FM / dyninst

/usr/share/systemtap/runtime/dyninst

Name	Size	Mode	Actions
addr-map.c	565	0644	edit dl rm
alloc.c	1188	0644	edit dl rm
arith.c	2291	0644	edit dl rm
common_session_state.h	6921	0644	edit dl rm
copy.c	4095	0644	edit dl rm
debug.h	413	0644	edit dl rm
ilog2.h	2943	0644	edit dl rm
io.c	4541	0644	edit dl rm
linux_defs.h	5602	0644	edit dl rm
linux_hash.h	1877	0644	edit dl rm
linux_types.h	654	0644	edit dl rm
loc2c-runtime.h	2494	0644	edit dl rm
map_list.h	1059	0644	edit dl rm
map_runtime.h	5160	0644	edit dl rm
namespaces.h	0	0644	edit dl rm
offptr.h	4788	0644	edit dl rm
offset_list.h	4428	0644	edit dl rm
perf.c	0	0644	edit dl rm
print.c	2700	0644	edit dl rm
probe_lock.h	1849	0644	edit dl rm
regs.c	2557	0644	edit dl rm
runtime.h	10292	0644	edit dl rm
runtime_context.h	6556	0644	edit dl rm
runtime_defines.h	280	0644	edit dl rm
session_attributes.c	1717	0644	edit dl rm
session_attributes.h	772	0644	edit dl rm
shm.c	6171	0644	edit dl rm
stapdyn.h	4617	0644	edit dl rm
stat_runtime.h	1832	0644	edit dl rm
sym.c	1621	0644	edit dl rm
task_finder.c	0	0644	edit dl rm
timer.c	2770	0644	edit dl rm
transport.c	31128	0644	edit dl rm
transport.h	3968	0644	edit dl rm
unwind.c	0	0644	edit dl rm
uprobes-regs.c	3163	0644	edit dl rm
uprobes.c	1798	0644	edit dl rm
uprobes.h	953	0644	edit dl rm

Edit: /usr/share/systemtap/runtime/dyninst/uprobes-regs.c (3163B)

/* -*- linux-c -*-
 * function for preparing registers for dyninst-based uprobes
 * Copyright (C) 2012-2019 Red Hat Inc.
 *
 * This file is part of systemtap, and is free software.  You can
 * redistribute it and/or modify it under the terms of the GNU General
 * Public License (GPL); either version 2, or (at your option) any
 * later version.
 */

#ifndef _UPROBES_REGS_DYNINST_C_
#define _UPROBES_REGS_DYNINST_C_

int
enter_dyninst_uprobe_partial_regs(uint64_t index, unsigned long first_reg, ...)
{
	static struct pt_regs regs = {};

va_list varegs;
	va_start(varegs, first_reg);

#if defined(__powerpc__) || defined(__powerpc64__)
//  Dyninst BPatch_funcCallExpr only supports register parms
#define MAX_REG 32
	for (unsigned long r = first_reg;
	     r < MAX_REG && r < first_reg + 6; ++r)
		pt_regs_store_register((&regs), r,
				va_arg(varegs, unsigned long));
#elif defined(__aarch64__)
#define MAX_REG 32
	for (unsigned long r = first_reg;
	     r < MAX_REG && r < first_reg + 6; ++r) {
	        if (r == 31)
	          regs.sp = va_arg(varegs, unsigned long);
	        else
	          regs.regs[r] = va_arg(varegs, unsigned long);
	}
#endif
#undef MAX_REG

// The last chunk of saved registers is r30/r31/ip
	if (first_reg == 30) {
	    SET_REG_IP((&regs), va_arg(varegs, unsigned long));
	    va_end(varegs);
	    return enter_dyninst_uprobe(index, &regs);
	}
	else {
	    va_end(varegs);
	    return 0;
	}
}

int
enter_dyninst_uprobe_regs(uint64_t index, unsigned long nregs, ...)
{
	struct pt_regs regs = {};

va_list varegs;
	va_start(varegs, nregs);

#ifdef __i386__
	// XXX Dyninst currently has a bug where it's only passing a 32-bit
	// index, which means nregs gets stuffed into the upper bits of index,
	// and the varegs are all off by one.  Hacking it into shape for now...
	if (index > UINT32_MAX) {
		SET_REG_IP((&regs), nregs);
                nregs = index >> 32;
                index &= UINT32_MAX;
        } else
#endif
	if (likely(nregs > 0))
		SET_REG_IP((&regs), va_arg(varegs, unsigned long));

#if defined(__i386__) || defined(__x86_64__)
	/* NB: x86 pt_regs_store_register() expects literal register numbers to
	 * paste as CPP tokens, so unfortunately this has to be unrolled.  */
#define SET_REG(n) if (likely(n < nregs - 1)) \
			pt_regs_store_register((&regs), n, \
					va_arg(varegs, unsigned long))
	SET_REG(0);
	SET_REG(1);
	SET_REG(2);
	SET_REG(3);
	SET_REG(4);
	SET_REG(5);
	SET_REG(6);
	SET_REG(7);
#if defined(__x86_64__)
	SET_REG(8);
	SET_REG(9);
	SET_REG(10);
	SET_REG(11);
	SET_REG(12);
	SET_REG(13);
	SET_REG(14);
	SET_REG(15);
#endif
#undef SET_REG

#else

#if defined(__powerpc__) || defined(__powerpc64__)
#define MAX_REG 32
	for (unsigned long r = 0; r < MAX_REG && r < nregs - 1; ++r)
		pt_regs_store_register((&regs), r,
				va_arg(varegs, unsigned long));
#elif defined(__aarch64__)
#define MAX_REG 32
	for (unsigned long r = 0; r < MAX_REG && r < nregs - 1; ++r)
	        regs.regs[r] = va_arg(varegs, unsigned long);

#else
#error "Unknown architecture!"
#endif
#undef MAX_REG

#endif

va_end(varegs);

return enter_dyninst_uprobe(index, &regs);
}

#endif /* _UPROBES_REGS_DYNINST_C_ */

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