https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78095
--- Comment #3 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
include/valgrind.h:
3263 /* These regs are trashed by the hidden call. */
3264 #define __CALLER_SAVED_REGS \
3265 "lr", "ctr", "xer", \
3266 "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7", \
3267 "r0", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", \
3268 "r11", "r12", "r13"
3269
3270 /* Macros to save and align the stack before making a function
3271 call and restore it afterwards as gcc may not keep the stack
3272 pointer aligned if it doesn't realise calls are being made
3273 to other functions. */
3274
3275 #define VALGRIND_ALIGN_STACK \
3276 "mr 28,1\n\t" \
3277 "rldicr 1,1,0,59\n\t"
3278 #define VALGRIND_RESTORE_STACK \
3279 "mr 1,28\n\t"
3280
3281 /* These CALL_FN_ macros assume that on ppc64-linux, sizeof(unsigned
3282 long) == 8. */
3283
3284 #define CALL_FN_W_v(lval, orig) \
3285 do { \
3286 volatile OrigFn _orig = (orig); \
3287 volatile unsigned long _argvec[3+0]; \
3288 volatile unsigned long _res; \
3289 /* _argvec[0] holds current r2 across the call */ \
3290 _argvec[1] = (unsigned long)_orig.r2; \
3291 _argvec[2] = (unsigned long)_orig.nraddr; \
3292 __asm__ volatile( \
3293 VALGRIND_ALIGN_STACK \
3294 "mr 12,%1\n\t" \
3295 "std 2,-16(12)\n\t" /* save tocptr */ \
3296 "ld 2,-8(12)\n\t" /* use nraddr's tocptr */ \
3297 "ld 12, 0(12)\n\t" /* target->r12 */ \
3298 VALGRIND_BRANCH_AND_LINK_TO_NOREDIR_R12 \
3299 "mr 12,%1\n\t" \
3300 "mr %0,3\n\t" \
3301 "ld 2,-16(12)\n\t" /* restore tocptr */ \
3302 VALGRIND_RESTORE_STACK \
3303 : /*out*/ "=r" (_res) \
3304 : /*in*/ "r" (&_argvec[2]) \
3305 : /*trash*/ "cc", "memory", __CALLER_SAVED_REGS, "r28" \
3306 ); \
3307 lval = (__typeof__(lval)) _res; \
3308 } while (0)
