Date: Wed, 29 Feb 2012 20:21:16 GMT From: Oleksandr Tymoshenko <gonzo@FreeBSD.org> To: Perforce Change Reviews <perforce@FreeBSD.org> Subject: PERFORCE change 207108 for review Message-ID: <201202292021.q1TKLGhs064854@skunkworks.freebsd.org>
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http://p4web.freebsd.org/@@207108?ac=10 Change 207108 by gonzo@gonzo_thinkpad on 2012/02/29 20:20:46 - Implement stackdepth handler Affected files ... .. //depot/projects/dtrace-mips/sys/cddl/dev/dtrace/mips/dtrace_isa.c#6 edit Differences ... ==== //depot/projects/dtrace-mips/sys/cddl/dev/dtrace/mips/dtrace_isa.c#6 (text+ko) ==== @@ -327,8 +327,31 @@ int dtrace_getstackdepth(int aframes) { - printf("IMPLEMENT ME: %s\n", __func__); - return (0); + register_t sp, ra, pc; + int depth = 0; + + sp = (register_t)(intptr_t)__builtin_frame_address(0); + ra = (register_t)(intptr_t)__builtin_return_address(0); + + __asm __volatile( + "jal 99f\n" + "nop\n" + "99:\n" + "move %0, $31\n" /* get ra */ + "move $31, %1\n" /* restore ra */ + : "=r" (pc) + : "r" (ra)); + + for (;;) { + if (next_frame(&pc, &sp, NULL, NULL) < 0) + break; + depth++; + } + + if (depth < aframes) + return 0; + else + return depth - aframes; } ulong_t
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