0=SYS_switch_context:  This a switch context command:
-       *
-       *   void arm_switchcontext(uint32_t **saveregs,
-       *                          uint32_t *restoreregs);
-       *
-       * At this point, the following values are saved in context:
-       *
-       *   R0 = SYS_switch_context
-       *   R1 = saveregs
-       *   R2 = restoreregs
-       *
-       * In this case, we do both: We save the context registers to the save
-       * register area reference by the saved contents of R1 and then set
-       * regs to the save register area referenced by the saved
-       * contents of R2.
-       */
-
       case SYS_switch_context:
         break;
 

diff --git a/arch/arm/src/armv7-m/arm_sigdeliver.c b/arch/arm/src/armv7-m/arm_sigdeliver.c
@@ -174,5 +174,9 @@ void arm_sigdeliver(void)
 #endif
   rtcb->irqcount--;
 #endif
-  arm_fullcontextrestore(regs);
+
+  g_running_tasks[this_cpu()] = NULL;
+  rtcb->xcp.regs = rtcb->xcp.saved_regs;
+  arm_fullcontextrestore();
+  UNUSED(regs);
 }
diff --git a/arch/arm/src/armv7-m/arm_svcall.c b/arch/arm/src/armv7-m/arm_svcall.c
@@ -125,9 +125,8 @@ static void dispatch_syscall(void)
 
 int arm_svcall(int irq, void *context, void *arg)
 {
-  struct tcb_s *tcb = this_task();
   uint32_t *regs = (uint32_t *)context;
-  uint32_t *new_regs = regs;
+  struct tcb_s *tcb;
   uint32_t cmd;
 
   cmd = regs[REG_R0];
@@ -157,52 +156,15 @@ int arm_svcall(int irq, void *context, void *arg)
 
   switch (cmd)
     {
-      /* R0=SYS_restore_context:  This a restore context command:
-       *
-       *   void arm_fullcontextrestore(uint32_t *restoreregs)
-       *          noreturn_function;
-       *
-       * At this point, the following values are saved in context:
-       *
-       *   R0 = SYS_restore_context
-       *   R1 = restoreregs
-       *
-       * In this case, we simply need to set current_regs to restore
-       * register area referenced in the saved R1. context == current_regs
-       * is the normal exception return.  By setting current_regs =
-       * context[R1], we force the return to the saved context referenced
-       * in R1.
-       */
-
       case SYS_restore_context:
-        {
-          DEBUGASSERT(regs[REG_R1] != 0);
-          new_regs = (uint32_t *)regs[REG_R1];
-          tcb->xcp.regs = (uint32_t *)regs[REG_R1];
-        }
-        break;
-
-      /* R0=SYS_switch_context:  This a switch context command:
-       *
-       *   void arm_switchcontext(uint32_t **saveregs,
-       *                          uint32_t *restoreregs);
-       *
-       * At this point, the following values are saved in context:
-       *
-       *   R0 = SYS_switch_context
-       *   R1 = saveregs
-       *   R2 = restoreregs
-       *
-       * In this case, we do both: We save the context registers to the save
-       * register area reference by the saved contents of R1 and then set
-       * current_regs to the save register area referenced by the saved
-       * contents of R2.
-       */
-
       case SYS_switch_context:
         {
-          DEBUGASSERT(regs[REG_R1] != 0 && regs[REG_R2] != 0);
-          new_regs = (uint32_t *)regs[REG_R2];
+          tcb = this_task();
+          restore_critical_section(tcb, this_cpu());
+
+#ifdef CONFIG_DEBUG_SYSCALL_INFO
+          regs = tcb->xcp.regs;
+#endif
         }
         break;
 
@@ -457,30 +419,23 @@ int arm_svcall(int irq, void *context, void *arg)
    * switch.
    */
 
-  if (regs != new_regs)
-    {
-      restore_critical_section(tcb, this_cpu());
-
-#ifdef CONFIG_DEBUG_SYSCALL_INFO
-      regs = new_regs;
-
-      svcinfo("SVCall Return:\n");
-      svcinfo("  R0: %08x %08x %08x %08x %08x %08x %08x %08x\n",
-              regs[REG_R0],  regs[REG_R1], regs[REG_R2],  regs[REG_R3],
-              regs[REG_R4],  regs[REG_R5], regs[REG_R6],  regs[REG_R7]);
-      svcinfo("  R8: %08x %08x %08x %08x %08x %08x %08x %08x\n",
-              regs[REG_R8],  regs[REG_R9], regs[REG_R10], regs[REG_R11],
-              regs[REG_R12], regs[REG_R13], regs[REG_R14], regs[REG_R15]);
-      svcinfo(" PSR: %08x EXC_RETURN: %08x CONTROL: %08x\n",
-              regs[REG_XPSR], regs[REG_EXC_RETURN], regs[REG_CONTROL]);
-#endif
-    }
 #ifdef CONFIG_DEBUG_SYSCALL_INFO
-  else
+#  ifndef CONFIG_DEBUG_SVCALL
+  if (cmd > SYS_switch_context)
+#  endif
     {
-      svcinfo("SVCall Return: %d\n", regs[REG_R0]);
+  svcinfo("SVCall Return:\n");
+  svcinfo("  R0: %08x %08x %08x %08x %08x %08x %08x %08x\n",
+          regs[REG_R0],  regs[REG_R1], regs[REG_R2],  regs[REG_R3],
+          regs[REG_R4],  regs[REG_R5], regs[REG_R6],  regs[REG_R7]);
+  svcinfo("  R8: %08x %08x %08x %08x %08x %08x %08x %08x\n",
+          regs[REG_R8],  regs[REG_R9], regs[REG_R10], regs[REG_R11],
+          regs[REG_R12], regs[REG_R13], regs[REG_R14], regs[REG_R15]);
+  svcinfo(" PSR: %08x EXC_RETURN: %08x CONTROL: %08x\n",
+          regs[REG_XPSR], regs[REG_EXC_RETURN], regs[REG_CONTROL]);
     }
 #endif
 
+  UNUSED(tcb);
   return OK;
 }
diff --git a/arch/arm/src/armv7-r/arm_sigdeliver.c b/arch/arm/src/armv7-r/arm_sigdeliver.c
@@ -159,5 +159,7 @@ void arm_sigdeliver(void)
 #endif
 
   g_running_tasks[this_cpu()] = NULL;
-  arm_fullcontextrestore(regs);
+  rtcb->xcp.regs = rtcb->xcp.saved_regs;
+  arm_fullcontextrestore();
+  UNUSED(regs);
 }