lib: Add mlibc

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 117 insertions, 0 deletions

diff --git a/lib/mlibc/sysdeps/linux/riscv64/arch-syscall.cpp b/lib/mlibc/sysdeps/linux/riscv64/arch-syscall.cpp
new file mode 100644
index 0000000..18ac6b0
--- /dev/null
+++ b/lib/mlibc/sysdeps/linux/riscv64/arch-syscall.cpp
@@ -0,0 +1,117 @@
+#include <sys/syscall.h>
+#include <bits/syscall.h>
+
+using sc_word_t = __sc_word_t;
+
+sc_word_t __do_syscall0(long sc) {
+	register int sc_reg asm("a7") = sc;
+	register sc_word_t ret asm("a0");
+	asm volatile ("ecall" : "=r"(ret) : "r"(sc_reg) : "memory", "a1");
+	return ret;
+}
+
+sc_word_t __do_syscall1(long sc,
+		sc_word_t arg1) {
+	register int sc_reg asm("a7") = sc;
+	register sc_word_t arg1_reg asm("a0") = arg1;
+	register sc_word_t ret asm("a0");
+	asm volatile ("ecall" : "=r"(ret) :
+			"r"(sc_reg),
+			"r"(arg1_reg)
+			: "memory", "a1");
+	return ret;
+}
+
+sc_word_t __do_syscall2(long sc,
+		sc_word_t arg1, sc_word_t arg2) {
+	register int sc_reg asm("a7") = sc;
+	register sc_word_t arg1_reg asm("a0") = arg1;
+	register sc_word_t arg2_reg asm("a1") = arg2;
+	register sc_word_t ret asm("a0");
+	asm volatile ("ecall" : "=r"(ret) :
+			"r"(sc_reg),
+			"r"(arg1_reg),
+			"r"(arg2_reg)
+			: "memory");
+	return ret;
+}
+
+sc_word_t __do_syscall3(long sc,
+		sc_word_t arg1, sc_word_t arg2, sc_word_t arg3) {
+	register int sc_reg asm("a7") = sc;
+	register sc_word_t arg1_reg asm("a0") = arg1;
+	register sc_word_t arg2_reg asm("a1") = arg2;
+	register sc_word_t arg3_reg asm("a2") = arg3;
+	register sc_word_t ret asm("a0");
+	asm volatile ("ecall" : "=r"(ret) :
+			"r"(sc_reg),
+			"r"(arg1_reg),
+			"r"(arg2_reg),
+			"r"(arg3_reg)
+			: "memory");
+	return ret;
+}
+
+sc_word_t __do_syscall4(long sc,
+		sc_word_t arg1, sc_word_t arg2, sc_word_t arg3,
+		sc_word_t arg4) {
+	register int sc_reg asm("a7") = sc;
+	register sc_word_t arg1_reg asm("a0") = arg1;
+	register sc_word_t arg2_reg asm("a1") = arg2;
+	register sc_word_t arg3_reg asm("a2") = arg3;
+	register sc_word_t arg4_reg asm("a3") = arg4;
+	register sc_word_t ret asm("a0");
+	asm volatile ("ecall" : "=r"(ret) :
+			"r"(sc_reg),
+			"r"(arg1_reg),
+			"r"(arg2_reg),
+			"r"(arg3_reg),
+			"r"(arg4_reg)
+			: "memory");
+	return ret;
+}
+
+sc_word_t __do_syscall5(long sc,
+		sc_word_t arg1, sc_word_t arg2, sc_word_t arg3,
+		sc_word_t arg4, sc_word_t arg5) {
+	register int sc_reg asm("a7") = sc;
+	register sc_word_t arg1_reg asm("a0") = arg1;
+	register sc_word_t arg2_reg asm("a1") = arg2;
+	register sc_word_t arg3_reg asm("a2") = arg3;
+	register sc_word_t arg4_reg asm("a3") = arg4;
+	register sc_word_t arg5_reg asm("a4") = arg5;
+	register sc_word_t ret asm("a0");
+	asm volatile ("ecall" : "=r"(ret) :
+			"r"(sc_reg),
+			"r"(arg1_reg),
+			"r"(arg2_reg),
+			"r"(arg3_reg),
+			"r"(arg4_reg),
+			"r"(arg5_reg)
+			: "memory");
+	return ret;
+}
+
+sc_word_t __do_syscall6(long sc,
+		sc_word_t arg1, sc_word_t arg2, sc_word_t arg3,
+		sc_word_t arg4, sc_word_t arg5, sc_word_t arg6) {
+	register int sc_reg asm("a7") = sc;
+	register sc_word_t arg1_reg asm("a0") = arg1;
+	register sc_word_t arg2_reg asm("a1") = arg2;
+	register sc_word_t arg3_reg asm("a2") = arg3;
+	register sc_word_t arg4_reg asm("a3") = arg4;
+	register sc_word_t arg5_reg asm("a4") = arg5;
+	register sc_word_t arg6_reg asm("a5") = arg6;
+	register sc_word_t ret asm("a0");
+	asm volatile ("ecall" : "=r"(ret) :
+			"r"(sc_reg),
+			"r"(arg1_reg),
+			"r"(arg2_reg),
+			"r"(arg3_reg),
+			"r"(arg4_reg),
+			"r"(arg5_reg),
+			"r"(arg6_reg)
+			: "memory"
+			);
+	return ret;
+}