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authorLinus Torvalds <torvalds@linux-foundation.org>2023-07-13 02:28:53 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2023-07-13 02:28:53 +0300
commit0099852f9d7322890636503146f303b41cd8663e (patch)
treeeb422855af8633bbef4623b3ad9ed496dd12e84b /arch/openrisc
parenteb26cbb1a754ccde5d4d74527dad5ba051808fad (diff)
parentdceaafd668812115037fc13a1893d068b7b880f5 (diff)
downloadlinux-0099852f9d7322890636503146f303b41cd8663e.tar.xz
Merge tag 'for-linus' of https://github.com/openrisc/linux
Pull OpenRISC fix from Stafford Horne: - During the 6.4 cycle my fpu support work broke ABI compatibility in the sigcontext struct. This was noticed by musl libc developers after the release. This fix restores the ABI. * tag 'for-linus' of https://github.com/openrisc/linux: openrisc: Union fpcsr and oldmask in sigcontext to unbreak userspace ABI
Diffstat (limited to 'arch/openrisc')
-rw-r--r--arch/openrisc/include/uapi/asm/sigcontext.h6
-rw-r--r--arch/openrisc/kernel/signal.c4
2 files changed, 6 insertions, 4 deletions
diff --git a/arch/openrisc/include/uapi/asm/sigcontext.h b/arch/openrisc/include/uapi/asm/sigcontext.h
index ca585e4af6b8..e7ffb58ff58f 100644
--- a/arch/openrisc/include/uapi/asm/sigcontext.h
+++ b/arch/openrisc/include/uapi/asm/sigcontext.h
@@ -28,8 +28,10 @@
struct sigcontext {
struct user_regs_struct regs; /* needs to be first */
- struct __or1k_fpu_state fpu;
- unsigned long oldmask;
+ union {
+ unsigned long fpcsr;
+ unsigned long oldmask; /* unused */
+ };
};
#endif /* __ASM_OPENRISC_SIGCONTEXT_H */
diff --git a/arch/openrisc/kernel/signal.c b/arch/openrisc/kernel/signal.c
index 4664a18f0787..2e7257a433ff 100644
--- a/arch/openrisc/kernel/signal.c
+++ b/arch/openrisc/kernel/signal.c
@@ -50,7 +50,7 @@ static int restore_sigcontext(struct pt_regs *regs,
err |= __copy_from_user(regs, sc->regs.gpr, 32 * sizeof(unsigned long));
err |= __copy_from_user(&regs->pc, &sc->regs.pc, sizeof(unsigned long));
err |= __copy_from_user(&regs->sr, &sc->regs.sr, sizeof(unsigned long));
- err |= __copy_from_user(&regs->fpcsr, &sc->fpu.fpcsr, sizeof(unsigned long));
+ err |= __copy_from_user(&regs->fpcsr, &sc->fpcsr, sizeof(unsigned long));
/* make sure the SM-bit is cleared so user-mode cannot fool us */
regs->sr &= ~SPR_SR_SM;
@@ -113,7 +113,7 @@ static int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
err |= __copy_to_user(sc->regs.gpr, regs, 32 * sizeof(unsigned long));
err |= __copy_to_user(&sc->regs.pc, &regs->pc, sizeof(unsigned long));
err |= __copy_to_user(&sc->regs.sr, &regs->sr, sizeof(unsigned long));
- err |= __copy_to_user(&sc->fpu.fpcsr, &regs->fpcsr, sizeof(unsigned long));
+ err |= __copy_to_user(&sc->fpcsr, &regs->fpcsr, sizeof(unsigned long));
return err;
}