@@ -75,8 +75,13 @@ long arch_ptrace(struct task_struct *child, long request,
flush_fp_to_thread(child);
if (fpidx < (PT_FPSCR - PT_FPR0))
- memcpy(&tmp, &child->thread.TS_FPR(fpidx),
- sizeof(long));
+ if (IS_ENABLED(CONFIG_PPC32)) {
+ // On 32-bit the index we are passed refers to 32-bit words
+ tmp = ((u32 *)child->thread.fp_state.fpr)[fpidx];
+ } else {
+ memcpy(&tmp, &child->thread.TS_FPR(fpidx),
+ sizeof(long));
+ }
else
tmp = child->thread.fp_state.fpscr;
}
@@ -108,8 +113,13 @@ long arch_ptrace(struct task_struct *child, long request,
flush_fp_to_thread(child);
if (fpidx < (PT_FPSCR - PT_FPR0))
- memcpy(&child->thread.TS_FPR(fpidx), &data,
- sizeof(long));
+ if (IS_ENABLED(CONFIG_PPC32)) {
+ // On 32-bit the index we are passed refers to 32-bit words
+ ((u32 *)child->thread.fp_state.fpr)[fpidx] = data;
+ } else {
+ memcpy(&child->thread.TS_FPR(fpidx), &data,
+ sizeof(long));
+ }
else
child->thread.fp_state.fpscr = data;
ret = 0;
@@ -478,4 +488,7 @@ void __init pt_regs_check(void)
* real registers.
*/
BUILD_BUG_ON(PT_DSCR < sizeof(struct user_pt_regs) / sizeof(unsigned long));
+
+ // ptrace_get/put_fpr() rely on PPC32 and VSX being incompatible
+ BUILD_BUG_ON(IS_ENABLED(CONFIG_PPC32) && IS_ENABLED(CONFIG_VSX));
}