py/emitinlinerv32: Add inline assembler support for RV32.

This commit adds support for writing inline assembler functions when
targeting a RV32IMC processor.

Given that this takes up a bit of rodata space due to its large
instruction decoding table and its extensive error messages, it is
enabled by default only on offline targets such as mpy-cross and the
qemu port.

Signed-off-by: Alessandro Gatti <a.gatti@frob.it>

1 files changed, 86 insertions, 0 deletions

diff --git a/tests/inlineasm/rv32/asmloadstore.py b/tests/inlineasm/rv32/asmloadstore.py
new file mode 100644
index 000000000..2c49e07b4
--- /dev/null
+++ b/tests/inlineasm/rv32/asmloadstore.py
@@ -0,0 +1,86 @@
+# test load/store opcodes
+
+
+@micropython.asm_rv32
+def l():
+    li(a5, 4)
+    addi(sp, sp, -12)
+    li(a0, 0x123)
+    c_swsp(a0, 0)
+    addi(a1, a0, 0x111)
+    c_swsp(a1, 4)
+    addi(a2, a1, 0x111)
+    c_swsp(a2, 8)
+    mv(a4, sp)
+    c_lw(a3, 0(a4))
+    bne(a3, a0, END)
+    addi(a5, a5, -1)
+    lw(a3, 4(a4))
+    bne(a3, a1, END)
+    addi(a5, a5, -1)
+    lhu(a3, 8(a4))
+    bne(a3, a2, END)
+    addi(a5, a5, -1)
+    lbu(a0, 8(a4))
+    addi(a0, a0, 0x300)
+    bne(a0, a2, END)
+    addi(a5, a5, -1)
+    label(END)
+    addi(sp, sp, 12)
+    mv(a0, a5)
+
+
+print(l())
+
+
+@micropython.asm_rv32
+def s():
+    li(a5, 4)
+    addi(sp, sp, -12)
+    c_swsp(zero, 0)
+    c_swsp(zero, 4)
+    c_swsp(zero, 8)
+    li(a0, 0x12345)
+    mv(a4, sp)
+    c_sw(a0, 0(a4))
+    sh(a0, 4(a4))
+    sb(a0, 8(a4))
+    li(a1, 0xFFFF)
+    and_(a1, a0, a1)
+    andi(a2, a0, 0xFF)
+    lw(a3, 0(sp))
+    bne(a3, a0, END)
+    addi(a5, a5, -1)
+    lw(a3, 4(sp))
+    bne(a3, a1, END)
+    addi(a5, a5, -1)
+    lw(a3, 8(sp))
+    bne(a3, a2, END)
+    addi(a5, a5, -1)
+    label(END)
+    addi(sp, sp, 12)
+    mv(a0, a5)
+
+
+print(s())
+
+
+@micropython.asm_rv32
+def lu():
+    li(a5, 4)
+    addi(sp, sp, -8)
+    li(a0, 0xF1234567)
+    c_swsp(a0, 0)
+    c_swsp(a0, 4)
+    lh(a1, 0(sp))
+    blt(a1, zero, END)
+    addi(a5, a5, -1)
+    lb(a2, 4(sp))
+    blt(a2, zero, END)
+    addi(a5, a5, -1)
+    label(END)
+    addi(sp, sp, 8)
+    mv(a0, a5)
+
+
+print(lu())