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-rw-r--r--src/process.c109
1 files changed, 32 insertions, 77 deletions
diff --git a/src/process.c b/src/process.c
index 3a674c1..e1dfae5 100644
--- a/src/process.c
+++ b/src/process.c
@@ -256,9 +256,9 @@ static uint32 get_new_proc_from_queue(uint32 queue_lock)
}
}
-static void proc_create(uint32 address, uint32 size, uint32 queue_lock,
- boolean allocate)
-{
+static void proc_create(
+ uint32 address, uint32 size, uint32 queue_lock, boolean allocate
+) {
/*
* Give birth to a new process! We must specify the address and size of the
* new organism.
@@ -709,9 +709,8 @@ static boolean addr_seek(uint32 pidx, boolean forward)
return FALSE;
}
-static boolean get_register_pointers(
- uint32 pidx, uint32_p *regs, uint32 reg_count
-) {
+static void get_register_pointers(uint32 pidx, uint32_p *regs, uint32 reg_count)
+{
/*
* This function is used to get pointers to a calling organism registers.
* Specifically, registers returned are those that will be used when
@@ -726,9 +725,18 @@ static boolean get_register_pointers(
assert(reg_count < 4);
/*
+ * Set all modifiers to the default register (rax). This increases
+ * robustness making instructions valid even when not enough modifiers are
+ * found.
+ */
+ for (ridx = 0; ridx < reg_count; ridx++) {
+ regs[ridx] = &g_procs[pidx].rax;
+ }
+
+ /*
* Iterate 'reg_count' number of instructions forward from the IP, noting
* down all found register modifiers. If less than 'reg_count' modifiers are
- * found, this function returns FALSE (triggering a 'fault').
+ * found, organism will use the default register (rax).
*/
for (ridx = 0; ridx < reg_count; ridx++) {
uint32 mod_addr = g_procs[pidx].ip + 1 + ridx;
@@ -737,7 +745,7 @@ static boolean get_register_pointers(
!sal_mem_is_address_valid(mod_addr) ||
!sal_is_mod(sal_mem_get_inst(mod_addr))
) {
- return FALSE;
+ break;
}
switch (sal_mem_get_inst(mod_addr)) {
@@ -755,8 +763,6 @@ static boolean get_register_pointers(
break;
}
}
-
- return TRUE;
}
static void addr(uint32 pidx)
@@ -787,12 +793,7 @@ static void addr(uint32 pidx)
/*
* Store address of complement into the given register.
*/
- if (!get_register_pointers(pidx, &reg, 1)) {
- on_fault(pidx);
- increment_ip(pidx);
- return;
- }
-
+ get_register_pointers(pidx, &reg, 1);
*reg = g_procs[pidx].sp;
increment_ip(pidx);
}
@@ -827,16 +828,11 @@ static void alloc(uint32 pidx, boolean forward)
assert(!sal_proc_is_free(pidx));
/*
- * For this function to work, we need at least two register modifiers.
- * Then, we check for all possible error conditions. If any error conditions
- * are found, the instruction faults and returns.
+ * Get two register modifiers. Then, we check for all possible error
+ * conditions. If any error conditions are found, the instruction faults and
+ * returns.
*/
- if (!get_register_pointers(pidx, regs, 2)) {
- on_fault(pidx);
- increment_ip(pidx);
- return;
- }
-
+ get_register_pointers(pidx, regs, 2);
block_size = *regs[0];
/*
@@ -960,12 +956,7 @@ static void one_reg_op(uint32 pidx, uint8 inst)
assert(pidx < g_capacity);
assert(!sal_proc_is_free(pidx));
assert(sal_is_inst(inst));
-
- if (!get_register_pointers(pidx, &reg, 1)) {
- on_fault(pidx);
- increment_ip(pidx);
- return;
- }
+ get_register_pointers(pidx, &reg, 1);
switch (inst) {
case INCN:
@@ -1007,12 +998,7 @@ static void if_not_zero(uint32 pidx)
assert(g_is_init);
assert(pidx < g_capacity);
assert(!sal_proc_is_free(pidx));
-
- if (!get_register_pointers(pidx, &reg, 1)) {
- on_fault(pidx);
- increment_ip(pidx);
- return;
- }
+ get_register_pointers(pidx, &reg, 1);
if (!(*reg)) {
increment_ip(pidx);
@@ -1033,12 +1019,7 @@ static void three_reg_op(uint32 pidx, uint8 inst)
assert(pidx < g_capacity);
assert(!sal_proc_is_free(pidx));
assert(sal_is_inst(inst));
-
- if (!get_register_pointers(pidx, regs, 3)) {
- on_fault(pidx);
- increment_ip(pidx);
- return;
- }
+ get_register_pointers(pidx, regs, 3);
switch (inst) {
case SUMN:
@@ -1079,11 +1060,9 @@ static void load(uint32 pidx)
assert(g_is_init);
assert(pidx < g_capacity);
assert(!sal_proc_is_free(pidx));
+ get_register_pointers(pidx, regs, 2);
- if (
- !get_register_pointers(pidx, regs, 2) ||
- !sal_mem_is_address_valid(*regs[0])
- ) {
+ if (!sal_mem_is_address_valid(*regs[0])) {
on_fault(pidx);
increment_ip(pidx);
return;
@@ -1135,11 +1114,9 @@ static void write(uint32 pidx)
assert(g_is_init);
assert(pidx < g_capacity);
assert(!sal_proc_is_free(pidx));
+ get_register_pointers(pidx, regs, 2);
- if (
- !get_register_pointers(pidx, regs, 2) ||
- !sal_mem_is_address_valid(*regs[0]) || !sal_is_inst(*regs[1])
- ) {
+ if (!sal_mem_is_address_valid(*regs[0]) || !sal_is_inst(*regs[1])) {
on_fault(pidx);
increment_ip(pidx);
return;
@@ -1167,12 +1144,7 @@ static void send(uint32 pidx)
assert(g_is_init);
assert(pidx < g_capacity);
assert(!sal_proc_is_free(pidx));
-
- if (!get_register_pointers(pidx, &reg, 1)) {
- on_fault(pidx);
- increment_ip(pidx);
- return;
- }
+ get_register_pointers(pidx, &reg, 1);
if (!sal_is_inst(*reg)) {
on_fault(pidx);
@@ -1195,13 +1167,7 @@ static void receive(uint32 pidx)
assert(g_is_init);
assert(pidx < g_capacity);
assert(!sal_proc_is_free(pidx));
-
- if (!get_register_pointers(pidx, &reg, 1)) {
- on_fault(pidx);
- increment_ip(pidx);
- return;
- }
-
+ get_register_pointers(pidx, &reg, 1);
*reg = _sal_comm_receive();
assert(sal_is_inst(*reg));
increment_ip(pidx);
@@ -1218,12 +1184,7 @@ static void push(uint32 pidx)
assert(g_is_init);
assert(pidx < g_capacity);
assert(!sal_proc_is_free(pidx));
-
- if (!get_register_pointers(pidx, &reg, 1)) {
- on_fault(pidx);
- increment_ip(pidx);
- return;
- }
+ get_register_pointers(pidx, &reg, 1);
for (sidx = 7; sidx; sidx--) {
g_procs[pidx].stack[sidx] = g_procs[pidx].stack[sidx - 1];
@@ -1243,13 +1204,7 @@ static void pop(uint32 pidx)
assert(g_is_init);
assert(pidx < g_capacity);
assert(!sal_proc_is_free(pidx));
-
- if (!get_register_pointers(pidx, &reg, 1)) {
- on_fault(pidx);
- increment_ip(pidx);
- return;
- }
-
+ get_register_pointers(pidx, &reg, 1);
*reg = g_procs[pidx].stack[0];
for (sidx = 1; sidx < 8; sidx++) {