Merge pull request #1188 from avdgrinten/managarm-riscv

sysdeps/managarm: make RISC-V compile and link

sysdeps/managarm/generic/file.cpp

@@ -2560,6 +2560,8 @@ int sys_uname(struct utsname *buf) {
 	strcpy(buf->machine, "x86_64");
 #elif defined (__aarch64__)
 	strcpy(buf->machine, "aarch64");
+#elif defined (__riscv)
+	strcpy(buf->machine, "riscv64");
 #else
 #	error Unknown architecture
 #endif

sysdeps/managarm/meson.build

@@ -71,6 +71,9 @@ elif host_machine.cpu_family() == 'x86_64'
 		'x86_64/thread.cpp'
 	)
 elif host_machine.cpu_family() == 'riscv64'
+	libc_sources += files(
+		'riscv64/thread.cpp',
+	)
 else
 	error('Unknown architecture')
 endif
@@ -129,7 +132,7 @@ endif
 
 if not headers_only
 	crtstuff = ['crt0']
-	if host_machine.cpu_family() in ['x86_64', 'aarch64']
+	if host_machine.cpu_family() in ['x86_64', 'aarch64', 'riscv64']
 		crtstuff += [
 			'Scrt1',
 			'crti',

sysdeps/managarm/riscv64/crt-src/Scrt1.S

@@ -0,0 +1,18 @@
+.section .text
+.global _start
+_start:
+	.weak __global_pointer$
+	.hidden __global_pointer$
+	.option push
+	.option norelax
+	lla gp, __global_pointer$
+	.option pop
+
+	mv a0, sp
+	la a1, main
+	call __mlibc_entry@plt
+	unimp
+
+
+.section .note.GNU-stack,"",%progbits
+

sysdeps/managarm/riscv64/crt-src/crt0.S

@@ -0,0 +1,15 @@
+.section .text
+.global _start
+_start:
+	.weak __global_pointer$
+	.hidden __global_pointer$
+	.option push
+	.option norelax
+	lla gp, __global_pointer$
+	.option pop
+
+	mv a0, sp
+	la a1, main
+	call __mlibc_entry
+.section .note.GNU-stack,"",%progbits
+

sysdeps/managarm/riscv64/crt-src/crti.S

@@ -0,0 +1,11 @@
+.section .init
+.global _init
+_init:
+	unimp
+
+.section .fini
+.global _fini
+_fini:
+	unimp
+.section .note.GNU-stack,"",%progbits
+

sysdeps/managarm/riscv64/crt-src/crtn.S

@@ -0,0 +1,7 @@
+.section .init
+	unimp
+
+.section .fini
+	unimp
+.section .note.GNU-stack,"",%progbits
+

sysdeps/managarm/riscv64/thread.cpp

@@ -0,0 +1,9 @@
+#include <bits/ensure.h>
+
+extern "C" void __mlibc_start_thread() {
+	__ensure(!"unimplemented");
+}
+
+extern "C" void __mlibc_signal_restore() {
+	__ensure(!"unimplemented");
+}