From 3acb10122050d710845a7c35e84423cc1aae5632 Mon Sep 17 00:00:00 2001
From: cheapie <cheapiephp@gmail.com>
Date: Tue, 23 Jun 2026 18:54:53 -0500
Subject: Add Zicfilp extension and some CSR improvements

---
 assembly/landingpad-test/Makefile            |  24 +++++++++++++
 assembly/landingpad-test/landingpad-test.S   |  52 +++++++++++++++++++++++++++
 assembly/landingpad-test/landingpad-test.elf | Bin 0 -> 5788 bytes
 assembly/landingpad-test/landingpad-test.hex |  20 +++++++++++
 assembly/landingpad-test/landingpad-test.o   | Bin 0 -> 1992 bytes
 assembly/landingpad-test/rvcontroller.ld     |   1 +
 6 files changed, 97 insertions(+)
 create mode 100644 assembly/landingpad-test/Makefile
 create mode 100644 assembly/landingpad-test/landingpad-test.S
 create mode 100755 assembly/landingpad-test/landingpad-test.elf
 create mode 100644 assembly/landingpad-test/landingpad-test.hex
 create mode 100644 assembly/landingpad-test/landingpad-test.o
 create mode 120000 assembly/landingpad-test/rvcontroller.ld

(limited to 'assembly')

diff --git a/assembly/landingpad-test/Makefile b/assembly/landingpad-test/Makefile
new file mode 100644
index 0000000..139d2c3
--- /dev/null
+++ b/assembly/landingpad-test/Makefile
@@ -0,0 +1,24 @@
+MARCH ?= rv32imacbzicntr_zicond_zicsr_zifencei_zihintpause_zilsd_zclsd_zabha_zacas_zawrs_zbkb_zbkx_zcb_zcmp_zcmt_zicfilp
+
+.PHONY: all dump load clean
+
+all: landingpad-test.hex
+
+landingpad-test.o: landingpad-test.S
+	riscv32-none-elf-as -I../rvcontroller-libraries -march=${MARCH} -o landingpad-test.o landingpad-test.S
+
+landingpad-test.elf:  landingpad-test.o
+	riscv32-none-elf-ld -T rvcontroller.ld --no-warn-rwx-segments -o landingpad-test.elf landingpad-test.o
+
+dump: landingpad-test.elf
+	riscv32-none-elf-objdump -d landingpad-test.elf
+
+landingpad-test.hex: landingpad-test.elf
+	riscv32-none-elf-objcopy -O ihex landingpad-test.elf landingpad-test.hex
+
+load: landingpad-test.hex
+	bash -c "wl-copy < landingpad-test.hex"
+
+clean:
+	rm -f landingpad-test.hex landingpad-test.elf landingpad-test.o
+
diff --git a/assembly/landingpad-test/landingpad-test.S b/assembly/landingpad-test/landingpad-test.S
new file mode 100644
index 0000000..21c1712
--- /dev/null
+++ b/assembly/landingpad-test/landingpad-test.S
@@ -0,0 +1,52 @@
+li t0,0x400
+csrw mseccfg,t0 # Turn on MLPE (enable Zicfilp)
+
+li t0,1
+csrw 0x800,t0 # Enable lightweight mode (will make each pause 1s long)
+
+li a7,4
+la a0,test1msg
+ecall # Display test 1 explanation
+
+pause
+pause
+
+la s0,test1jump
+jalr zero,s0,0 # This jump lands on a landing pad
+
+.word 0 # Invalid instruction just to make sure the jump really happened
+
+test1jump:
+lpad 0
+li a7,4
+la a0,test1done
+ecall # Tell user we got here
+
+pause
+pause
+
+li a7,4
+la a0,test2msg
+ecall # Display test 2 explanation
+
+pause
+pause
+
+la s0,test2jump
+jalr zero,s0,0 # This jump doesn't land on a landing pad
+
+.word 0 # Another invalid instruction to jump over
+
+test2jump:
+# No landing pad! This should crash
+li a7,4
+la a0,test2done
+ecall # Tell user we got here (we shouldn't have!)
+
+li a7,10
+ecall
+
+test1msg: .asciz "Testing OK jump\nThis should work\n\n\n\n"
+test1done: .asciz "OK jump jumped\nThis is expected\n\n\n\n"
+test2msg: .asciz "Testing bad jump\nThis should crash\n\n\n\n"
+test2done: .asciz "Bad jump jumped!\nThis shouldn't\nhappen\n\n\n"
diff --git a/assembly/landingpad-test/landingpad-test.elf b/assembly/landingpad-test/landingpad-test.elf
new file mode 100755
index 0000000..b08c3a0
Binary files /dev/null and b/assembly/landingpad-test/landingpad-test.elf differ
diff --git a/assembly/landingpad-test/landingpad-test.hex b/assembly/landingpad-test/landingpad-test.hex
new file mode 100644
index 0000000..4d8d8c5
--- /dev/null
+++ b/assembly/landingpad-test/landingpad-test.hex
@@ -0,0 +1,20 @@
+:10000000930200407390727485427390028091480D
+:100010001705000013058507730000000F0000019D
+:100020000F0000011704000013040401670004001E
+:10003000000000001700000091481705000013059C
+:100040003507730000000F0000010F000001914808
+:100050001705000013051508730000000F000001CC
+:100060000F000001170400001304040167000400DE
+:1000700000000000914817050000130525087300D3
+:100080000000A9487300000054657374696E67200E
+:100090004F4B206A756D700A546869732073686FDE
+:1000A000756C6420776F726B0A0A0A0A004F4B2046
+:1000B0006A756D70206A756D7065640A546869733D
+:1000C0002069732065787065637465640A0A0A0A9A
+:1000D0000054657374696E6720626164206A756D8F
+:1000E000700A546869732073686F756C642063725A
+:1000F0006173680A0A0A0A00426164206A756D70B9
+:10010000206A756D706564210A546869732073688C
+:100110006F756C646E27740A68617070656E0A0A88
+:020120000A00D3
+:00000001FF
diff --git a/assembly/landingpad-test/landingpad-test.o b/assembly/landingpad-test/landingpad-test.o
new file mode 100644
index 0000000..3534749
Binary files /dev/null and b/assembly/landingpad-test/landingpad-test.o differ
diff --git a/assembly/landingpad-test/rvcontroller.ld b/assembly/landingpad-test/rvcontroller.ld
new file mode 120000
index 0000000..bc01402
--- /dev/null
+++ b/assembly/landingpad-test/rvcontroller.ld
@@ -0,0 +1 @@
+../../rvcontroller.ld
\ No newline at end of file
-- 
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