| /* |
| * TCG Backend Data: load-store optimization only. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to deal |
| * in the Software without restriction, including without limitation the rights |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| * copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| * THE SOFTWARE. |
| */ |
| |
| typedef struct TCGLabelQemuLdst { |
| bool is_ld; /* qemu_ld: true, qemu_st: false */ |
| TCGMemOpIdx oi; |
| TCGType type; /* result type of a load */ |
| TCGReg addrlo_reg; /* reg index for low word of guest virtual addr */ |
| TCGReg addrhi_reg; /* reg index for high word of guest virtual addr */ |
| TCGReg datalo_reg; /* reg index for low word to be loaded or stored */ |
| TCGReg datahi_reg; /* reg index for high word to be loaded or stored */ |
| tcg_insn_unit *raddr; /* gen code addr of the next IR of qemu_ld/st IR */ |
| tcg_insn_unit *label_ptr[2]; /* label pointers to be updated */ |
| QSIMPLEQ_ENTRY(TCGLabelQemuLdst) next; |
| } TCGLabelQemuLdst; |
| |
| |
| /* |
| * Generate TB finalization at the end of block |
| */ |
| |
| static bool tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *l); |
| static bool tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *l); |
| |
| static int tcg_out_ldst_finalize(TCGContext *s) |
| { |
| TCGLabelQemuLdst *lb; |
| |
| /* qemu_ld/st slow paths */ |
| QSIMPLEQ_FOREACH(lb, &s->ldst_labels, next) { |
| if (lb->is_ld |
| ? !tcg_out_qemu_ld_slow_path(s, lb) |
| : !tcg_out_qemu_st_slow_path(s, lb)) { |
| return -2; |
| } |
| |
| /* Test for (pending) buffer overflow. The assumption is that any |
| one operation beginning below the high water mark cannot overrun |
| the buffer completely. Thus we can test for overflow after |
| generating code without having to check during generation. */ |
| if (unlikely((void *)s->code_ptr > s->code_gen_highwater)) { |
| return -1; |
| } |
| } |
| return 0; |
| } |
| |
| /* |
| * Allocate a new TCGLabelQemuLdst entry. |
| */ |
| |
| static inline TCGLabelQemuLdst *new_ldst_label(TCGContext *s) |
| { |
| TCGLabelQemuLdst *l = tcg_malloc(sizeof(*l)); |
| |
| QSIMPLEQ_INSERT_TAIL(&s->ldst_labels, l, next); |
| |
| return l; |
| } |