[03/39] target/hexagon: Implement iassign{r,w} helpers

Commit Message

Brian Cain March 1, 2025, 5:28 a.m. UTC

From: Brian Cain <[e-mail]>

iassign{r,w} are the "Interrupt to thread assignment {read,write}"
instructions.

Signed-off-by: Brian Cain <[e-mail]>
---
 target/hexagon/op_helper.c | 48 ++++++++++++++++++++++++++++++++++++--
 1 file changed, 46 insertions(+), 2 deletions(-)

Patch

diff --git a/target/hexagon/op_helper.c b/target/hexagon/op_helper.c
index fed5cc2715..ded6c80d62 100644
--- a/target/hexagon/op_helper.c
+++ b/target/hexagon/op_helper.c
@@ -1394,12 +1394,56 @@  void HELPER(cswi)(CPUHexagonState *env, uint32_t mask)
 
 void HELPER(iassignw)(CPUHexagonState *env, uint32_t src)
 {
-    g_assert_not_reached();
+    uint32_t modectl;
+    uint32_t thread_enabled_mask;
+    CPUState *cpu;
+
+    BQL_LOCK_GUARD();
+    modectl = arch_get_system_reg(env, HEX_SREG_MODECTL);
+    thread_enabled_mask = GET_FIELD(MODECTL_E, modectl);
+
+    CPU_FOREACH(cpu) {
+        CPUHexagonState *thread_env = &(HEXAGON_CPU(cpu)->env);
+        uint32_t thread_id_mask = 0x1 << thread_env->threadId;
+        if (thread_enabled_mask & thread_id_mask) {
+            uint32_t imask = arch_get_system_reg(thread_env, HEX_SREG_IMASK);
+            uint32_t intbitpos = (src >> 16) & 0xF;
+            uint32_t val = (src >> thread_env->threadId) & 0x1;
+            imask = deposit32(imask, intbitpos, 1, val);
+            arch_set_system_reg(thread_env, HEX_SREG_IMASK, imask);
+
+            qemu_log_mask(CPU_LOG_INT, "%s: thread " TARGET_FMT_ld
+               ", new imask 0x%" PRIx32 "\n", __func__,
+               thread_env->threadId, imask);
+        }
+    }
+    hex_interrupt_update(env);
 }
 
 uint32_t HELPER(iassignr)(CPUHexagonState *env, uint32_t src)
 {
-    g_assert_not_reached();
+    uint32_t modectl;
+    uint32_t thread_enabled_mask;
+    uint32_t intbitpos;
+    uint32_t dest_reg;
+    CPUState *cpu;
+
+    BQL_LOCK_GUARD();
+    modectl = arch_get_system_reg(env, HEX_SREG_MODECTL);
+    thread_enabled_mask = GET_FIELD(MODECTL_E, modectl);
+    /* src fields are in same position as modectl, but mean different things */
+    intbitpos = GET_FIELD(MODECTL_W, src);
+    dest_reg = 0;
+    CPU_FOREACH(cpu) {
+        CPUHexagonState *thread_env = &(HEXAGON_CPU(cpu)->env);
+        uint32_t thread_id_mask = 0x1 << thread_env->threadId;
+        if (thread_enabled_mask & thread_id_mask) {
+            uint32_t imask = arch_get_system_reg(thread_env, HEX_SREG_IMASK);
+            dest_reg |= ((imask >> intbitpos) & 0x1) << thread_env->threadId;
+        }
+    }
+
+    return dest_reg;
 }
 
 void HELPER(start)(CPUHexagonState *env, uint32_t imask)