Changeset 1b109cb in mainline for arch/mips32/src/exception.c

Timestamp:

2006-03-20T13:39:56Z (19 years ago)

Author:

Ondrej Palkovsky <ondrap@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

9d3e185

Parents:

8d25b44

Message:

Cleanup of mips

• inline register reads
• better fpu disable/enable - global settings is automatically propagated to task
• fast syscall

File:

• arch/mips32/src/exception.c (modified) (1 diff)

arch/mips32/src/exception.c

@@ -130 +130 @@
 }
 
-#include <debug.h>
+__native syscall_handler(__native a0, __native a1, __native a2,
+                         __native a3, __native sysnum)
+{
+        if (sysnum < SYSCALL_END)
+                return syscall_table[sysnum](a0,a1,a2,a3);
+        panic("Undefined syscall %d", sysnum);
+}
+
 /** Handle syscall userspace call */
 static void syscall_exception(int n, istate_t *istate)
 {
-        interrupts_enable();
-        if (istate->t0 < SYSCALL_END)
-                istate->v0 = syscall_table[istate->t0](istate->a0,
-                                                       istate->a1,
-                                                       istate->a2,
-                                                       istate->a3);
-        else
-                panic("Undefined syscall %d", istate->a3);
-        istate->epc += 4;
-        interrupts_disable();
-}
-
-void exception(istate_t *istate)
-{
-        int cause;
-        int excno;
-
-        ASSERT(CPU != NULL);
-
-        /*
-         * NOTE ON OPERATION ORDERING
-         *
-         * On entry, interrupts_disable() must be called before 
-         * exception bit is cleared.
-         */
-
-        interrupts_disable();
-        cp0_status_write(cp0_status_read() & ~ (cp0_status_exl_exception_bit |
-                                                cp0_status_um_bit));
-
-        /* Save istate so that the threads can access it */
-        /* If THREAD->istate is set, this is nested exception,
-         * do not rewrite it
-         */
-        if (THREAD && !THREAD->istate)
-                THREAD->istate = istate;
-
-        cause = cp0_cause_read();
-        excno = cp0_cause_excno(cause);
-        /* Dispatch exception */
-        exc_dispatch(excno, istate);
-
-        /* Set to NULL, so that we can still support nested
-         * exceptions
-         * TODO: We should probably set EXL bit before this command,
-         * nesting. On the other hand, if some exception occurs between
-         * here and ERET, it won't set anything on the istate anyway.
-         */
-        if (THREAD)
-                THREAD->istate = NULL;
+        panic("Syscall is handled through shortcut");
 }