save all registers on syscalls

1 files changed, 27 insertions, 0 deletions

diff --git a/src/kernel/arch/i386/sysenter.c b/src/kernel/arch/i386/sysenter.c
new file mode 100644
index 0000000..91dac2e
--- /dev/null
+++ b/src/kernel/arch/i386/sysenter.c
@@ -0,0 +1,27 @@
+#include <kernel/arch/generic.h>
+#include <kernel/proc.h>
+
+void sysenter_stage2(int edi, int esi, void *ebp, void *esp,
+                     int ebx, int edx, int   ecx, int   eax)
+{
+	uint64_t val;
+	process_current->regs = (struct registers) {
+		// EAX and EDX will get overriden with the return value later on
+
+		.eax = eax,
+		.ecx = ecx,
+		.edx = edx,
+		.ebx = ebx,
+		.esi = esi,
+		.edi = edi,
+
+		.esp = (void*) ecx, // not a typo, part of my calling convention
+		.eip = (void*) edx, // ^
+		.ebp = ebp,
+	};
+
+	val = syscall_handler(eax, ebx, esi, edi);
+	regs_savereturn(&process_current->regs, val);
+
+	process_switch(process_current); // TODO process_resume
+}