mirror of
https://github.com/AsahiLinux/m1n1
synced 2024-12-18 17:53:10 +00:00
d9561b7507
All the common/importable stuff now lives in the 'm1n1' module. General use tools are in tools/ Reverse engineering experiments are in experiments/ Signed-off-by: Hector Martin <marcan@marcan.st>
366 lines
11 KiB
Python
Executable file
366 lines
11 KiB
Python
Executable file
#!/usr/bin/env python3
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# SPDX-License-Identifier: MIT
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import sys, pathlib
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sys.path.append(str(pathlib.Path(__file__).resolve().parents[1]))
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from contextlib import contextmanager
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from m1n1.setup import *
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from m1n1.find_regs import *
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from m1n1 import asm
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p.smp_start_secondaries()
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class ARMPageTable:
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PAGESIZE = 0x4000
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def __init__(self, memalign, free):
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self.memalign = memalign
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self.free = free
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self.l0 = self.memalign(self.PAGESIZE, self.PAGESIZE)
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self.l1 = [self.memalign(self.PAGESIZE, self.PAGESIZE), self.memalign(
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self.PAGESIZE, self.PAGESIZE)]
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self.l2 = {}
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p.write64(self.l0, self.make_table_pte(self.l1[0]))
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p.write64(self.l0+8, self.make_table_pte(self.l1[1]))
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def make_table_pte(self, addr):
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# table mapping, access bit set
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return addr | 0b11 | (1 << 10)
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def map_page(self, vaddr, paddr, access_bits):
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ap = (access_bits & 0b1100) >> 2
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pxn = (access_bits & 0b0010) >> 1
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uxn = (access_bits & 0b0001)
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# block mapping, access bit set
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pte = paddr | 0b01 | (1 << 10)
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# move access bits in place
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pte |= ap << 6
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pte |= pxn << 54
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pte |= uxn << 53
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l0_idx = (vaddr >> (25+11+11)) & 1
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l1_idx = (vaddr >> (25+11)) & 0x7ff
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l2_idx = (vaddr >> 25) & 0x7ff
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tbl = self.l2.get((l0_idx, l1_idx), None)
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if not tbl:
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tbl = self.memalign(self.PAGESIZE, self.PAGESIZE)
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self.l2[(l0_idx, l1_idx)] = tbl
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p.write64(self.l1[l0_idx] + 8*l1_idx, self.make_table_pte(tbl))
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p.write64(tbl + 8*l2_idx, pte)
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def map(self, vaddr, paddr, sz, access_bits):
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assert sz % 0x2000000 == 0
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assert vaddr % 0x2000000 == 0
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assert paddr % 0x2000000 == 0
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assert access_bits <= 0b1111
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while sz > 0:
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self.map_page(vaddr, paddr, access_bits)
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sz -= 0x2000000
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vaddr += 0x2000000
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paddr += 0x2000000
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def build_and_write_code(heap, code):
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page = heap.memalign(0x4000, 0x4000)
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compiled = asm.ARMAsm(code, page).data
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iface.writemem(page, compiled)
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p.dc_cvau(page, len(compiled))
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p.ic_ivau(page, len(compiled))
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return page
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def setup_exception_vectors(heap, gxf=False):
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if gxf:
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elr = "S3_6_C15_C10_6"
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eret = ".long 0x201400"
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indicator = 0xf2
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else:
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elr = "ELR_EL1"
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eret = "eret"
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indicator = 0xf0
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return build_and_write_code(heap, """
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.rept 16
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b 1f
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.align 7
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.endr
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1:
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// store that we failed
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mov x10, 0x{indicator:x}
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// move PC two instruction further and clear 0xf0 0000 0000 to
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// make sure we end up in the r-x mapping either way and don't
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// repeat the instruction that just faulted
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// we skip the second instruction since that one is used to
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// indicate success
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ldr x11, =0x0fffffffff
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mrs x12, {elr}
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add x12, x12, #8
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and x12, x12, x11
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msr {elr}, x12
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isb
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{eret}
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""".format(eret=eret, elr=elr, indicator=indicator))
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print("Setting up..")
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pagetable = ARMPageTable(u.memalign, u.free)
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pagetable.map(0x800000000, 0x800000000, 0xc00000000, 0)
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pagetable.map(0xf800000000, 0x800000000, 0xc00000000, 1)
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el2_vectors = setup_exception_vectors(u.heap, gxf=False)
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gl2_vectors = setup_exception_vectors(u.heap, gxf=True)
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probe_page = build_and_write_code(u.heap, "mov x10, 0x80\nret\nret\nret\n")
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probe_page_vaddr = probe_page | 0xf000000000
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code_page = build_and_write_code(u.heap, """
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#define SPRR_PERM_EL0 S3_6_C15_C1_5
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#define SPRR_PERM_EL1 S3_6_C15_C1_6
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#define SPRR_PERM_EL2 S3_6_C15_C1_7
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#define GXF_CONFIG_EL2 s3_6_c15_c1_2
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#define GXF_ENTER_EL2 s3_6_c15_c8_1
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#define GXF_ABORT_EL2 s3_6_c15_c8_2
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#define MPIDR_GL2 S3_6_C15_C10_1
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#define VBAR_GL2 S3_6_C15_C10_2
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#define SPSR_GL2 S3_6_C15_C10_3
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#define ELR_GL2 S3_6_C15_C10_6
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#define FAR_GL2 S3_6_C15_C10_7
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#define genter .long 0x00201420
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#define gexit .long 0x201400
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// just store everything since i'm too lazy to think about
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// register assignments
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str x30, [sp, #-16]!
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stp x28, x29, [sp, #-16]!
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stp x26, x27, [sp, #-16]!
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stp x24, x25, [sp, #-16]!
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stp x22, x23, [sp, #-16]!
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stp x20, x21, [sp, #-16]!
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stp x18, x19, [sp, #-16]!
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stp x16, x17, [sp, #-16]!
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stp x14, x15, [sp, #-16]!
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stp x12, x13, [sp, #-16]!
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stp x10, x11, [sp, #-16]!
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stp x8, x9, [sp, #-16]!
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stp x6, x7, [sp, #-16]!
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stp x4, x5, [sp, #-16]!
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stp x2, x3, [sp, #-16]!
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stp x0, x1, [sp, #-16]!
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mov x20, x0 // store SPRR value for later
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mov x21, 0 // clear result
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// setup exception vectors
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ldr x0, =0x{vectors:x}
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msr VBAR_EL2, x0
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isb
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// prepare MMU
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ldr x0, =0x0400ff
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msr MAIR_EL1, x0
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ldr x0, =0x27510b510
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msr TCR_EL1, x0
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ldr x0, =0x{ttbr:x}
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msr TTBR0_EL2, x0
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// enable SPPR
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mov x0, 1
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msr s3_6_c15_c1_0, x0
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msr s3_6_c15_c1_3, xzr
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isb
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// clear all SPPR registers
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// (note that reads from/writes to EL1 will be redirected to EL2 anyway)
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ldr x0, =0
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msr SPRR_PERM_EL0, x0
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msr SPRR_PERM_EL1, x0
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msr SPRR_PERM_EL2, x0
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msr s3_6_c15_c1_3, x0
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// setup SPPR_EL2
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msr SPRR_PERM_EL2, x20
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isb
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dsb ishst
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tlbi vmalle1is
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dsb ish
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isb
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msr s3_6_c15_c1_3, xzr
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isb
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// enable MMU
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ldr x1, =0x1005
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mrs x0, SCTLR_EL1
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mov x3, x0
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orr x0, x0, x1
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msr SCTLR_EL1, x0
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isb
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// configure and enable GXF
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mov x0, 1
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msr GXF_CONFIG_EL2, x0
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isb
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ldr x0, =gxf_entry
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msr GXF_ENTER_EL2, x0
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ldr x0, =gxf_abort
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msr GXF_ABORT_EL2, x0
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isb
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// test GXF access
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genter
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// test execute access
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ldr x1, =0x{probe_page:x}
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mov x10, 0
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blr x1
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lsl x21, x21, #8
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orr x21, x21, x10
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// test read access
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ldr x1, =0x{probe_page:x}
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mov x10, 0
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ldr x1, [x1]
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mov x10, 0x80
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lsl x21, x21, #8
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orr x21, x21, x10
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// test write access
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ldr x1, =0x{probe_page:x}
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add x1, x1, 0x20
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mov x10, 0
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str x1, [x1]
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mov x10, 0x80
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lsl x21, x21, #8
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orr x21, x21, x10
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// disable MMU again
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dsb ish
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isb
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msr SCTLR_EL1, x3
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isb
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mov x0, 0
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msr GXF_CONFIG_EL2, x0
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msr s3_6_c15_c1_0, x0
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mov x0, x21
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// restore everything except for x0
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add sp, sp, #8
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ldr x1, [sp], #8
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ldp x2, x3, [sp], #16
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ldp x4, x5, [sp], #16
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ldp x6, x7, [sp], #16
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ldp x8, x9, [sp], #16
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ldp x10, x11, [sp], #16
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ldp x12, x13, [sp], #16
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ldp x14, x15, [sp], #16
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ldp x16, x17, [sp], #16
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ldp x18, x19, [sp], #16
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ldp x20, x21, [sp], #16
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ldp x22, x23, [sp], #16
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ldp x24, x25, [sp], #16
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ldp x26, x27, [sp], #16
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ldp x28, x29, [sp], #16
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ldr x30, [sp], #16
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ret
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gxf_entry:
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// setup GL exception vectors
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ldr x0, =0x{gxf_vectors:x}
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msr VBAR_GL2, x0
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isb
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// we might double fault -> store state here
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mrs x14, S3_6_C15_C10_3
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mrs x15, S3_6_C15_C10_4
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mrs x16, S3_6_C15_C10_5
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mrs x17, ELR_GL2
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mrs x18, FAR_GL2
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// test execute access
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ldr x1, =0x{probe_page:x}
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mov x10, 0
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blr x1
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lsl x21, x21, #8
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orr x21, x21, x10
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// test read access
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ldr x1, =0x{probe_page:x}
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mov x10, 0
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ldr x1, [x1]
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mov x10, 0x80
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lsl x21, x21, #8
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orr x21, x21, x10
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// test write access
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ldr x1, =0x{probe_page:x}
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add x1, x1, #0x20
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mov x10, 0
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str x1, [x1]
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mov x10, 0x80
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lsl x21, x21, #8
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orr x21, x21, x10
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// restore state in case we faulted in here
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msr S3_6_C15_C10_3, x14
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msr S3_6_C15_C10_4, x15
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msr S3_6_C15_C10_5, x16
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msr ELR_GL2, x17
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msr FAR_GL2, x18
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isb
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gexit
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gxf_abort:
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// store that we failed
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mov x10, 0xf1
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// move PC two instruction further and clear 0xf0 0000 0000 to
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// make sure we end up in the r-x mapping either way and don't
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// repeat the instruction that just faulted
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// we skip the second instruction since that one is used to
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// indicate success
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ldr x11, =0x0fffffffff
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mrs x12, ELR_GL2
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add x12, x12, #8
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and x12, x12, x11
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msr ELR_GL2, x12
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isb
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gexit
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""".format(ttbr=pagetable.l0, vectors=el2_vectors, probe_page=probe_page_vaddr, gxf_vectors=gl2_vectors))
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print("Running code now...")
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for i in range(0x10):
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sprr_val = 0x5 | ((i & 0xf) << 4)
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ret = p.smp_call_sync(1, code_page, sprr_val)
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glret = ret >> 24
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glx = 'x' if (glret >> 16) & 0xff == 0x80 else '-'
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glr = 'r' if (glret >> 8) & 0xff == 0x80 else '-'
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glw = 'w' if glret & 0xff == 0x80 else '-'
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x = 'x' if (ret >> 16) & 0xff == 0x80 else '-'
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r = 'r' if (ret >> 8) & 0xff == 0x80 else '-'
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w = 'w' if ret & 0xff == 0x80 else '-'
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print("SPRR: {0:04b} result: {1:x} GL: {2}{3}{4} EL: {5}{6}{7}".format(
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i, ret, glr, glw, glx, r, w, x))
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