vbl

arch/context.asm

@@ -7,12 +7,26 @@
 ; and populates the registers from the the next context.
 align 16
 context_switch:
+    mov  [rsi +  0],  rbx
+    mov  [rsi +  8],  rbp
+    mov  [rsi + 16],  r12
+    mov  [rsi + 24],  r13
+    mov  [rsi + 32],  r14
+    mov  [rsi + 40],  r15
+    mov  [rsi + 48],  rsp
 
 ; context_launch populates the register set from the next context structure.
 ; It does not save the current registers.
 align 16 ; When only one parameter is used for `align`, it will use NOP
 context_launch:
-
+    mov  rbx, [rdi +  0] 
+    mov  rbp, [rdi +  8] 
+    mov  r12, [rdi + 16] 
+    mov  r13, [rdi + 24] 
+    mov  r14, [rdi + 32] 
+    mov  r15, [rdi + 40] 
+    mov  rsp, [rdi + 48] 
+    ret
 ; fake_systemv_abi is used to populate the volatile argument registers used by the systemv abi (rdi, rsi, ...)
 ; with values from the non-volatile registers saved within the thread context (r15, r14, ...)
 align 16

arch/context.cc

@@ -1,9 +1,20 @@
 #include "context.h"
+#include "../debug/output.h"
+
+void panic(){
+    DBG << "panic!\n" << flush;
+    while(1);
+}
 
 void prepareContext(void* tos, Context& context, void (*kickoff)(void*),
                     void* param1) {
-  (void)tos;
-  (void)context;
-  (void)kickoff;
-  (void)param1;
+    ((uint64_t*)tos)[0] = (uint64_t)panic;
+    ((uint64_t*)tos)[-1] = (uint64_t)kickoff;
+    context.rsp = tos;
+    context.rbx = 0;
+    context.rbp = 0;
+    context.r12 = 0;
+    context.r13 = 0;
+    context.r14 = 0;
+    context.r15 = (uint64_t)param1;
 }