diff options
Diffstat (limited to 'include/aout64.h')
| -rwxr-xr-x | include/aout64.h | 33 |
1 files changed, 24 insertions, 9 deletions
diff --git a/include/aout64.h b/include/aout64.h index f4eac3c..3a915a2 100755 --- a/include/aout64.h +++ b/include/aout64.h @@ -53,15 +53,30 @@ struct external_exec * entry point below TEXT_START_ADDR: (hack for SunOS shared libraries) start at 0, offset is 0, size as stated. - * entry point is EXEC_BYTES_SIZE or further into a page: - (no padding is needed; text can start after exec header. Sun + * If N_HEADER_IN_TEXT(x) is true (which defaults to being the + case when the entry point is EXEC_BYTES_SIZE or further into a page): + no padding is needed; text can start after exec header. Sun considers the text segment of such files to include the exec header; - for BFD's purposes, we don't, which makes more work for us.) + for BFD's purposes, we don't, which makes more work for us. start at TEXT_START_ADDR + EXEC_BYTES_SIZE, offset is EXEC_BYTES_SIZE, size as stated minus EXEC_BYTES_SIZE. - * entry point is less than EXEC_BYTES_SIZE into a page (e.g. page aligned): - (padding is needed so that text can start at a page boundary) - start at TEXT_START_ADDR, offset PAGE_SIZE, size as stated. */ + * If N_HEADER_IN_TEXT(x) is false (which defaults to being the case when + the entry point is less than EXEC_BYTES_SIZE into a page (e.g. page + aligned)): (padding is needed so that text can start at a page boundary) + start at TEXT_START_ADDR, offset PAGE_SIZE, size as stated. + + Specific configurations may want to hardwire N_HEADER_IN_TEXT, + for efficiency or to allow people to play games with the entry point. + In that case, you would #define N_HEADER_IN_TEXT(x) as 1 for sunos, + and as 0 for most other hosts (Sony News, Vax Ultrix, etc). + (Do this in the appropriate bfd target file.) + (The default is a heuristic that will break if people try changing + the entry point, perhaps with the ld -e flag.) + */ + +#ifndef N_HEADER_IN_TEXT +#define N_HEADER_IN_TEXT(x) (((x).a_entry & (PAGE_SIZE-1)) >= EXEC_BYTES_SIZE) +#endif #ifndef N_TXTADDR #define N_TXTADDR(x) \ @@ -69,7 +84,7 @@ struct external_exec 0: /* object file or NMAGIC */\ ((x).a_entry < TEXT_START_ADDR)? \ 0: /* shared lib */\ - ( (((x).a_entry & (PAGE_SIZE-1)) >= EXEC_BYTES_SIZE) ? \ + (N_HEADER_IN_TEXT(x) ? \ TEXT_START_ADDR + EXEC_BYTES_SIZE: /* no padding */\ TEXT_START_ADDR /* a page of padding */\ ) \ @@ -83,7 +98,7 @@ struct external_exec EXEC_BYTES_SIZE: /* object file or NMAGIC */\ ((x).a_entry < TEXT_START_ADDR)? \ 0: /* shared lib */\ - ( (((x).a_entry & (PAGE_SIZE-1)) >= EXEC_BYTES_SIZE) ? \ + (N_HEADER_IN_TEXT(x) ? \ EXEC_BYTES_SIZE: /* no padding */\ PAGE_SIZE /* a page of padding */\ ) \ @@ -100,7 +115,7 @@ struct external_exec (x).a_text: /* object file or NMAGIC */\ ((x).a_entry < TEXT_START_ADDR)? \ (x).a_text: /* shared lib */\ - ( (((x).a_entry & (PAGE_SIZE-1)) >= EXEC_BYTES_SIZE) ? \ + (N_HEADER_IN_TEXT(x) ? \ (x).a_text - EXEC_BYTES_SIZE: /* no padding */\ (x).a_text /* a page of padding */\ ) \ |