wait for trapframe

kernel/console.d

-kernel/console.o: kernel/console.c \
- /opt/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.2/lib/gcc/loongarch64-linux-gnu/8.3.0/include/stdarg.h \
- kernel/include/console.h kernel/include/param.h kernel/include/proc.h \
- kernel/include/param.h kernel/include/loongarch.h \
- /opt/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.2/lib/gcc/loongarch64-linux-gnu/8.3.0/include/larchintrin.h \
- kernel/include/types.h kernel/include/spinlock.h \
- kernel/include/context.h kernel/include/loongarch.h \
- kernel/include/spinlock.h kernel/include/types.h kernel/include/uart.h \
- kernel/include/memlayout.h kernel/include/proc.h

kernel/intr.d

-kernel/intr.o: kernel/intr.c kernel/include/intr.h \
- kernel/include/loongarch.h \
- /opt/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.2/lib/gcc/loongarch64-linux-gnu/8.3.0/include/larchintrin.h \
- kernel/include/types.h kernel/include/printf.h kernel/include/proc.h \
- kernel/include/param.h kernel/include/loongarch.h \
- kernel/include/spinlock.h kernel/include/context.h kernel/include/proc.h \
- kernel/include/types.h

kernel/kalloc.d

-kernel/kalloc.o: kernel/kalloc.c kernel/include/kalloc.h \
- kernel/include/types.h kernel/include/memlayout.h kernel/include/param.h \
- kernel/include/printf.h kernel/include/proc.h kernel/include/param.h \
- kernel/include/loongarch.h \
- /opt/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.2/lib/gcc/loongarch64-linux-gnu/8.3.0/include/larchintrin.h \
- kernel/include/spinlock.h kernel/include/context.h \
- kernel/include/loongarch.h kernel/include/spinlock.h \
- kernel/include/string.h kernel/include/types.h

kernel/main.d

-kernel/main.o: kernel/main.c kernel/include/loongarch.h \
- /opt/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.2/lib/gcc/loongarch64-linux-gnu/8.3.0/include/larchintrin.h \
- kernel/include/types.h kernel/include/loongarchregs.h \
- kernel/include/console.h kernel/include/kalloc.h \
- kernel/include/memlayout.h kernel/include/param.h \
- kernel/include/printf.h kernel/include/proc.h kernel/include/param.h \
- kernel/include/loongarch.h kernel/include/spinlock.h \
- kernel/include/context.h kernel/include/proc.h kernel/include/vm.h \
- kernel/include/uart.h kernel/include/memlayout.h

kernel/printf.d

-kernel/printf.o: kernel/printf.c \
- /opt/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.2/lib/gcc/loongarch64-linux-gnu/8.3.0/include/stdarg.h \
- kernel/include/console.h kernel/include/param.h kernel/include/printf.h \
- kernel/include/proc.h kernel/include/param.h kernel/include/loongarch.h \
- /opt/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.2/lib/gcc/loongarch64-linux-gnu/8.3.0/include/larchintrin.h \
- kernel/include/types.h kernel/include/spinlock.h \
- kernel/include/context.h kernel/include/proc.h \
- kernel/include/loongarch.h kernel/include/spinlock.h \
- kernel/include/string.h kernel/include/types.h

kernel/proc.d

-kernel/proc.o: kernel/proc.c kernel/include/proc.h kernel/include/param.h \
- kernel/include/loongarch.h \
- /opt/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.2/lib/gcc/loongarch64-linux-gnu/8.3.0/include/larchintrin.h \
- kernel/include/types.h kernel/include/spinlock.h \
- kernel/include/context.h kernel/include/intr.h kernel/include/param.h \
- kernel/include/printf.h kernel/include/proc.h kernel/include/spinlock.h \
- kernel/include/string.h kernel/include/types.h

kernel/spinlock.d

-kernel/spinlock.o: kernel/spinlock.c kernel/include/spinlock.h \
- kernel/include/types.h kernel/include/intr.h kernel/include/printf.h \
- kernel/include/proc.h kernel/include/param.h kernel/include/loongarch.h \
- /opt/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.2/lib/gcc/loongarch64-linux-gnu/8.3.0/include/larchintrin.h \
- kernel/include/spinlock.h kernel/include/context.h

kernel/string.d

-kernel/string.o: kernel/string.c kernel/include/types.h

kernel/trampoline.S

@@ -5,11 +5,144 @@
         # (TRAMPOLINE) in user and kernel space so that
         # it continues to work when it switches page tables.
 	#
-	# kernel.ld causes this to be aligned
+	# kernel.ld.d causes this to be aligned
         # to a page boundary.
         #
-    .section trampsec
+	.section trampsec
 .globl trampoline
 trampoline:
 .align 4
-// 只是尝试编译
\ No newline at end of file
+.globl uservec
+uservec:    
+	#
+        # trap.c sets stvec to point here, so
+        # traps from user space start here,
+        # in supervisor mode, but with a
+        # user page table.
+        #
+        # sscratch points to where the process's p->trapframe is
+        # mapped into user space, at TRAPFRAME.
+        #
+        
+	# swap a0 and sscratch
+        # so that a0 is TRAPFRAME
+        # 交换a0 和 sscratch的位置，交换用户空间和内核空间
+        csrrw a0, sscratch, a0
+
+        # save the user registers in TRAPFRAME
+        st.d ra, 40(a0)
+        st.d sp, 48(a0)
+        st.d gp, 56(a0)
+        st.d tp, 64(a0)
+        st.d t0, 72(a0)
+        st.d t1, 80(a0)
+        st.d t2, 88(a0)
+        st.d s0, 96(a0)
+        st.d s1, 104(a0)
+        st.d a1, 120(a0)
+        st.d a2, 128(a0)
+        st.d a3, 136(a0)
+        st.d a4, 144(a0)
+        st.d a5, 152(a0)
+        st.d a6, 160(a0)
+        st.d a7, 168(a0)
+        st.d s2, 176(a0)
+        st.d s3, 184(a0)
+        st.d s4, 192(a0)
+        st.d s5, 200(a0)
+        st.d s6, 208(a0)
+        st.d s7, 216(a0)
+        st.d s8, 224(a0)
+        st.d s9, 232(a0)
+        st.d s10, 240(a0)
+        st.d s11, 248(a0)
+        st.d t3, 256(a0)
+        st.d t4, 264(a0)
+        st.d t5, 272(a0)
+        st.d t6, 280(a0)
+
+	# save the user a0 in p->trapframe->a0
+        csrr t0, sscratch
+        st.d t0, 112(a0)
+
+        # restore kernel stack pointer from p->trapframe->kernel_sp
+        ld.d sp, 8(a0)
+
+        # make tp hold.d the current hartid, from p->trapframe->kernel_hartid
+        ld.d tp, 32(a0)
+
+        # load the address of usertrap(), p->trapframe->kernel_trap
+        ld.d t0, 16(a0)
+
+        # restore kernel page table from p->trapframe->kernel_satp
+        ld.d t1, 0(a0)
+        csrw satp, t1
+
+        # sfence.vma zero, zero
+        sfence.vma
+
+        # a0 is no longer valid, since the kernel page
+        # table does not specially map p->tf.
+
+        # jump to usertrap(), which does not return
+        jr t0
+
+.globl userret
+userret:
+        # userret(TRAPFRAME, pagetable)
+        # switch from kernel to user.
+        # usertrapret() calls here.
+        # a0: TRAPFRAME, in user page table.
+        # a1: user page table, for satp.
+
+        # switch to the user page table.
+
+
+        csrw satp, a1
+
+        # sfence.vma zero, zero
+        sfence.vma
+        
+        # put the saved user a0 in sscratch, so we
+        # can swap it with our a0 (TRAPFRAME) in the last step.
+        ld.d t0, 112(a0)
+        csrw sscratch, t0
+
+        # restore all but a0 from TRAPFRAME
+        ld.d ra, 40(a0)
+        ld.d sp, 48(a0)
+        ld.d gp, 56(a0)
+        ld.d tp, 64(a0)
+        ld.d t0, 72(a0)
+        ld.d t1, 80(a0)
+        ld.d t2, 88(a0)
+        ld.d s0, 96(a0)
+        ld.d s1, 104(a0)
+        ld.d a1, 120(a0)
+        ld.d a2, 128(a0)
+        ld.d a3, 136(a0)
+        ld.d a4, 144(a0)
+        ld.d a5, 152(a0)
+        ld.d a6, 160(a0)
+        ld.d a7, 168(a0)
+        ld.d s2, 176(a0)
+        ld.d s3, 184(a0)
+        ld.d s4, 192(a0)
+        ld.d s5, 200(a0)
+        ld.d s6, 208(a0)
+        ld.d s7, 216(a0)
+        ld.d s8, 224(a0)
+        ld.d s9, 232(a0)
+        ld.d s10, 240(a0)
+        ld.d s11, 248(a0)
+        ld.d t3, 256(a0)
+        ld.d t4, 264(a0)
+        ld.d t5, 272(a0)
+        ld.d t6, 280(a0)
+
+	# restore user a0, and save TRAPFRAME in sscratch
+        csrrw a0, sscratch, a0
+
+        # return to user mode and user pc.
+        # usertrapret() set up sstatus and sepc.
+        sret