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arm64: entry.S: Add ventry overflow sanity checks
Subsequent patches add even more code to the ventry slots. Ensure kernels that overflow a ventry slot don't get built. Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: James Morse <james.morse@arm.com>
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@ -37,6 +37,7 @@
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.macro kernel_ventry, el:req, ht:req, regsize:req, label:req
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.align 7
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.Lventry_start\@:
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#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
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.if \el == 0
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alternative_if ARM64_UNMAP_KERNEL_AT_EL0
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@ -95,6 +96,7 @@ alternative_else_nop_endif
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mrs x0, tpidrro_el0
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#endif
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b el\el\ht\()_\regsize\()_\label
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.org .Lventry_start\@ + 128 // Did we overflow the ventry slot?
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.endm
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.macro tramp_alias, dst, sym
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@ -662,6 +664,7 @@ alternative_else_nop_endif
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add x30, x30, #(1b - tramp_vectors)
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isb
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ret
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.org 1b + 128 // Did we overflow the ventry slot?
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.endm
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.macro tramp_exit, regsize = 64
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