Differential D20598 Diff 58508 libexec/rtld-elf/powerpc/reloc.c

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libexec/rtld-elf/powerpc/reloc.c

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#define min(a,b) (((a) < (b)) ? (a) : (b))		#define min(a,b) (((a) < (b)) ? (a) : (b))
#define max(a,b) (((a) > (b)) ? (a) : (b))		#define max(a,b) (((a) > (b)) ? (a) : (b))

#define PLT_EXTENDED_BEGIN (1 << 13)		#define PLT_EXTENDED_BEGIN (1 << 13)
#define JMPTAB_BASE(N) (18 + N*2 + ((N > PLT_EXTENDED_BEGIN) ? \		#define JMPTAB_BASE(N) (18 + N*2 + ((N > PLT_EXTENDED_BEGIN) ? \
(N - PLT_EXTENDED_BEGIN)*2 : 0))		(N - PLT_EXTENDED_BEGIN)*2 : 0))

		void _rtld_bind_secureplt_start(void);

/*		/*
* Process the R_PPC_COPY relocations		* Process the R_PPC_COPY relocations
*/		*/
int		int
do_copy_relocations(Obj_Entry *dstobj)		do_copy_relocations(Obj_Entry *dstobj)
{		{
const Elf_Rela *relalim;		const Elf_Rela *relalim;
const Elf_Rela *rela;		const Elf_Rela *rela;
▲ Show 20 Lines • Show All 288 Lines • ▼ Show 20 Lines	reloc_plt_object(Obj_Entry obj, const Elf_Rela rela)
int N = obj->pltrelasize / sizeof(Elf_Rela);		int N = obj->pltrelasize / sizeof(Elf_Rela);
int reloff;		int reloff;

reloff = rela - obj->pltrela;		reloff = rela - obj->pltrela;

if (reloff < 0)		if (reloff < 0)
return (-1);		return (-1);

		if (obj->gotptr != NULL) {
		*where += (Elf_Addr)obj->relocbase;
		return (0);
		}

pltlongresolve = obj->pltgot + 5;		pltlongresolve = obj->pltgot + 5;
pltresolve = pltlongresolve + 5;		pltresolve = pltlongresolve + 5;

distance = (Elf_Addr)pltresolve - (Elf_Addr)(where + 1);		distance = (Elf_Addr)pltresolve - (Elf_Addr)(where + 1);

dbg(" reloc_plt_object: where=%p,pltres=%p,reloff=%x,distance=%x",		dbg(" reloc_plt_object: where=%p,pltres=%p,reloff=%x,distance=%x",
(void )where, (void )pltresolve, reloff, distance);		(void )where, (void )pltresolve, reloff, distance);

▲ Show 20 Lines • Show All 124 Lines • ▼ Show 20 Lines	reloc_jmpslot(Elf_Addr *wherep, Elf_Addr target,

/*		/*
* At the PLT entry pointed at by `wherep', construct		* At the PLT entry pointed at by `wherep', construct
* a direct transfer to the now fully resolved function		* a direct transfer to the now fully resolved function
* address.		* address.
*/		*/
offset = target - (Elf_Addr)wherep;		offset = target - (Elf_Addr)wherep;

		if (obj->gotptr != NULL) {
		assert(wherep >= (Elf_Word *)obj->pltgot);
		assert(wherep <
		(Elf_Word *)obj->pltgot + obj->pltrelasize);
		*wherep = target;
		goto out;
		}

if (abs((int)offset) < 3210241024) { /* inside 32MB? */		if (abs((int)offset) < 3210241024) { /* inside 32MB? */
/* b value # branch directly */		/* b value # branch directly */
*wherep = 0x48000000 \| (offset & 0x03fffffc);		*wherep = 0x48000000 \| (offset & 0x03fffffc);
__syncicache(wherep, 4);		__syncicache(wherep, 4);
} else {		} else {
Elf_Addr pltcall, jmptab;		Elf_Addr pltcall, jmptab;
int distance;		int distance;
int N = obj->pltrelasize / sizeof(Elf_Rela);		int N = obj->pltrelasize / sizeof(Elf_Rela);
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{		{
Elf_Word pltcall, pltresolve, *pltlongresolve;		Elf_Word pltcall, pltresolve, *pltlongresolve;
Elf_Word *jmptab;		Elf_Word *jmptab;
int N = obj->pltrelasize / sizeof(Elf_Rela);		int N = obj->pltrelasize / sizeof(Elf_Rela);

pltcall = obj->pltgot;		pltcall = obj->pltgot;

if (pltcall == NULL) {		if (pltcall == NULL) {
		return;
		}

		/* Handle Secure-PLT first, if applicable. */
		if (obj->gotptr != NULL) {
		obj->gotptr[1] = (Elf_Addr)_rtld_bind_secureplt_start;
		obj->gotptr[2] = (Elf_Addr)obj;
		dbg("obj %s secure-plt gotptr=%p start=%p obj=%p",
		obj->path, obj->gotptr,
		(void )obj->gotptr[1], (void )obj->gotptr[2]);
return;		return;
}		}

/*		/*
* From the SVR4 PPC ABI:		* From the SVR4 PPC ABI:
*		*
* 'The first 18 words (72 bytes) of the PLT are reserved for		* 'The first 18 words (72 bytes) of the PLT are reserved for
* use by the dynamic linker.		* use by the dynamic linker.
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