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Diffstat (limited to 'mdk-stage1/dietlibc/profiling/PORTING')
| -rw-r--r-- | mdk-stage1/dietlibc/profiling/PORTING | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/mdk-stage1/dietlibc/profiling/PORTING b/mdk-stage1/dietlibc/profiling/PORTING new file mode 100644 index 000000000..c3fc5eba7 --- /dev/null +++ b/mdk-stage1/dietlibc/profiling/PORTING @@ -0,0 +1,25 @@ + Porting to other platforms + + ... is easy. Just create an mcount.S in the $ARCH + directory (eg. dietlibc/i386) which includes a + function (called "mcount") that: + + 1.) saves ALL registers that are freely usable + and which might be used by __mcount(). + 2.) loads the instruction pointer (PC) from the + function that called mcount, and the function + which called the function, that called mcount + into the first two argument registers (or push + them on the stack - depending on the processor- + architecture). + 3.) call __mcount. + 4.) restore the registers saved in 1) + + Then You need a macro called PC in <asm/sigcontext.h> + which extracts the (instruction pointer / program + counter) from a sigcontext structure (eg. on i386 this + would be ctx.eip). + + $ARCH/start.S must also be modified to call monitor + with the offset of .text and _etext as parameters. + |