diff options
| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-03-12 12:50:29 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-03-29 13:22:06 +1100 |
| commit | dc13b889b586f499cc87eb2b0b7e901778b3b5cf (patch) | |
| tree | 61b216cf16a8358287099ae49e07b979a066be9f /arch/powerpc/kernel/head_8xx.S | |
| parent | 7bf1d7e1abab0d9f47ebce144deadb4409d0d631 (diff) | |
powerpc/32: Move exception prolog code into .text once MMU is back on
The space in the head section is rather constrained by the fact that
exception vectors are spread every 0x100 bytes and sometimes we
need to have "out of line" code because it doesn't fit.
Now that we are enabling MMU early in the prolog, take that opportunity
to jump somewhere else in the .text section where we don't have any
space constraint.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/38b31ca4bc782a4985bc7952a675404d7ff27c24.1615552867.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/kernel/head_8xx.S')
| -rw-r--r-- | arch/powerpc/kernel/head_8xx.S | 25 |
1 files changed, 10 insertions, 15 deletions
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S index 11789a077d76..d16d0ec71bb2 100644 --- a/arch/powerpc/kernel/head_8xx.S +++ b/arch/powerpc/kernel/head_8xx.S @@ -133,7 +133,7 @@ instruction_counter: START_EXCEPTION(0x600, Alignment) EXCEPTION_PROLOG handle_dar_dsisr=1 addi r3,r1,STACK_FRAME_OVERHEAD - b .Lalignment_exception_ool + EXC_XFER_STD(0x600, alignment_exception) /* Program check exception */ EXCEPTION(0x700, ProgramCheck, program_check_exception, EXC_XFER_STD) @@ -141,11 +141,6 @@ instruction_counter: /* Decrementer */ EXCEPTION(0x900, Decrementer, timer_interrupt, EXC_XFER_LITE) - /* With VMAP_STACK there's not enough room for this at 0x600 */ - . = 0xa00 -.Lalignment_exception_ool: - EXC_XFER_STD(0x600, alignment_exception) - /* System call */ START_EXCEPTION(0xc00, SystemCall) SYSCALL_ENTRY 0xc00 @@ -339,26 +334,25 @@ DARFixed:/* Return from dcbx instruction bug workaround */ * support of breakpoints and such. Someday I will get around to * using them. */ -do_databreakpoint: - EXCEPTION_PROLOG_1 - EXCEPTION_PROLOG_2 handle_dar_dsisr=1 - addi r3,r1,STACK_FRAME_OVERHEAD - mfspr r4,SPRN_BAR - stw r4,_DAR(r11) - EXC_XFER_STD(0x1c00, do_break) - START_EXCEPTION(0x1c00, DataBreakpoint) EXCEPTION_PROLOG_0 handle_dar_dsisr=1 mfspr r11, SPRN_SRR0 cmplwi cr1, r11, (.Ldtlbie - PAGE_OFFSET)@l cmplwi cr7, r11, (.Litlbie - PAGE_OFFSET)@l cror 4*cr1+eq, 4*cr1+eq, 4*cr7+eq - bne cr1, do_databreakpoint + bne cr1, 1f mtcr r10 mfspr r10, SPRN_SPRG_SCRATCH0 mfspr r11, SPRN_SPRG_SCRATCH1 rfi +1: EXCEPTION_PROLOG_1 + EXCEPTION_PROLOG_2 handle_dar_dsisr=1 + addi r3,r1,STACK_FRAME_OVERHEAD + mfspr r4,SPRN_BAR + stw r4,_DAR(r11) + EXC_XFER_STD(0x1c00, do_break) + #ifdef CONFIG_PERF_EVENTS START_EXCEPTION(0x1d00, InstructionBreakpoint) mtspr SPRN_SPRG_SCRATCH0, r10 @@ -376,6 +370,7 @@ do_databreakpoint: EXCEPTION(0x1e00, Trap_1e, unknown_exception, EXC_XFER_STD) EXCEPTION(0x1f00, Trap_1f, unknown_exception, EXC_XFER_STD) + __HEAD . = 0x2000 /* This is the procedure to calculate the data EA for buggy dcbx,dcbi instructions |