diff options
Diffstat (limited to 'tcg/aarch64/tcg-target.c')
| -rw-r--r-- | tcg/aarch64/tcg-target.c | 100 |
1 files changed, 33 insertions, 67 deletions
diff --git a/tcg/aarch64/tcg-target.c b/tcg/aarch64/tcg-target.c index e36909e11c..5cffe50665 100644 --- a/tcg/aarch64/tcg-target.c +++ b/tcg/aarch64/tcg-target.c @@ -284,6 +284,10 @@ typedef enum { I3207_BLR = 0xd63f0000, I3207_RET = 0xd65f0000, + /* Load/store register pair instructions. */ + I3314_LDP = 0x28400000, + I3314_STP = 0x28000000, + /* Add/subtract immediate instructions. */ I3401_ADDI = 0x11000000, I3401_ADDSI = 0x31000000, @@ -457,6 +461,20 @@ static void tcg_out_insn_3207(TCGContext *s, AArch64Insn insn, TCGReg rn) tcg_out32(s, insn | rn << 5); } +static void tcg_out_insn_3314(TCGContext *s, AArch64Insn insn, + TCGReg r1, TCGReg r2, TCGReg rn, + tcg_target_long ofs, bool pre, bool w) +{ + insn |= 1u << 31; /* ext */ + insn |= pre << 24; + insn |= w << 23; + + assert(ofs >= -0x200 && ofs < 0x200 && (ofs & 7) == 0); + insn |= (ofs & (0x7f << 3)) << (15 - 3); + + tcg_out32(s, insn | r2 << 10 | rn << 5 | r1); +} + static void tcg_out_insn_3401(TCGContext *s, AArch64Insn insn, TCGType ext, TCGReg rd, TCGReg rn, uint64_t aimm) { @@ -1292,56 +1310,6 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, int opc) static uint8_t *tb_ret_addr; -/* callee stack use example: - stp x29, x30, [sp,#-32]! - mov x29, sp - stp x1, x2, [sp,#16] - ... - ldp x1, x2, [sp,#16] - ldp x29, x30, [sp],#32 - ret -*/ - -/* push r1 and r2, and alloc stack space for a total of - alloc_n elements (1 element=16 bytes, must be between 1 and 31. */ -static inline void tcg_out_push_pair(TCGContext *s, TCGReg addr, - TCGReg r1, TCGReg r2, int alloc_n) -{ - /* using indexed scaled simm7 STP 0x28800000 | (ext) | 0x01000000 (pre-idx) - | alloc_n * (-1) << 16 | r2 << 10 | addr << 5 | r1 */ - assert(alloc_n > 0 && alloc_n < 0x20); - alloc_n = (-alloc_n) & 0x3f; - tcg_out32(s, 0xa9800000 | alloc_n << 16 | r2 << 10 | addr << 5 | r1); -} - -/* dealloc stack space for a total of alloc_n elements and pop r1, r2. */ -static inline void tcg_out_pop_pair(TCGContext *s, TCGReg addr, - TCGReg r1, TCGReg r2, int alloc_n) -{ - /* using indexed scaled simm7 LDP 0x28c00000 | (ext) | nothing (post-idx) - | alloc_n << 16 | r2 << 10 | addr << 5 | r1 */ - assert(alloc_n > 0 && alloc_n < 0x20); - tcg_out32(s, 0xa8c00000 | alloc_n << 16 | r2 << 10 | addr << 5 | r1); -} - -static inline void tcg_out_store_pair(TCGContext *s, TCGReg addr, - TCGReg r1, TCGReg r2, int idx) -{ - /* using register pair offset simm7 STP 0x29000000 | (ext) - | idx << 16 | r2 << 10 | addr << 5 | r1 */ - assert(idx > 0 && idx < 0x20); - tcg_out32(s, 0xa9000000 | idx << 16 | r2 << 10 | addr << 5 | r1); -} - -static inline void tcg_out_load_pair(TCGContext *s, TCGReg addr, - TCGReg r1, TCGReg r2, int idx) -{ - /* using register pair offset simm7 LDP 0x29400000 | (ext) - | idx << 16 | r2 << 10 | addr << 5 | r1 */ - assert(idx > 0 && idx < 0x20); - tcg_out32(s, 0xa9400000 | idx << 16 | r2 << 10 | addr << 5 | r1); -} - static void tcg_out_op(TCGContext *s, TCGOpcode opc, const TCGArg args[TCG_MAX_OP_ARGS], const int const_args[TCG_MAX_OP_ARGS]) @@ -1887,33 +1855,32 @@ static void tcg_target_qemu_prologue(TCGContext *s) TCGReg r; /* save pairs (FP, LR) and (X19, X20) .. (X27, X28) */ - frame_size_callee_saved = (1) + (TCG_REG_X28 - TCG_REG_X19) / 2 + 1; + frame_size_callee_saved = 16 + (TCG_REG_X28 - TCG_REG_X19 + 1) * 8; /* frame size requirement for TCG local variables */ frame_size_tcg_locals = TCG_STATIC_CALL_ARGS_SIZE + CPU_TEMP_BUF_NLONGS * sizeof(long) + (TCG_TARGET_STACK_ALIGN - 1); frame_size_tcg_locals &= ~(TCG_TARGET_STACK_ALIGN - 1); - frame_size_tcg_locals /= TCG_TARGET_STACK_ALIGN; - /* push (FP, LR) and update sp */ - tcg_out_push_pair(s, TCG_REG_SP, - TCG_REG_FP, TCG_REG_LR, frame_size_callee_saved); + /* Push (FP, LR) and allocate space for all saved registers. */ + tcg_out_insn(s, 3314, STP, TCG_REG_FP, TCG_REG_LR, + TCG_REG_SP, -frame_size_callee_saved, 1, 1); /* Set up frame pointer for canonical unwinding. */ tcg_out_movr_sp(s, TCG_TYPE_I64, TCG_REG_FP, TCG_REG_SP); /* Store callee-preserved regs x19..x28. */ for (r = TCG_REG_X19; r <= TCG_REG_X27; r += 2) { - int idx = (r - TCG_REG_X19) / 2 + 1; - tcg_out_store_pair(s, TCG_REG_SP, r, r + 1, idx); + int ofs = (r - TCG_REG_X19 + 2) * 8; + tcg_out_insn(s, 3314, STP, r, r + 1, TCG_REG_SP, ofs, 1, 0); } /* Make stack space for TCG locals. */ tcg_out_insn(s, 3401, SUBI, TCG_TYPE_I64, TCG_REG_SP, TCG_REG_SP, - frame_size_tcg_locals * TCG_TARGET_STACK_ALIGN); + frame_size_tcg_locals); - /* inform TCG about how to find TCG locals with register, offset, size */ + /* Inform TCG about how to find TCG locals with register, offset, size. */ tcg_set_frame(s, TCG_REG_SP, TCG_STATIC_CALL_ARGS_SIZE, CPU_TEMP_BUF_NLONGS * sizeof(long)); @@ -1931,17 +1898,16 @@ static void tcg_target_qemu_prologue(TCGContext *s) /* Remove TCG locals stack space. */ tcg_out_insn(s, 3401, ADDI, TCG_TYPE_I64, TCG_REG_SP, TCG_REG_SP, - frame_size_tcg_locals * TCG_TARGET_STACK_ALIGN); + frame_size_tcg_locals); - /* restore registers x19..x28. - FP must be preserved, so it still points to callee_saved area */ + /* Restore registers x19..x28. */ for (r = TCG_REG_X19; r <= TCG_REG_X27; r += 2) { - int idx = (r - TCG_REG_X19) / 2 + 1; - tcg_out_load_pair(s, TCG_REG_SP, r, r + 1, idx); + int ofs = (r - TCG_REG_X19 + 2) * 8; + tcg_out_insn(s, 3314, LDP, r, r + 1, TCG_REG_SP, ofs, 1, 0); } - /* pop (FP, LR), restore SP to previous frame, return */ - tcg_out_pop_pair(s, TCG_REG_SP, - TCG_REG_FP, TCG_REG_LR, frame_size_callee_saved); + /* Pop (FP, LR), restore SP to previous frame. */ + tcg_out_insn(s, 3314, LDP, TCG_REG_FP, TCG_REG_LR, + TCG_REG_SP, frame_size_callee_saved, 0, 1); tcg_out_insn(s, 3207, RET, TCG_REG_LR); } |