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Message-ID: <20191115093209.26434-3-yanaijie@huawei.com> Date: Fri, 15 Nov 2019 17:32:05 +0800 From: Jason Yan <yanaijie@...wei.com> To: <mpe@...erman.id.au>, <linuxppc-dev@...ts.ozlabs.org>, <diana.craciun@....com>, <christophe.leroy@....fr>, <benh@...nel.crashing.org>, <paulus@...ba.org>, <npiggin@...il.com>, <keescook@...omium.org>, <kernel-hardening@...ts.openwall.com> CC: <linux-kernel@...r.kernel.org>, <oss@...error.net>, Jason Yan <yanaijie@...wei.com> Subject: [PATCH 2/6] powerpc/fsl_booke/64: introduce reloc_kernel_entry() helper Like the 32bit code, we introduce reloc_kernel_entry() helper to prepare for the KASLR 64bit version. And move the C declaration of this function out of CONFIG_PPC32 and use long instead of int for the parameter 'addr'. Signed-off-by: Jason Yan <yanaijie@...wei.com> Cc: Scott Wood <oss@...error.net> Cc: Diana Craciun <diana.craciun@....com> Cc: Michael Ellerman <mpe@...erman.id.au> Cc: Christophe Leroy <christophe.leroy@....fr> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org> Cc: Paul Mackerras <paulus@...ba.org> Cc: Nicholas Piggin <npiggin@...il.com> Cc: Kees Cook <keescook@...omium.org> --- arch/powerpc/kernel/exceptions-64e.S | 13 +++++++++++++ arch/powerpc/mm/mmu_decl.h | 3 ++- 2 files changed, 15 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S index e4076e3c072d..1b9b174bee86 100644 --- a/arch/powerpc/kernel/exceptions-64e.S +++ b/arch/powerpc/kernel/exceptions-64e.S @@ -1679,3 +1679,16 @@ _GLOBAL(setup_ehv_ivors) _GLOBAL(setup_lrat_ivor) SET_IVOR(42, 0x340) /* LRAT Error */ blr + +/* + * Return to the start of the relocated kernel and run again + * r3 - virtual address of fdt + * r4 - entry of the kernel + */ +_GLOBAL(reloc_kernel_entry) + mfmsr r7 + rlwinm r7, r7, 0, ~(MSR_IS | MSR_DS) + + mtspr SPRN_SRR0,r4 + mtspr SPRN_SRR1,r7 + rfi diff --git a/arch/powerpc/mm/mmu_decl.h b/arch/powerpc/mm/mmu_decl.h index 8e99649c24fc..3e1c85c7d10b 100644 --- a/arch/powerpc/mm/mmu_decl.h +++ b/arch/powerpc/mm/mmu_decl.h @@ -140,9 +140,10 @@ extern void adjust_total_lowmem(void); extern int switch_to_as1(void); extern void restore_to_as0(int esel, int offset, void *dt_ptr, int bootcpu); void create_kaslr_tlb_entry(int entry, unsigned long virt, phys_addr_t phys); -void reloc_kernel_entry(void *fdt, int addr); extern int is_second_reloc; #endif + +void reloc_kernel_entry(void *fdt, long addr); extern void loadcam_entry(unsigned int index); extern void loadcam_multi(int first_idx, int num, int tmp_idx); -- 2.17.2
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