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[librm] Provide symbols for inline code placed into other sections 

Provide symbols constructed from the object name and line number for
code fragments placed into alternative sections, such as inline
REAL_CODE() assembly placed into .text16.  This simplifies the
debugging task of finding the source code corresponding to a given
instruction pointer.

Note that we cannot use __FUNCTION__ since it is not a preprocessor
macro and so cannot be concatenated with string literals.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/71/head
Michael Brown 2018-03-21 14:39:18 +02:00
parent 0600ffeb30
commit 6149e0af3c
1 changed files with 5 additions and 0 deletions
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5
src/arch/x86/include/librm.h
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@ -254,9 +254,13 @@ extern void remove_user_from_rm_stack ( userptr_t data, size_t size );
#define CODE_DEFAULT ".code32"
#endif
/* LINE_SYMBOL: declare a symbol for the current source code line */
#define LINE_SYMBOL _S2 ( OBJECT ) "__line_" _S2 ( __LINE__ ) ":"
/* TEXT16_CODE: declare a fragment of code that resides in .text16 */
#define TEXT16_CODE( asm_code_str ) \
".section \".text16\", \"ax\", @progbits\n\t" \
"\n" LINE_SYMBOL "\n\t" \
".code16\n\t" \
asm_code_str "\n\t" \
CODE_DEFAULT "\n\t" \
@ -276,6 +280,7 @@ extern void remove_user_from_rm_stack ( userptr_t data, size_t size );
"push $1f\n\t" \
"call phys_call\n\t" \
".section \".text.phys\", \"ax\", @progbits\n\t"\
"\n" LINE_SYMBOL "\n\t" \
".code32\n\t" \
"\n1:\n\t" \
asm_code_str \