Changeset a218709 in mainline for kernel/arch/sparc32/src/userspace.c

Timestamp:

2013-12-02T23:45:45Z (10 years ago)

Author:

Jakub Klama <jakub.klama@…>

Branches:

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

Children:

2955bb9

Parents:

3bc42bd

Message:

Implement new userspace window trap mechanism, which utilizes MMU probe
to choose between slow (preemptive, involving inserting stack page mapping)
and fast (direct) handlers.

File:

• kernel/arch/sparc32/src/userspace.c (modified) (1 diff)

kernel/arch/sparc32/src/userspace.c

@@ -42 +42 @@
 void userspace(uspace_arg_t *kernel_uarg)
 {
-        printf("userspace(): entry=%p, stack=%p, stacksize=%d\n", kernel_uarg->uspace_entry, kernel_uarg->uspace_stack, kernel_uarg->uspace_stack_size);
+//      printf("userspace(): entry=%p, stack=%p, stacksize=%d\n", kernel_uarg->uspace_entry, kernel_uarg->uspace_stack, kernel_uarg->uspace_stack_size);
         /* On real hardware this switches the CPU to user
            space mode and jumps to kernel_uarg->uspace_entry. */
 
+        uint32_t l0, l1, l2;
         uint32_t psr = psr_read();
+        uint8_t wim;
 
         psr &= ~(1 << 7);
         psr &= ~(1 << 6);
 
+        /* Read invalid window variables */
+        read_from_invalid(&l0, &l1, &l2);
+
+        /* Make current window invalid */
+        wim = (psr & 0x7) + 1;
+        wim = (1 << wim) | (1 >> (8 - wim));
+
         asm volatile (
                 "flush\n"
                 "mov %[stack], %%sp\n"
-                "mov %[arg], %%o1\n"
+                "mov %[wim], %%wim\n"
+                "ld %[v0], %%o0\n"
+                "ld %[v1], %%o1\n"
+                "ld %[v2], %%o2\n"
+                "call write_to_invalid\n"
+                "nop\n"
+                "ld %[arg], %%o1\n"
                 "jmp %[entry]\n"
                 "mov %[psr], %%psr\n" :: [entry] "r" (kernel_uarg->uspace_entry),
-                           [arg] "r" (kernel_uarg->uspace_uarg),
+                           [arg] "m" (kernel_uarg->uspace_uarg),
                            [psr] "r" (psr),
-                           [stack] "r" (kernel_uarg->uspace_stack + kernel_uarg->uspace_stack_size));
+                           [wim] "r" ((uint32_t)wim),   
+                           [v0] "m" (l0),
+                           [v1] "m" (l1),
+                           [v2] "m" (l2),
+                           [stack] "r" (kernel_uarg->uspace_stack + kernel_uarg->uspace_stack_size - 64) : "%g3", "%g4");
 
         while (true);