306 lines
10 KiB
Python
Executable File
306 lines
10 KiB
Python
Executable File
#!/usr/bin/env python3
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#
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# Copyright (c) 2017 Intel Corporation
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# Copyright (c) 2018 Foundries.io
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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import argparse
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import struct
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import sys
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import os
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from elftools.elf.elffile import ELFFile
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from elftools.elf.sections import SymbolTableSection
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ISR_FLAG_DIRECT = (1 << 0)
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# The below few hardware independent magic numbers represent various
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# levels of interrupts in a multi-level interrupt system.
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# 0x000000FF - represents the 1st level (i.e. the interrupts
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# that directly go to the processor).
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# 0x0000FF00 - represents the 2nd level (i.e. the interrupts funnel
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# into 1 line which then goes into the 1st level)
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# 0x00FF0000 - represents the 3rd level (i.e. the interrupts funnel
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# into 1 line which then goes into the 2nd level)
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FIRST_LVL_INTERRUPTS = 0x000000FF
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SECND_LVL_INTERRUPTS = 0x0000FF00
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THIRD_LVL_INTERRUPTS = 0x00FF0000
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def debug(text):
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if args.debug:
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sys.stdout.write(os.path.basename(sys.argv[0]) + ": " + text + "\n")
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def error(text):
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sys.stderr.write(os.path.basename(sys.argv[0]) + ": " + text + "\n")
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raise Exception()
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def endian_prefix():
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if args.big_endian:
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return ">"
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else:
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return "<"
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def read_intlist(intlist_path):
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"""read a binary file containing the contents of the kernel's .intList
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section. This is an instance of a header created by
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include/linker/intlist.ld:
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struct {
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u32_t num_vectors; <- typically CONFIG_NUM_IRQS
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struct _isr_list isrs[]; <- Usually of smaller size than num_vectors
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}
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Followed by instances of struct _isr_list created by IRQ_CONNECT()
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calls:
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struct _isr_list {
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/** IRQ line number */
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s32_t irq;
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/** Flags for this IRQ, see ISR_FLAG_* definitions */
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s32_t flags;
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/** ISR to call */
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void *func;
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/** Parameter for non-direct IRQs */
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void *param;
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};
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"""
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intlist = {}
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prefix = endian_prefix()
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intlist_header_fmt = prefix + "II"
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intlist_entry_fmt = prefix + "iiII"
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with open(intlist_path, "rb") as fp:
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intdata = fp.read()
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header_sz = struct.calcsize(intlist_header_fmt)
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header = struct.unpack_from(intlist_header_fmt, intdata, 0)
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intdata = intdata[header_sz:]
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debug(str(header))
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intlist["num_vectors"] = header[0]
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intlist["offset"] = header[1]
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intlist["interrupts"] = [i for i in
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struct.iter_unpack(intlist_entry_fmt, intdata)]
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debug("Configured interrupt routing")
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debug("handler irq flags param")
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debug("--------------------------")
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for irq in intlist["interrupts"]:
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debug("{0:<10} {1:<3} {2:<3} {3}".format(
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hex(irq[2]), irq[0], irq[1], hex(irq[3])))
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return intlist
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def parse_args():
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global args
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parser = argparse.ArgumentParser(description = __doc__,
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formatter_class = argparse.RawDescriptionHelpFormatter)
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parser.add_argument("-e", "--big-endian", action="store_true",
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help="Target encodes data in big-endian format (little endian is "
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"the default)")
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parser.add_argument("-d", "--debug", action="store_true",
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help="Print additional debugging information")
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parser.add_argument("-o", "--output-source", required=True,
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help="Output source file")
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parser.add_argument("-k", "--kernel", required=True,
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help="Zephyr kernel image")
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parser.add_argument("-s", "--sw-isr-table", action="store_true",
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help="Generate SW ISR table")
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parser.add_argument("-V", "--vector-table", action="store_true",
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help="Generate vector table")
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parser.add_argument("-i", "--intlist", required=True,
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help="Zephyr intlist binary for intList extraction")
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args = parser.parse_args()
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source_header = """
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/* AUTO-GENERATED by gen_isr_tables.py, do not edit! */
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#include <toolchain.h>
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#include <linker/sections.h>
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#include <sw_isr_table.h>
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#include <arch/cpu.h>
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#if defined(CONFIG_GEN_SW_ISR_TABLE) && defined(CONFIG_GEN_IRQ_VECTOR_TABLE)
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#define ISR_WRAPPER ((u32_t)&_isr_wrapper)
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#else
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#define ISR_WRAPPER NULL
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#endif
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"""
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def write_source_file(fp, vt, swt, intlist, syms):
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fp.write(source_header)
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nv = intlist["num_vectors"]
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if vt:
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fp.write("u32_t __irq_vector_table _irq_vector_table[%d] = {\n" % nv)
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for i in range(nv):
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fp.write("\t{},\n".format(vt[i]))
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fp.write("};\n")
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if not swt:
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return
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fp.write("struct _isr_table_entry __sw_isr_table _sw_isr_table[%d] = {\n"
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% nv)
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level2_offset = syms.get("CONFIG_2ND_LVL_ISR_TBL_OFFSET")
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level3_offset = syms.get("CONFIG_3RD_LVL_ISR_TBL_OFFSET")
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for i in range(nv):
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param, func = swt[i]
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if type(func) is int:
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func_as_string = "{0:#x}".format(func)
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else:
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func_as_string = func
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if level2_offset is not None and i == level2_offset:
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fp.write("\t/* Level 2 interrupts start here (offset: {}) */\n".
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format(level2_offset))
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if level3_offset is not None and i == level3_offset:
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fp.write("\t/* Level 3 interrupts start here (offset: {}) */\n".
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format(level3_offset))
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fp.write("\t{{(void *){0:#x}, (void *){1}}},\n".format(param, func_as_string))
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fp.write("};\n")
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def get_symbols(obj):
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for section in obj.iter_sections():
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if isinstance(section, SymbolTableSection):
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return {sym.name: sym.entry.st_value
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for sym in section.iter_symbols()}
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error("Could not find symbol table")
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def getindex(irq, irq_aggregator_pos):
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try:
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return irq_aggregator_pos.index(irq)
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except ValueError:
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error("IRQ {} not present in parent offsets ({}). ".
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format(irq, irq_aggregator_pos) +
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" Recheck interrupt configuration.")
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def main():
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parse_args()
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with open(args.kernel, "rb") as fp:
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kernel = ELFFile(fp)
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syms = get_symbols(kernel)
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if "CONFIG_MULTI_LEVEL_INTERRUPTS" in syms:
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max_irq_per = syms["CONFIG_MAX_IRQ_PER_AGGREGATOR"]
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if "CONFIG_2ND_LEVEL_INTERRUPTS" in syms:
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num_aggregators = syms["CONFIG_NUM_2ND_LEVEL_AGGREGATORS"]
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irq2_baseoffset = syms["CONFIG_2ND_LVL_ISR_TBL_OFFSET"]
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list_2nd_lvl_offsets = [syms['CONFIG_2ND_LVL_INTR_{}_OFFSET'.
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format(str(i).zfill(2))] for i in
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range(num_aggregators)]
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debug('2nd level offsets: {}'.format(list_2nd_lvl_offsets))
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if "CONFIG_3RD_LEVEL_INTERRUPTS" in syms:
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num_aggregators = syms["CONFIG_NUM_3RD_LEVEL_AGGREGATORS"]
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irq3_baseoffset = syms["CONFIG_3RD_LVL_ISR_TBL_OFFSET"]
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list_3rd_lvl_offsets = [syms['CONFIG_3RD_LVL_INTR_{}_OFFSET'.
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format(str(i).zfill(2))] for i in
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range(num_aggregators)]
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debug('3rd level offsets: {}'.format(list_3rd_lvl_offsets))
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intlist = read_intlist(args.intlist)
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nvec = intlist["num_vectors"]
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offset = intlist["offset"]
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prefix = endian_prefix()
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spurious_handler = "&_irq_spurious"
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sw_irq_handler = "ISR_WRAPPER"
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debug('offset is ' + str(offset))
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debug('num_vectors is ' + str(nvec))
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# Set default entries in both tables
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if args.sw_isr_table:
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# All vectors just jump to the common sw_irq_handler. If some entries
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# are used for direct interrupts, they will be replaced later.
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if args.vector_table:
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vt = [sw_irq_handler for i in range(nvec)]
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else:
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vt = None
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# Default to spurious interrupt handler. Configured interrupts
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# will replace these entries.
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swt = [(0, spurious_handler) for i in range(nvec)]
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else:
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if args.vector_table:
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vt = [spurious_handler for i in range(nvec)]
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else:
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error("one or both of -s or -V needs to be specified on command line")
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swt = None
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for irq, flags, func, param in intlist["interrupts"]:
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if (flags & ISR_FLAG_DIRECT):
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if (param != 0):
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error("Direct irq %d declared, but has non-NULL parameter"
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% irq)
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vt[irq - offset] = func
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else:
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# Regular interrupt
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if not swt:
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error("Regular Interrupt %d declared with parameter 0x%x "
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"but no SW ISR_TABLE in use"
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% (irq, param))
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if not "CONFIG_MULTI_LEVEL_INTERRUPTS" in syms:
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swt[irq - offset] = (param, func)
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else:
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# Figure out third level interrupt position
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debug('IRQ = ' + hex(irq))
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irq3 = (irq & THIRD_LVL_INTERRUPTS) >> 16
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irq2 = (irq & SECND_LVL_INTERRUPTS) >> 8
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irq1 = (irq & FIRST_LVL_INTERRUPTS)
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if irq3:
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irq_parent = irq2
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list_index = getindex(irq_parent, list_3rd_lvl_offsets)
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irq3_pos = irq3_baseoffset + max_irq_per*list_index + irq3 - 1
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debug('IRQ_level = 3')
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debug('IRQ_Indx = ' + str(irq3))
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debug('IRQ_Pos = ' + str(irq3_pos))
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swt[irq3_pos - offset] = (param, func)
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# Figure out second level interrupt position
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if irq2:
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irq_parent = irq1
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list_index = getindex(irq_parent, list_2nd_lvl_offsets)
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irq2_pos = irq2_baseoffset + max_irq_per*list_index + irq2 - 1
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debug('IRQ_level = 2')
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debug('IRQ_Indx = ' + str(irq2))
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debug('IRQ_Pos = ' + str(irq2_pos))
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swt[irq2_pos - offset] = (param, func)
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# Figure out first level interrupt position
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if not irq3 and not irq2:
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debug('IRQ_level = 1')
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debug('IRQ_Indx = ' + str(irq1))
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debug('IRQ_Pos = ' + str(irq1))
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swt[irq1 - offset] = (param, func)
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with open(args.output_source, "w") as fp:
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write_source_file(fp, vt, swt, intlist, syms)
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if __name__ == "__main__":
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main()
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