diff options
Diffstat (limited to 'usr/src/uts/sparc/dtrace/dtrace_asm.s')
| -rw-r--r-- | usr/src/uts/sparc/dtrace/dtrace_asm.s | 43 |
1 files changed, 42 insertions, 1 deletions
diff --git a/usr/src/uts/sparc/dtrace/dtrace_asm.s b/usr/src/uts/sparc/dtrace/dtrace_asm.s index 62c8662548..a0cbd8f50e 100644 --- a/usr/src/uts/sparc/dtrace/dtrace_asm.s +++ b/usr/src/uts/sparc/dtrace/dtrace_asm.s @@ -555,7 +555,7 @@ dtrace_getupcstack_top(uint64_t *pcstack, int pcstack_limit, uintptr_t *sp) rdpr %cwp, %g4 ! remember our window so we can return rdpr %canrestore, %g2 ! compute the first non-user window - subcc %g4, %g2, %g2 ! current = %cwp - %otherwin + subcc %g4, %g2, %g2 ! current = %cwp - %canrestore bge,pt %xcc, 1f ! good to go if current is >= 0 mov %g5, %o0 ! we need to return the count @@ -592,6 +592,47 @@ dtrace_getupcstack_top(uint64_t *pcstack, int pcstack_limit, uintptr_t *sp) #endif +#if defined(lint) + +/*ARGSUSED*/ +int +dtrace_getustackdepth_top(uintptr_t *sp) +{ return (0); } + +#else + + ENTRY(dtrace_getustackdepth_top) + mov %o0, %o2 + rdpr %otherwin, %o0 + + brlez,a,pn %o0, 2f ! return 0 if there are no user wins + clr %o0 + + rdpr %cwp, %g4 ! remember our window so we can return + rdpr %canrestore, %g2 ! compute the first user window + sub %g4, %g2, %g2 ! current = %cwp - %canrestore - + subcc %g2, %o0, %g2 ! %otherwin + + bge,pt %xcc, 1f ! normalize the window if necessary + sethi %hi(nwin_minus_one), %g3 + ld [%g3 + %lo(nwin_minus_one)], %g3 + add %g2, %g3, %g2 + add %g2, 1, %g2 + +1: + wrpr %g2, %cwp ! change to the first user window + mov %i6, %g6 ! stash the frame pointer + wrpr %g4, %cwp ! change back to the original window + + stn %g6, [%o2] ! return the frame pointer + +2: + retl + nop + SET_SIZE(dtrace_getustackdepth_top) + +#endif + #if defined(lint) || defined(__lint) /* ARGSUSED */ |