py/asmarm: Add asm_arm_ldrh_reg_reg_offset() helper func.

Signed-off-by: Damien George <damien@micropython.org>

2 files changed, 6 insertions, 0 deletions

diff --git a/py/asmarm.c b/py/asmarm.c
index 4ba93d080..42724e4d4 100644
--- a/py/asmarm.c
+++ b/py/asmarm.c
@@ -304,6 +304,11 @@ void asm_arm_ldrh_reg_reg(asm_arm_t *as, uint rd, uint rn) {
     emit_al(as, 0x1d000b0 | (rn << 16) | (rd << 12));
 }
 
+void asm_arm_ldrh_reg_reg_offset(asm_arm_t *as, uint rd, uint rn, uint byte_offset) {
+    // ldrh rd, [rn, #off]
+    emit_al(as, 0x1f000b0 | (rn << 16) | (rd << 12) | ((byte_offset & 0xf0) << 4) | (byte_offset & 0xf));
+}
+
 void asm_arm_ldrb_reg_reg(asm_arm_t *as, uint rd, uint rn) {
     // ldrb rd, [rn]
     emit_al(as, 0x5d00000 | (rn << 16) | (rd << 12));
diff --git a/py/asmarm.h b/py/asmarm.h
index 0e029f20e..272684bc6 100644
--- a/py/asmarm.h
+++ b/py/asmarm.h
@@ -109,6 +109,7 @@ void asm_arm_asr_reg_reg(asm_arm_t *as, uint rd, uint rs);
 // memory
 void asm_arm_ldr_reg_reg(asm_arm_t *as, uint rd, uint rn, uint byte_offset);
 void asm_arm_ldrh_reg_reg(asm_arm_t *as, uint rd, uint rn);
+void asm_arm_ldrh_reg_reg_offset(asm_arm_t *as, uint rd, uint rn, uint byte_offset);
 void asm_arm_ldrb_reg_reg(asm_arm_t *as, uint rd, uint rn);
 void asm_arm_str_reg_reg(asm_arm_t *as, uint rd, uint rm, uint byte_offset);
 void asm_arm_strh_reg_reg(asm_arm_t *as, uint rd, uint rm);