From: Helge Deller deller@gmx.de
commit 6e3220ba3323a2c24be834aebf5d6e9f89d0993f upstream.
Fix the argument pointer (ap) to point to real-mode memory instead of virtual memory.
It's interesting that this issue hasn't shown up earlier, as this could have happened with any 64-bit PDC ROM code.
I just noticed it because I suddenly faced a HPMC while trying to execute the 64-bit STI ROM code of an Visualize-FXe graphics card for the STI text console.
Signed-off-by: Helge Deller deller@gmx.de Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/parisc/kernel/real2.S | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
--- a/arch/parisc/kernel/real2.S +++ b/arch/parisc/kernel/real2.S @@ -248,9 +248,6 @@ ENTRY_CFI(real64_call_asm) /* save fn */ copy %arg2, %r31
- /* set up the new ap */ - ldo 64(%arg1), %r29 - /* load up the arg registers from the saved arg area */ /* 32-bit calling convention passes first 4 args in registers */ ldd 0*REG_SZ(%arg1), %arg0 /* note overwriting arg0 */ @@ -262,7 +259,9 @@ ENTRY_CFI(real64_call_asm) ldd 7*REG_SZ(%arg1), %r19 ldd 1*REG_SZ(%arg1), %arg1 /* do this one last! */
+ /* set up real-mode stack and real-mode ap */ tophys_r1 %sp + ldo -16(%sp), %r29 /* Reference param save area */
b,l rfi_virt2real,%r2 nop