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Diffstat (limited to 'src/libmach/access.c')
| -rw-r--r-- | src/libmach/access.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/src/libmach/access.c b/src/libmach/access.c new file mode 100644 index 000000000..0ee75d148 --- /dev/null +++ b/src/libmach/access.c @@ -0,0 +1,241 @@ +// Inferno libmach/access.c +// http://code.google.com/p/inferno-os/source/browse/utils/libmach/access.c +// +// Copyright © 1994-1999 Lucent Technologies Inc. +// Power PC support Copyright © 1995-2004 C H Forsyth (forsyth@terzarima.net). +// Portions Copyright © 1997-1999 Vita Nuova Limited. +// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com). +// Revisions Copyright © 2000-2004 Lucent Technologies Inc. and others. +// Portions Copyright © 2009 The Go Authors. All rights reserved. +// +// 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. + +/* + * functions to read and write an executable or file image + */ + +#include <u.h> +#include <libc.h> +#include <bio.h> +#include <mach.h> + +static int mget(Map*, uvlong, void*, int); +static int mput(Map*, uvlong, void*, int); +static Seg* reloc(Map*, uvlong, vlong*); + +/* + * routines to get/put various types + */ +int +geta(Map *map, uvlong addr, uvlong *x) +{ + uint32 l; + uvlong vl; + + if (mach->szaddr == 8){ + if (get8(map, addr, &vl) < 0) + return -1; + *x = vl; + return 1; + } + + if (get4(map, addr, &l) < 0) + return -1; + *x = l; + + return 1; +} + +int +get8(Map *map, uvlong addr, uvlong *x) +{ + if (!map) { + werrstr("get8: invalid map"); + return -1; + } + + if (map->nsegs == 1 && map->seg[0].fd < 0) { + *x = addr; + return 1; + } + if (mget(map, addr, x, 8) < 0) + return -1; + *x = machdata->swav(*x); + return 1; +} + +int +get4(Map *map, uvlong addr, uint32 *x) +{ + if (!map) { + werrstr("get4: invalid map"); + return -1; + } + + if (map->nsegs == 1 && map->seg[0].fd < 0) { + *x = addr; + return 1; + } + if (mget(map, addr, x, 4) < 0) + return -1; + *x = machdata->swal(*x); + return 1; +} + +int +get2(Map *map, uvlong addr, ushort *x) +{ + if (!map) { + werrstr("get2: invalid map"); + return -1; + } + + if (map->nsegs == 1 && map->seg[0].fd < 0) { + *x = addr; + return 1; + } + if (mget(map, addr, x, 2) < 0) + return -1; + *x = machdata->swab(*x); + return 1; +} + +int +get1(Map *map, uvlong addr, uchar *x, int size) +{ + uchar *cp; + + if (!map) { + werrstr("get1: invalid map"); + return -1; + } + + if (map->nsegs == 1 && map->seg[0].fd < 0) { + cp = (uchar*)&addr; + while (cp < (uchar*)(&addr+1) && size-- > 0) + *x++ = *cp++; + while (size-- > 0) + *x++ = 0; + } else + return mget(map, addr, x, size); + return 1; +} + +int +puta(Map *map, uvlong addr, uvlong v) +{ + if (mach->szaddr == 8) + return put8(map, addr, v); + + return put4(map, addr, v); +} + +int +put8(Map *map, uvlong addr, uvlong v) +{ + if (!map) { + werrstr("put8: invalid map"); + return -1; + } + v = machdata->swav(v); + return mput(map, addr, &v, 8); +} + +int +put4(Map *map, uvlong addr, uint32 v) +{ + if (!map) { + werrstr("put4: invalid map"); + return -1; + } + v = machdata->swal(v); + return mput(map, addr, &v, 4); +} + +int +put2(Map *map, uvlong addr, ushort v) +{ + if (!map) { + werrstr("put2: invalid map"); + return -1; + } + v = machdata->swab(v); + return mput(map, addr, &v, 2); +} + +int +put1(Map *map, uvlong addr, uchar *v, int size) +{ + if (!map) { + werrstr("put1: invalid map"); + return -1; + } + return mput(map, addr, v, size); +} + +static int +mget(Map *map, uvlong addr, void *buf, int size) +{ + uvlong off; + Seg *s; + + s = reloc(map, addr, (vlong*)&off); + if (!s) + return -1; + if (s->rw == nil) { + werrstr("unreadable map"); + return -1; + } + return s->rw(map, s, off, buf, size, 1); +} + +static int +mput(Map *map, uvlong addr, void *buf, int size) +{ + vlong off; + Seg *s; + + s = reloc(map, addr, &off); + if (!s) + return -1; + if (s->rw == nil) { + werrstr("unwritable map"); + return -1; + } + return s->rw(map, s, off, buf, size, 0); +} + +/* + * convert address to file offset; returns nonzero if ok + */ +static Seg* +reloc(Map *map, uvlong addr, vlong *offp) +{ + int i; + + for (i = 0; i < map->nsegs; i++) { + if (map->seg[i].inuse) + if (map->seg[i].b <= addr && addr < map->seg[i].e) { + *offp = addr + map->seg[i].f - map->seg[i].b; + return &map->seg[i]; + } + } + werrstr("can't translate address %llux", addr); + return 0; +} |