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| author |   Russell Currey <ruscur@russell.cc> | 2019-03-27 14:35:54 +1100 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2019-04-20 22:02:12 +1000 |
| commit | 56c46bba9bbfe229b4472a5be313c44c5b714a39 (patch) | |
| tree | 2774a129f5696d9167a8500a1f1d25671f93b96b /arch/powerpc/kernel | |
| parent | powerpc/embedded6xx: Remove unused functions holly_power_off and holly_halt (diff) | |
| download | linux-dev-56c46bba9bbfe229b4472a5be313c44c5b714a39.tar.xz linux-dev-56c46bba9bbfe229b4472a5be313c44c5b714a39.zip | |
powerpc/64: Fix booting large kernels with STRICT_KERNEL_RWX
With STRICT_KERNEL_RWX enabled anything marked __init is placed at a 16M
boundary. This is necessary so that it can be repurposed later with
different permissions. However, in kernels with text larger than 16M,
this pushes early_setup past 32M, incapable of being reached by the
branch instruction.
Fix this by setting the CTR and branching there instead.
Fixes: 1e0fc9d1eb2b ("powerpc/Kconfig: Enable STRICT_KERNEL_RWX for some configs")
Signed-off-by: Russell Currey <ruscur@russell.cc>
[mpe: Fix it to work on BE by using DOTSYM()]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/head_64.S | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S index 3fad8d499767..5321a11c2835 100644 --- a/arch/powerpc/kernel/head_64.S +++ b/arch/powerpc/kernel/head_64.S @@ -968,7 +968,9 @@ start_here_multiplatform: /* Restore parameters passed from prom_init/kexec */ mr r3,r31 - bl early_setup /* also sets r13 and SPRG_PACA */ + LOAD_REG_ADDR(r12, DOTSYM(early_setup)) + mtctr r12 + bctrl /* also sets r13 and SPRG_PACA */ LOAD_REG_ADDR(r3, start_here_common) ld r4,PACAKMSR(r13) |