save all registers on syscalls

1 files changed, 13 insertions, 0 deletions

diff --git a/src/kernel/arch/i386/registers.h b/src/kernel/arch/i386/registers.h
new file mode 100644
index 0000000..feba157
--- /dev/null
+++ b/src/kernel/arch/i386/registers.h
@@ -0,0 +1,13 @@
+#pragma once
+#include <stdint.h>
+
+struct registers {
+	uint32_t eax, ebx, ecx, edx, esi, edi;
+	void *ebp, *esp, *eip;
+};
+
+// saves a return value according to the SysV ABI
+inline void regs_savereturn(struct registers *regs, uint64_t value) {
+	regs->eax = value;
+	regs->edx = value >> 32;
+}