From 8c6fc0c15415b32080a848bbde640e104098cf13 Mon Sep 17 00:00:00 2001
From: Carlos Maiolino <cem@maiolino.dev>
Date: Thu, 10 Jul 2025 22:18:39 +0200
Subject: Initial drop

Add some riscv code

Signed-off-by: Carlos Maiolino <cem@toxiclabs.cc>
---
 riscv/riscv-probe/Makefile | 128 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 riscv/riscv-probe/Makefile

(limited to 'riscv/riscv-probe/Makefile')

diff --git a/riscv/riscv-probe/Makefile b/riscv/riscv-probe/Makefile
new file mode 100644
index 0000000..a1fb2fe
--- /dev/null
+++ b/riscv/riscv-probe/Makefile
@@ -0,0 +1,128 @@
+CROSS_COMPILE      ?= riscv64-unknown-elf-
+
+AR                 = $(CROSS_COMPILE)ar
+
+CFLAGS             = -mcmodel=medany -ffunction-sections -fdata-sections
+LDFLAGS            = -nostartfiles -nostdlib -nostdinc -static -lgcc \
+                     -Wl,--nmagic -Wl,--gc-sections
+INCLUDES           = -Ienv/common
+
+libfemto_dirs      = libfemto/std libfemto/drivers libfemto/arch/riscv
+libfemto_src       = $(sort $(foreach d,$(libfemto_dirs),$(wildcard $(d)/*.c)))
+libfemto_asm       = $(sort $(foreach d,$(libfemto_dirs),$(wildcard $(d)/*.s)))
+libfemto_objs      = $(patsubst %.s,%.o,$(libfemto_asm)) \
+                     $(patsubst %.c,%.o,$(libfemto_src))
+
+#
+# Compiler configurations and target environment definitions
+#
+
+subdirs            = examples
+
+libs               = libfemto
+
+configs            = rv32imac rv64imac
+
+CC_rv32imac        = $(CROSS_COMPILE)gcc
+CFLAGS_rv32imac    = -Os -march=rv32imac -mabi=ilp32 -Ienv/common/rv32
+LDFLAGS_rv32imac   =
+
+CC_rv64imac        = $(CROSS_COMPILE)gcc
+CFLAGS_rv64imac    = -Os -march=rv64imac -mabi=lp64  -Ienv/common/rv64
+LDFLAGS_rv64imac   =
+
+targets            = rv32imac:default \
+                     rv64imac:default \
+                     rv32imac:spike \
+                     rv64imac:spike \
+                     rv32imac:virt \
+                     rv64imac:virt \
+                     rv32imac:qemu-sifive_e \
+                     rv64imac:qemu-sifive_e \
+                     rv32imac:qemu-sifive_u \
+                     rv64imac:qemu-sifive_u \
+                     rv32imac:coreip-e2-arty
+
+#
+# make rules
+#
+
+all: all_programs
+
+clean:
+	rm -fr build
+
+backup: clean
+	tar czf ../$(shell basename $(shell pwd)).tar.gz .
+
+#
+# To view commands use: make V=1
+#
+
+ifdef V
+cmd = @mkdir -p $2 ; echo "$3"; $3
+else
+cmd = @echo "$1"; mkdir -p $2 ; $3
+endif
+
+#
+# Build system functions to generate pattern rules for all configs
+#
+
+define pattern =
+build/obj/$(2)/%.o: %.$(3)
+	$(call cmd,$(1).$(2) $$@,$$(@D),$(CC_$(2)) $(CFLAGS_$(2)) $(CFLAGS) \
+	$$(INCLUDES) -c $$^ -o $$@)
+endef
+
+$(foreach c,$(configs),$(eval $(call pattern,CC,$(c),c)))
+$(foreach c,$(configs),$(eval $(call pattern,AS,$(c),s)))
+
+#
+# Build system functions to generate library rules for all configs
+#
+
+define archive =
+build/lib/$(2)/$(3).a: $(addprefix build/obj/$(2)/,$($(3)_objs))
+	$(call cmd,$(1).$(2) $$@,$$(@D),$(AR) cr $$@ $$^)
+LIBS_$(2) += build/lib/$(2)/$(3).a
+endef
+
+define lib =
+$(foreach c,$(configs),$(eval $(call archive,AR,$(c),$(1))))
+INCLUDES += -I$(1)/include
+endef
+
+$(foreach l,$(libs),$(eval $(call lib,$(l))))
+
+#
+# Build system functions to generate build rules for all subdirs
+#
+
+sub_makes := $(foreach dir,$(subdirs),$(wildcard ${dir}/*/rules.mk))
+$(foreach makefile,$(sub_makes),$(eval include $(makefile)))
+sub_dirs := $(foreach m,$(sub_makes),$(m:/rules.mk=))
+module_name = $(lastword $(subst /, ,$(1)))
+module_objs = $(addprefix build/obj/$(3)/,$(addprefix $(2)/,$($(1)_objs)))
+config_arch = $(word 1,$(subst :, ,$(1)))
+config_env = $(word 2,$(subst :, ,$(1)))
+
+define rule =
+build/bin/$(3)/$(4)/$(1): \
+build/obj/$(3)/env/$(4)/crt.o build/obj/$(3)/env/$(4)/setup.o $(2) $$(LIBS_$(3))
+	$$(call cmd,LD.$(3) $$@,$$(@D),$(CC_$(3)) $(CFLAGS_$(3)) $$(CFLAGS) \
+	$$(LDFLAGS_$(3)) $$(LDFLAGS) -T env/$(4)/default.lds $$^ -o $$@)
+endef
+
+define module =
+program_names += $(foreach cfg,$(targets),build/bin/$(call \
+  config_arch,$(cfg))/$(call config_env,$(cfg))/$(1))
+
+$(foreach cfg,$(targets),$(eval $(call rule,$(1),$(call \
+  module_objs,$(1),$(2),$(call config_arch,$(cfg))),$(call \
+  config_arch,$(cfg)),$(call config_env,$(cfg)))))
+endef
+
+$(foreach d,$(sub_dirs),$(eval $(call module,$(call module_name,$(d)),$(d))))
+
+all_programs: $(program_names)
-- 
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