diff options
| author | Paul Selkirk <paul@psgd.org> | 2017-05-04 15:23:10 -0400 |
|---|---|---|
| committer | Paul Selkirk <paul@psgd.org> | 2017-05-04 15:23:10 -0400 |
| commit | 9cec66f9200cb573353928bd3292fb1f710e4b3c (patch) | |
| tree | de778569d4e433dcd1e0d50bde8f05775555115d /libraries/libprof/profiler.S | |
| parent | 1175ff63f2a8c4762692551403862f9f0789aef8 (diff) | |
Copy profiling code from MCUOnEclipse.
Diffstat (limited to 'libraries/libprof/profiler.S')
| -rw-r--r-- | libraries/libprof/profiler.S | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/libraries/libprof/profiler.S b/libraries/libprof/profiler.S new file mode 100644 index 0000000..1aa5c97 --- /dev/null +++ b/libraries/libprof/profiler.S @@ -0,0 +1,28 @@ +/* + * profiler.S + * Implements the gprof profiler arc counting function. + * Created on: 06.08.2015 + * Author: Erich Styger + */ + + .syntax unified + .arch armv7-m + +.globl __gnu_mcount_nc +.type __gnu_mcount_nc, %function + +__gnu_mcount_nc: +#if 0 /* dummy version, doing nothing */ + mov ip, lr + pop { lr } + bx ip +#else + push {r0, r1, r2, r3, lr} /* save registers */ + bic r1, lr, #1 /* R1 contains callee address, with thumb bit cleared */ + ldr r0, [sp, #20] /* R0 contains caller address */ + bic r0, r0, #1 /* clear thumb bit */ + bl _mcount_internal /* jump to internal _mcount() implementation */ + pop {r0, r1, r2, r3, ip, lr} /* restore saved registers */ + bx ip /* return to caller */ +#endif + |