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| author |   Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-03-12 12:50:32 +0000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2021-03-29 13:22:07 +1100 |
| commit | 0f2793e33db2e2f062968f2ca789b6826972b05b (patch) | |
| tree | 91e6c1216c63566d06be3ff5822e5dcd7015a576 /arch/powerpc/kernel/entry_32.S | |
| parent | powerpc/32: Refactor booke critical registers saving (diff) | |
| download | linux-dev-0f2793e33db2e2f062968f2ca789b6826972b05b.tar.xz linux-dev-0f2793e33db2e2f062968f2ca789b6826972b05b.zip | |
powerpc/32: Perform normal function call in exception entry
Now that the MMU is re-enabled before calling the transfer function,
we don't need anymore that hack with the address of the handler and
the return function sitting just after the 'bl' to the transfer
fonction, that function is retrieving via a read relative to 'lr'.
Do a regular call to the transfer function, then to the handler,
then branch to the return function.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/73c00f3361ca280ef8fd7814c291bd1f5b6e2081.1615552867.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/kernel/entry_32.S')
| -rw-r--r-- | arch/powerpc/kernel/entry_32.S | 14 |
1 files changed, 4 insertions, 10 deletions
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S index ad1fd33e1126..fb849ef922fb 100644 --- a/arch/powerpc/kernel/entry_32.S +++ b/arch/powerpc/kernel/entry_32.S @@ -104,7 +104,7 @@ transfer_to_handler: #ifdef CONFIG_PPC_BOOK3S_32 kuep_lock r11, r12 #endif - b 3f + blr /* if from kernel, check interrupted DOZE/NAP mode */ 2: @@ -118,13 +118,7 @@ transfer_to_handler: #endif /* CONFIG_PPC_BOOK3S_32 || CONFIG_E500 */ .globl transfer_to_handler_cont transfer_to_handler_cont: -3: - mflr r9 - lwz r11,0(r9) /* virtual address of handler */ - lwz r9,4(r9) /* where to go when done */ - mtctr r11 - mtlr r9 - bctr /* jump to handler */ + blr #if defined (CONFIG_PPC_BOOK3S_32) || defined(CONFIG_E500) 4: rlwinm r12,r12,0,~_TLF_NAPPING @@ -404,8 +398,8 @@ fee_restarts: stw r10,_TRAP(r11) addi r3,r1,STACK_FRAME_OVERHEAD bl transfer_to_handler_full - .long unrecoverable_exception - .long ret_from_except + bl unrecoverable_exception + b ret_from_except #endif .globl ret_from_except_full |