sysdeps/linux-gnu/ppc/plt.c

#include <gelf.h>
#include "ltrace.h"
#include "elf.h"
#include "debug.h"
#include "ptrace.h"
#include "options.h"

GElf_Addr arch_plt_sym_val(struct ltelf *lte, size_t ndx, GElf_Rela * rela)
{
	return rela->r_offset;
}

void *plt2addr(struct process *proc, void **plt)
{
	long addr;

	debug(3, 0);

	if (proc->e_machine == EM_PPC || plt == 0)
		return (void *)plt;

	if (proc->pid == 0)
		return (void *)0;

	// On a PowerPC-64 system, a plt is three 64-bit words: the first is the
	// 64-bit address of the routine.  Before the PLT has been initialized, this
	// will be 0x0. In fact, the symbol table won't have the plt's address even.
	// Ater the PLT has been initialized, but before it has been resolved, the
	// first word will be the address of the function in the dynamic linker that
	// will reslove the PLT.  After the PLT is resolved, this will will be the
	// address of the routine whose symbol is in the symbol table.

	addr = ptrace(PTRACE_PEEKTEXT, proc->pid, plt);

	if (opt_d >= 3) {
		xinfdump(proc->pid, plt, sizeof(void *) * 3);
	}

	return (void *)addr;
}