arch/at91sam3x8e: finalize entry routine

arch/at91sam3x8e/entry.c

@@ -15,12 +15,10 @@ void arch_enter(void *sp)
 {
 	struct reg_snapshot *regs = sp;
 	enum syscall sc_num = arch_syscall_num(regs);
-	int (*handler)(sysarg_t arg1, sysarg_t arg2, sysarg_t arg3, sysarg_t arg4);
+	int (*handler)(sysarg_t arg1, sysarg_t arg2, sysarg_t arg3,
+		       sysarg_t arg4, sysarg_t arg5, sysarg_t arg6);
 	int sc_ret;
 
-	if (sc_num == SYSCALL_WRITE)
-		*(uint32_t *)0x400E1030U = 1 << 27;
-
 	if (sc_num > NSYSCALLS) {
 		arch_syscall_set_rval(regs, -EINVAL);
 		return;
@@ -33,8 +31,8 @@ void arch_enter(void *sp)
 	}
 
 	/* TODO: not every syscall uses the max amount of parameters (duh) */
-	sc_ret = handler(arch_syscall_arg1(regs), arch_syscall_arg2(regs),
-			 arch_syscall_arg3(regs), arch_syscall_arg4(regs));
+	sc_ret = handler(arch_syscall_arg1(regs), arch_syscall_arg2(regs), arch_syscall_arg3(regs),
+			 arch_syscall_arg4(regs), arch_syscall_arg5(regs), arch_syscall_arg6(regs));
 
 	arch_syscall_set_rval(regs, sc_ret);
 }

arch/at91sam3x8e/irq_svc.S

@@ -17,14 +17,14 @@ irq_svc:
 	/*
 	 * Syscalls on Cortex-M use the following parameter calling convention:
 	 *
+	 * number: r7
+	 * rval: r0
 	 * arg1: r0
 	 * arg2: r1
 	 * arg3: r2
 	 * arg4: r3
-	 * rval: r0
-	 *
-	 * The syscall number is passed as part of the SVC instruction and read
-	 * from the program counter in arch_syscall().
+	 * arg5: r4
+	 * arg6: r5
 	 */
 
 	/*

arch/at91sam3x8e/syscall.S

@@ -10,10 +10,50 @@
 .thumb_func
 .global syscall
 .type syscall, %function
-/* int syscall(int number, int arg1, int arg2, int arg3, int arg4); */
+/* int syscall(int number, int arg1, int arg2, int arg3, int arg4, int arg5, int arg6); */
 syscall:
-	svc	#1
+	push	{r4-r5,r7}
+
+	/*
+	 * I HAVE NO IDEA WHY THE  F U C K  GCC THINKS I CAN'T MOV TWO LOW REGS
+	 * IN ONE INSTRUCTION WHEN THAT IS  L I T E R A L L Y  IN THE ASM OUTPUT
+	 * OF GCC WHEN COMPILING SOME C CODE.  BUT AT THIS POINT, I WON'T EVEN
+	 * BOTHER WITH WHATEVER SHITTY COMPILE OPTION OR PREPROCESSOR DIRECTIVE
+	 * I HAVE TO TURN ON IN ORDER FOR THIS PIECE OF SHIT THAT DARES CALLING
+	 * ITSELF A COMPILER EAT MY SHIT CODE AND SHITS OUT THE SHITTY BINARY
+	 * I WANT.  FUCK YOU, SYSCALLS WILL JUST TAKE 10 INSTRUCTIONS MORE THEN.
+	 */
+
+	mov	r3,	r12
+	push	{r3}
+
+	mov	r12,	r0		/* syscall number */
+	mov	r7,	r12
+
+	mov	r12,	r1		/* arg1 */
+	mov	r0,	r12
+
+	mov	r12,	r2		/* arg2 */
+	mov	r1,	r12
+
+	mov	r12,	r3		/* arg3 */
+	mov	r2,	r12
+
+	pop	{r3}
+	mov	r12,	r3
+
+	/* stack params begin at 12 bytes offset because we already pushed three registers */
+	ldr	r3,	[sp, #12]	/* arg4 */
+	ldr	r4,	[sp, #16]	/* arg5 */
+	ldr	r5,	[sp, #20]	/* arg6 */
+
+	svc	#0
+
+	pop	{r4-r5,r7}
+
+	/* r0 (return value) is set by the kernel */
 	bx	lr
+
 .size syscall, .-syscall
 
 /*

include/arch/at91sam3x8e/hardware.h

@@ -54,11 +54,13 @@ struct reg_snapshot {
 	struct reg_hw_snapshot hw;
 };
 
-#define arch_syscall_num(reg_snap) ((reg_snap)->hw.r0)
-#define arch_syscall_arg1(reg_snap) ((reg_snap)->hw.r1)
-#define arch_syscall_arg2(reg_snap) ((reg_snap)->hw.r2)
-#define arch_syscall_arg3(reg_snap) ((reg_snap)->hw.r3)
-#define arch_syscall_arg4(reg_snap) ((reg_snap)->hw.r12)
+#define arch_syscall_num(reg_snap) ((reg_snap)->sw.r7)
+#define arch_syscall_arg1(reg_snap) ((reg_snap)->hw.r0)
+#define arch_syscall_arg2(reg_snap) ((reg_snap)->hw.r1)
+#define arch_syscall_arg3(reg_snap) ((reg_snap)->hw.r2)
+#define arch_syscall_arg4(reg_snap) ((reg_snap)->hw.r3)
+#define arch_syscall_arg5(reg_snap) ((reg_snap)->sw.r4)
+#define arch_syscall_arg6(reg_snap) ((reg_snap)->sw.r5)
 
 #define arch_syscall_set_rval(reg_snap, val) ((reg_snap)->hw.r0 = (val));
 

include/ardix/syscall.h

@@ -17,11 +17,12 @@ enum syscall {
 };
 
 /** Perform an indirect system call. */
-int syscall(enum syscall number, sysarg_t arg1, sysarg_t arg2, sysarg_t arg3, sysarg_t arg4);
+int syscall(enum syscall number, sysarg_t arg1, sysarg_t arg2, sysarg_t arg3,
+	    sysarg_t arg4, sysarg_t arg5, sysarg_t arg6);
 
 /** The table of system call handlers, indexed by syscall number. */
-extern const int (*sys_table[NSYSCALLS])(sysarg_t arg1, sysarg_t arg2,
-					 sysarg_t arg3, sysarg_t arg4);
+extern const int (*sys_table[NSYSCALLS])(sysarg_t arg1, sysarg_t arg2, sysarg_t arg3,
+					 sysarg_t arg4, sysarg_t arg5, sysarg_t arg6);
 
 /* catchall handler that returns -ENOSYS */
 int sys_stub(void);

kernel/syscall.c

@@ -6,10 +6,11 @@
 #include <toolchain.h>
 
 #define sys_table_entry(number, func) \
-	[number] (int (*)(sysarg_t, sysarg_t, sysarg_t, sysarg_t))(func)
+	[number] (int (*)(sysarg_t, sysarg_t, sysarg_t, sysarg_t, sysarg_t, sysarg_t))(func)
 
 __rodata
-const int (*sys_table[NSYSCALLS])(sysarg_t arg1, sysarg_t arg2, sysarg_t arg3, sysarg_t arg4) = {
+const int (*sys_table[NSYSCALLS])(sysarg_t arg1, sysarg_t arg2, sysarg_t arg3,
+				  sysarg_t arg4, sysarg_t arg5, sysarg_t arg6) = {
 	sys_table_entry(SYSCALL_READ, &sys_stub),
 	sys_table_entry(SYSCALL_WRITE, &sys_write),
 };

lib/unistd.c

@@ -11,13 +11,12 @@
 __shared ssize_t pwrite(int fildes, const void *buf, size_t nbyte, off_t offset)
 {
 	return syscall(SYSCALL_WRITE, (sysarg_t)fildes, (sysarg_t)buf, (sysarg_t)nbyte,
-		       (sysarg_t)offset);
+		       (sysarg_t)offset, 0, 0);
 }
 
 __shared ssize_t write(int fildes, const void *buf, size_t nbyte)
 {
-	return syscall(SYSCALL_WRITE, (sysarg_t)fildes, (sysarg_t)buf, (sysarg_t)nbyte,
-		       (sysarg_t)0);
+	return syscall(SYSCALL_WRITE, (sysarg_t)fildes, (sysarg_t)buf, (sysarg_t)nbyte, 0, 0, 0);
 }
 
 /*