diff options
| author | Damien George <damien.p.george@gmail.com> | 2018-08-16 13:43:36 +1000 |
|---|---|---|
| committer | Damien George <damien.p.george@gmail.com> | 2018-08-16 13:43:36 +1000 |
| commit | f7d6108d1ad83f26598e73d3b163f3de411c902b (patch) | |
| tree | 3f94696c223b168f081b74527575d10497ef6e3c | |
| parent | 8c49995398a970f173a218de43d43b66d48157d5 (diff) | |
py/asmxtensa: Handle function entry/exit when stack use larger than 127.
| -rw-r--r-- | py/asmxtensa.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/py/asmxtensa.c b/py/asmxtensa.c index 00448dfc5..bec7f36db 100644 --- a/py/asmxtensa.c +++ b/py/asmxtensa.c @@ -69,7 +69,12 @@ void asm_xtensa_entry(asm_xtensa_t *as, int num_locals) { // adjust the stack-pointer to store a0, a12, a13, a14 and locals, 16-byte aligned as->stack_adjust = (((4 + num_locals) * WORD_SIZE) + 15) & ~15; - asm_xtensa_op_addi(as, ASM_XTENSA_REG_A1, ASM_XTENSA_REG_A1, -as->stack_adjust); + if (SIGNED_FIT8(-as->stack_adjust)) { + asm_xtensa_op_addi(as, ASM_XTENSA_REG_A1, ASM_XTENSA_REG_A1, -as->stack_adjust); + } else { + asm_xtensa_op_movi(as, ASM_XTENSA_REG_A9, as->stack_adjust); + asm_xtensa_op_sub(as, ASM_XTENSA_REG_A1, ASM_XTENSA_REG_A1, ASM_XTENSA_REG_A9); + } // save return value (a0) and callee-save registers (a12, a13, a14) asm_xtensa_op_s32i_n(as, ASM_XTENSA_REG_A0, ASM_XTENSA_REG_A1, 0); @@ -86,7 +91,13 @@ void asm_xtensa_exit(asm_xtensa_t *as) { asm_xtensa_op_l32i_n(as, ASM_XTENSA_REG_A0, ASM_XTENSA_REG_A1, 0); // restore stack-pointer and return - asm_xtensa_op_addi(as, ASM_XTENSA_REG_A1, ASM_XTENSA_REG_A1, as->stack_adjust); + if (SIGNED_FIT8(as->stack_adjust)) { + asm_xtensa_op_addi(as, ASM_XTENSA_REG_A1, ASM_XTENSA_REG_A1, as->stack_adjust); + } else { + asm_xtensa_op_movi(as, ASM_XTENSA_REG_A9, as->stack_adjust); + asm_xtensa_op_add(as, ASM_XTENSA_REG_A1, ASM_XTENSA_REG_A1, ASM_XTENSA_REG_A9); + } + asm_xtensa_op_ret_n(as); } |