initial commit

misc/riscv/main.typ

@@ -0,0 +1,39 @@
+#import "riscv.typ"
+
+#set page(width: auto, height: auto, margin: 1cm)
+
+#riscv.explain-instruction-encoding("lui x0, 0x12")
+
+#riscv.explain-instruction-encoding("add sp, a0, a1")
+
+#pagebreak()
+
+#riscv.riscv-to-bin(```
+0x00000300 main:   jal ra, simple # call
+0x00000304         add s0, s1, s1
+0x0000051c simple: jalr x0, ra, 0 # return
+```)
+
+#pagebreak()
+
+#riscv.riscv-to-bin(```
+f1:
+  addi sp, sp, -20 # make space on stack for 5 words
+  sw a0, 16(sp)
+  sw a1, 12(sp)
+  sw ra, 8(sp)     # save ra on stack
+  sw s4, 4(sp)
+  sw s5, 0(sp)
+  jal ra, f2
+  lw ra, 8(sp)     # restore ra (and other regs) from stack
+  addi sp, sp, 20  # deallocate stack space
+  jalr zero, ra, 0
+
+# f2 (leaf-function) only uses s4 and calls no functions
+f2:
+  addi sp, sp, -4  # make space on stack for 1 word
+  sw s4, 0(sp)
+  lw s4, 0(sp)
+  addi sp, sp, 4   # deallocate stack space
+  jalr zero, ra, 0
+```)