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(Redoing check-in lost by SourceForge's failure.)

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Use .text16.data section with "aw" attributes, to avoid section type
conflicts when placing both code and data into .text16.

Add __from_{text16,data16}.
This commit is contained in:
Michael Brown
2006-05-13 11:11:55 +00:00
parent 97d265f8dc
commit f7b963da51
4 changed files with 34 additions and 13 deletions
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16
src/arch/i386/include/realmode.h
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@@ -15,10 +15,12 @@
/* Segment:offset structure. Note that the order within the structure
* is offset:segment.
*/
typedef struct {
struct segoff {
uint16_t offset;
uint16_t segment;
} __attribute__ (( packed )) segoff_t;
} __attribute__ (( packed ));
typedef struct segoff segoff_t;
/* Macro hackery needed to stringify bits of inline assembly */
#define RM_XSTR(x) #x
@@ -50,8 +52,8 @@ typedef struct {
* extern uint32_t __data16 ( bar );
* #define bar __use_data16 ( bar );
*
* extern long __data16 ( baz ) = 0xff000000UL;
* #define bar __use_data16 ( baz );
* static long __data16 ( baz ) = 0xff000000UL;
* #define baz __use_data16 ( baz );
*
* i.e. take a normal declaration, add __data16() around the variable
* name, and add a line saying "#define <name> __use_data16 ( <name> )
@@ -83,6 +85,12 @@ typedef struct {
* Variables may also be placed in .text16 using __text16 and
* __use_text16. Some variables (e.g. chained interrupt vectors) fit
* most naturally in .text16; most should be in .data16.
*
* If you have only a pointer to a magic symbol within .data16 or
* .text16, rather than the symbol itself, you can attempt to extract
* the underlying symbol name using __from_data16() or
* __from_text16(). This is not for the faint-hearted; check the
* assembler output to make sure that it's doing the right thing.
*/
/*