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std.pie: fix register constraint in getDynamicSymbol() for s390x (#25327)

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If the compiler happens to pick `ret = r0`, then this will assemble to
`ag r0, 0` which is obviously not what we want. Using `a` instead of `r` will
ensure that we get an appropriate address register, i.e. `r1` through `r15`.

Re-enable pie_linux for s390x-linux which was disabled in
ed7ff0b693037078f451a7c6c1124611060f4892.
This commit is contained in:
Alex Rønne Petersen 2025-09-22 18:36:47 +02:00
parent 9694c83b95
commit b8f2fec0f2
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1 changed files with 1 additions and 1 deletions
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lib/std/pie.zig
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@ -177,7 +177,7 @@ inline fn getDynamicSymbol() [*]const elf.Dyn {
\\ jg 2f
\\ 1: .quad _DYNAMIC - .
\\ 2:
: [ret] "=r" (-> [*]const elf.Dyn),
: [ret] "=a" (-> [*]const elf.Dyn),
),
// The compiler does not necessarily have any obligation to load the `l7` register (pointing
// to the GOT), so do it ourselves just in case.