rust: find json file using CARGO_TRIPLE

artiq/firmware/bootloader/Makefile

@@ -11,7 +11,7 @@ all:: bootloader.bin
 $(RUSTOUT)/libbootloader.a:
 	$(cargo) --target-dir ./cargo \
 	--manifest-path $(BOOTLOADER_DIRECTORY)/Cargo.toml \
-	--target $(BOOTLOADER_DIRECTORY)/../riscv32ima-unknown-none-elf.json
+	--target $(BOOTLOADER_DIRECTORY)/../$(CARGO_TRIPLE).json
 
 bootloader.elf: $(RUSTOUT)/libbootloader.a
 	$(link) -T $(BOOTLOADER_DIRECTORY)/bootloader.ld

artiq/firmware/ksupport/Makefile

@@ -22,7 +22,7 @@ all:: ksupport.elf
 $(RUSTOUT)/libksupport.a:
 	$(cargo) --target-dir ./cargo \
 	--manifest-path $(KSUPPORT_DIRECTORY)/Cargo.toml \
-	--target $(KSUPPORT_DIRECTORY)/../riscv32ima-unknown-none-elf.json
+	--target $(KSUPPORT_DIRECTORY)/../$(CARGO_TRIPLE).json
 
 ksupport.elf: $(RUSTOUT)/libksupport.a glue.o
 	$(link) -T $(KSUPPORT_DIRECTORY)/ksupport.ld \

artiq/firmware/riscv32g-unknown-none-elf.json

@@ -0,0 +1,40 @@
+{
+  "arch": "riscv32",
+  "code-model": "medium",
+  "cpu": "generic-rv32",
+  "crt-static-respected": true,
+  "data-layout": "e-m:e-p:32:32-i64:64-n32-S128",
+  "dynamic-linking": true,
+  "executables": true,
+  "features": "+m,+a,+f,+d",
+  "has-elf-tls": true,
+  "has-rpath": true,
+  "llvm-abiname": "ilp32d",
+  "llvm-target": "riscv32-unknown-linux",
+  "max-atomic-width": 32,
+  "position-independent-executables": true,
+  "pre-link-args": {
+    "gcc": [
+      "-Wl,--as-needed",
+      "-Wl,-z,noexecstack"
+    ]
+  },
+  "relro-level": "full",
+  "target-family": "unix",
+  "target-pointer-width": "32",
+  "unsupported-abis": [
+    "cdecl",
+    "stdcall",
+    "fastcall",
+    "vectorcall",
+    "thiscall",
+    "aapcs",
+    "win64",
+    "sysv64",
+    "ptx-kernel",
+    "msp430-interrupt",
+    "x86-interrupt",
+    "amdgpu-kernel"
+  ]
+}
+  

artiq/firmware/riscv32ima-unknown-none-elf.json

@@ -28,5 +28,4 @@
     "x86-interrupt",
     "amdgpu-kernel"
   ]
-  }
-  
+}

artiq/firmware/runtime/Makefile

@@ -18,7 +18,7 @@ all:: runtime.bin runtime.fbi
 $(RUSTOUT)/libruntime.a:
 	$(cargo) --target-dir ./cargo \
 	--manifest-path $(RUNTIME_DIRECTORY)/Cargo.toml \
-	--target $(RUNTIME_DIRECTORY)/../riscv32ima-unknown-none-elf.json
+	--target $(RUNTIME_DIRECTORY)/../$(CARGO_TRIPLE).json
 
 runtime.elf: $(RUSTOUT)/libruntime.a ksupport_data.o
 	$(link) -T $(RUNTIME_DIRECTORY)/runtime.ld \

artiq/firmware/satman/Makefile

@@ -13,7 +13,7 @@ all:: satman.bin satman.fbi
 $(RUSTOUT)/libsatman.a:
 	$(cargo) --target-dir ./cargo \
 	--manifest-path $(SATMAN_DIRECTORY)/Cargo.toml \
-	--target $(SATMAN_DIRECTORY)/../riscv32ima-unknown-none-elf.json
+	--target $(SATMAN_DIRECTORY)/../$(CARGO_TRIPLE).json
 
 satman.elf: $(RUSTOUT)/libsatman.a
 	$(link) -T $(SATMAN_DIRECTORY)/satman.ld