On Fri, Apr 09, 2021 at 05:09:07PM -0400, Michael Meissner wrote: > Fix logic error in 32-bit trampolines, PR target/98952. > > The test in the PowerPC 32-bit trampoline support is backwards. It aborts > if the trampoline size is greater than the expected size. It should abort > when the trampoline size is less than the expected size.
> PR target/98952 > * config/rs6000/tramp.S (__trampoline_setup): Fix trampoline size > comparison in 32-bit. > --- a/libgcc/config/rs6000/tramp.S > +++ b/libgcc/config/rs6000/tramp.S > @@ -64,8 +64,7 @@ FUNC_START(__trampoline_setup) > mflr r11 > addi r7,r11,trampoline_initial-4-.LCF0 /* trampoline address -4 */ > > - li r8,trampoline_size /* verify that the trampoline is big > enough */ > - cmpw cr1,r8,r4 > + cmpwi cr1,r4,trampoline_size /* verify that the trampoline is big > enough */ > srwi r4,r4,2 /* # words to move */ > addi r9,r3,-4 /* adjust pointer for lwzu */ > mtctr r4 As Will says, it looks like the ELFv2 version has the same bug. Please fix that the same way. In the commit message and the changelog, point out that you folded the cmp with the li while you were at it. It is easier to read code like this so the change is fine, but do point it out. Can you test this in a testcase somehow? That would have found the ELFv2 case, for example. Okay for trunk. Okay for backport to 11 when that branch opens again. Does this need more backports? (Those should follow after 11 of course). Thanks, Segher
