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Some cleanups of N_TXTADDR and N_TXTOFF.

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This commit is contained in:
Per Bothner
1991-11-20 02:48:13 +00:00
parent 0db97eedc1
commit 8a400a1892
2 changed files with 25 additions and 16 deletions
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8
include/a.out.sun4.h
View File

@ -7,6 +7,7 @@
#define SEG_SIZE_SUN3 0x20000 /* Resolution of r/w protection hw */
#define TEXT_START_ADDR PAGE_SIZE /* Location 0 is not accessible */
#define N_HEADER_IN_TEXT(x) 1
/* Non-default definitions of the accessor macros... */
@ -16,11 +17,6 @@
N_MACHTYPE(x) == M_68020? SEG_SIZE_SUN3: \
/* Guess? */ PAGE_SIZE)
/* Offset in a.out file of the text section. For ZMAGIC, the text section
actually includes the a.out header. */
#define N_TXTOFF(x) ( (N_MAGIC((x)) == ZMAGIC) ? 0 : EXEC_BYTES_SIZE)
/* Virtual Address of text segment from the a.out file. For OMAGIC,
(almost always "unlinked .o's" these days), should be zero.
Sun added a kludge so that shared libraries linked ZMAGIC get
@ -31,4 +27,4 @@
#define N_TXTADDR(x) \
(N_MAGIC(x)==OMAGIC? 0 \
: (N_MAGIC(x) == ZMAGIC && (x).a_entry < TEXT_START_ADDR)? 0 \
: TEXT_START_ADDR)
: TEXT_START_ADDR+EXEC_BYTES_SIZE)

33
include/aout64.h
View File

@ -26,22 +26,35 @@ struct external_exec
#endif
#define _N_HDROFF(x) (N_SEGSIZE(x) - EXEC_BYTES_SIZE)
/* address in an a.out of the text section. When demand paged, it's
set up a bit to make nothing at 0, when an object file it's 0.
There's a special hack case when the entry point is < TEXT_START_ADDR
for executables, then the real start is 0
/* If the exec header is mapped in as part of a shared text segemnt.
Only relevant for ZMAGIC files. */
#ifndef N_HEADER_IN_TEXT
#define N_HEADER_IN_TEXT(x) 1
#endif
/* Virtual memory address of the text section. When demand paged, it's
set up a bit to make nothing at 0, when an object file it's 0.
There's a special hack case when the entry point is < TEXT_START_ADDR
for executables, then the real start is 0
Note that this differs from Sun's definition: They consider
the text segment to start at 0x2000; we view it as starting at 0x2000.
I.e., we never consider the exec header to be part of the text segment.
*/
#ifndef N_TXTADDR
#define N_TXTADDR(x) \
(N_MAGIC(x)==OMAGIC? 0 \
: (N_MAGIC(x) == ZMAGIC && (x).a_entry < TEXT_START_ADDR)? 0 \
(N_MAGIC(x)!=ZMAGIC? 0 \
: N_HEADER_IN_TEXT(x) ? TEXT_START_ADDR+EXEC_BYTES_SIZE \
: TEXT_START_ADDR)
#endif
/* offset in an a.out of the start of the text section. When demand
paged, this is the start of the file
*/
/* Offset in an a.out of the start of the text section. */
#define N_TXTOFF(x) ( (N_MAGIC((x)) == ZMAGIC) ? 0 : EXEC_BYTES_SIZE)
#define N_TXTOFF(x) ( N_MAGIC(x) != ZMAGIC ? EXEC_BYTES_SIZE \
: N_HEADER_IN_TEXT(x) ? EXEC_BYTES_SIZE : PAGE_SIZE)
#if ARCH_SIZE==64
#define OMAGIC 0x1001 /* Code indicating object file */
#define ZMAGIC 0x1002 /* Code indicating demand-paged executable. */