| // Copyright 2014 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| // TODO #include "../../cmd/ld/textflag.h" |
| |
| #define NOSPLIT 4 |
| |
| // Functions that return details about our address space. |
| // They use the C-defined symbols like edata and also know |
| // a little about the heap and memory layout. |
| |
| // From the linker. Well-known but might change. |
| // TODO: Is there a better way to know this? |
| #define ELFRESERVE 3072 |
| #define INITTEXT ((1<<22)+ELFRESERVE) |
| |
| // base of the address space. |
| TEXT ·base(SB), NOSPLIT, $0 |
| MOVQ $INITTEXT, ret+0(FP) |
| RET |
| |
| // end of the text segment. |
| TEXT ·etext(SB), NOSPLIT, $0 |
| LEAQ etext+0(SB), BX |
| MOVQ BX, ret+0(FP) |
| RET |
| |
| // end of the data segment. |
| TEXT ·edata(SB), NOSPLIT, $0 |
| LEAQ edata+0(SB), BX |
| MOVQ BX, ret+0(FP) |
| RET |
| |
| // end of the pre-defined address space. |
| TEXT ·end(SB), NOSPLIT, $0 |
| LEAQ end+0(SB), BX |
| MOVQ BX, ret+0(FP) |
| RET |
| |
| // These are offsets of critical fields of runtime.mheap. |
| // TODO: Very susceptible to change! They (or something equivalent) need to be published by runtime. |
| #define arena_start_offset 28840 |
| #define arena_used_offset 28848 |
| #define arena_end_offset 28856 |
| |
| // start of heap. |
| TEXT ·heapStart(SB), NOSPLIT, $0 |
| MOVQ runtime·mheap+arena_start_offset(SB), BX |
| MOVQ BX, ret+0(FP) |
| RET |
| |
| // end of active region of heap. |
| TEXT ·heapUsed(SB), NOSPLIT, $0 |
| MOVQ runtime·mheap+arena_used_offset(SB), BX |
| MOVQ BX, ret+0(FP) |
| RET |
| |
| // end of all of heap. |
| TEXT ·heapEnd(SB), NOSPLIT, $0 |
| MOVQ runtime·mheap+arena_end_offset(SB), BX |
| MOVQ BX, ret+0(FP) |
| RET |
