559 lines
16 KiB
Python
Executable file
559 lines
16 KiB
Python
Executable file
#!/usr/bin/python
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#
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# this tool is used to generate the syscall assmbler templates
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# to be placed into arch-x86/syscalls, as well as the content
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# of arch-x86/linux/_syscalls.h
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#
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import sys, os.path, glob, re, commands, filecmp, shutil
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from bionic_utils import *
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# set this to 1 if you want to generate thumb stubs
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gen_thumb_stubs = 0
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# set this to 1 if you want to generate ARM EABI stubs
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gen_eabi_stubs = 1
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# get the root Bionic directory, simply this script's dirname
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#
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bionic_root = find_bionic_root()
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if not bionic_root:
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print "could not find the Bionic root directory. aborting"
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sys.exit(1)
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if bionic_root[-1] != '/':
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bionic_root += "/"
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print "bionic_root is %s" % bionic_root
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# temp directory where we store all intermediate files
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bionic_temp = "/tmp/bionic_gensyscalls/"
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# all architectures, update as you see fit
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all_archs = [ "arm", "x86" ]
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def make_dir( path ):
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if not os.path.exists(path):
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parent = os.path.dirname(path)
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if parent:
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make_dir(parent)
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os.mkdir(path)
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def create_file( relpath ):
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dir = os.path.dirname( bionic_temp + relpath )
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make_dir(dir)
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return open( bionic_temp + relpath, "w" )
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# x86 assembler templates for each syscall stub
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#
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x86_header = """/* autogenerated by gensyscalls.py */
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#include <sys/linux-syscalls.h>
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.text
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.type %(fname)s, @function
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.globl %(fname)s
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.align 4
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%(fname)s:
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"""
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x86_registers = [ "%ebx", "%ecx", "%edx", "%esi", "%edi", "%ebp" ]
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x86_call = """ movl $%(idname)s, %%eax
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int $0x80
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cmpl $-129, %%eax
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jb 1f
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negl %%eax
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pushl %%eax
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call __set_errno
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addl $4, %%esp
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orl $-1, %%eax
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1:
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"""
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x86_return = """ ret
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"""
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# ARM assembler templates for each syscall stub
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#
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arm_header = """/* autogenerated by gensyscalls.py */
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#include <machine/asm.h>
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#include <sys/linux-syscalls.h>
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ENTRY(%(fname)s)
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"""
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arm_footer = """\
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END(%(fname)s)
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"""
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arm_call_default = arm_header + """\
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swi #%(idname)s
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movs r0, r0
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bxpl lr
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b __set_syscall_errno
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""" + arm_footer
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arm_call_long = arm_header + """\
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.save {r4, r5, lr}
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stmfd sp!, {r4, r5, lr}
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ldr r4, [sp, #12]
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ldr r5, [sp, #16]
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swi # %(idname)s
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ldmfd sp!, {r4, r5, lr}
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movs r0, r0
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bxpl lr
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b __set_syscall_errno
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""" + arm_footer
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arm_eabi_call_default = arm_header + """\
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.save {r4, r7}
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stmfd sp!, {r4, r7}
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ldr r7, =%(idname)s
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swi #0
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ldmfd sp!, {r4, r7}
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movs r0, r0
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bxpl lr
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b __set_syscall_errno
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""" + arm_footer
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arm_eabi_call_long = arm_header + """\
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mov ip, sp
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.save {r4, r5, r6, r7}
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stmfd sp!, {r4, r5, r6, r7}
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ldmfd ip, {r4, r5, r6}
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ldr r7, =%(idname)s
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swi #0
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ldmfd sp!, {r4, r5, r6, r7}
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movs r0, r0
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bxpl lr
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b __set_syscall_errno
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""" + arm_footer
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# ARM thumb assembler templates for each syscall stub
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#
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thumb_header = """/* autogenerated by gensyscalls.py */
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.text
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.type %(fname)s, #function
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.globl %(fname)s
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.align 4
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.thumb_func
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.fnstart
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#define __thumb__
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#include <sys/linux-syscalls.h>
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%(fname)s:
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"""
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thumb_call_default = thumb_header + """\
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.save {r7,lr}
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push {r7,lr}
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ldr r7, =%(idname)s
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swi #0
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tst r0, r0
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bmi 1f
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pop {r7,pc}
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1:
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neg r0, r0
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ldr r1, =__set_errno
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blx r1
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pop {r7,pc}
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.fnend
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"""
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thumb_call_long = thumb_header + """\
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.save {r4,r5,r7,lr}
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push {r4,r5,r7,lr}
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ldr r4, [sp,#16]
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ldr r5, [sp,#20]
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ldr r7, =%(idname)s
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swi #0
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tst r0, r0
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bmi 1f
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pop {r4,r5,r7,pc}
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1:
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neg r0, r0
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ldr r1, =__set_errno
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blx r1
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pop {r4,r5,r7,pc}
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.fnend
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"""
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def param_uses_64bits(param):
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"""Returns True iff a syscall parameter description corresponds
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to a 64-bit type."""
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param = param.strip()
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# First, check that the param type begins with one of the known
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# 64-bit types.
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if not ( \
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param.startswith("int64_t") or param.startswith("uint64_t") or \
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param.startswith("loff_t") or param.startswith("off64_t") or \
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param.startswith("long long") or param.startswith("unsigned long long") or
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param.startswith("signed long long") ):
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return False
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# Second, check that there is no pointer type here
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if param.find("*") >= 0:
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return False
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# Ok
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return True
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def count_arm_param_registers(params):
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"""This function is used to count the number of register used
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to pass parameters when invoking a thumb or ARM system call.
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This is because the ARM EABI mandates that 64-bit quantities
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must be passed in an even+odd register pair. So, for example,
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something like:
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foo(int fd, off64_t pos)
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would actually need 4 registers:
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r0 -> int
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r1 -> unused
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r2-r3 -> pos
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"""
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count = 0
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for param in params:
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if param_uses_64bits(param):
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if (count & 1) != 0:
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count += 1
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count += 2
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else:
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count += 1
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return count
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def count_generic_param_registers(params):
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count = 0
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for param in params:
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if param_uses_64bits(param):
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count += 2
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else:
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count += 1
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return count
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class State:
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def __init__(self):
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self.old_stubs = []
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self.new_stubs = []
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self.other_files = []
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self.syscalls = []
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def x86_genstub(self, fname, numparams, idname):
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t = { "fname" : fname,
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"idname" : idname }
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result = x86_header % t
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stack_bias = 4
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for r in range(numparams):
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result += " pushl " + x86_registers[r] + "\n"
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stack_bias += 4
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for r in range(numparams):
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result += " mov %d(%%esp), %s" % (stack_bias+r*4, x86_registers[r]) + "\n"
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result += x86_call % t
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for r in range(numparams):
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result += " popl " + x86_registers[numparams-r-1] + "\n"
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result += x86_return
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return result
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def x86_genstub_cid(self, fname, numparams, idname, cid):
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# We'll ignore numparams here because in reality, if there is a
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# dispatch call (like a socketcall syscall) there are actually
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# only 2 arguments to the syscall and 2 regs we have to save:
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# %ebx <--- Argument 1 - The call id of the needed vectored
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# syscall (socket, bind, recv, etc)
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# %ecx <--- Argument 2 - Pointer to the rest of the arguments
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# from the original function called (socket())
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t = { "fname" : fname,
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"idname" : idname }
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result = x86_header % t
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stack_bias = 4
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# save the regs we need
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result += " pushl %ebx" + "\n"
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stack_bias += 4
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result += " pushl %ecx" + "\n"
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stack_bias += 4
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# set the call id (%ebx)
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result += " mov $%d, %%ebx" % (cid) + "\n"
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# set the pointer to the rest of the args into %ecx
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result += " mov %esp, %ecx" + "\n"
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result += " addl $%d, %%ecx" % (stack_bias) + "\n"
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# now do the syscall code itself
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result += x86_call % t
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# now restore the saved regs
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result += " popl %ecx" + "\n"
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result += " popl %ebx" + "\n"
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# epilog
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result += x86_return
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return result
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def arm_genstub(self,fname, flags, idname):
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t = { "fname" : fname,
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"idname" : idname }
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if flags:
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numargs = int(flags)
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if numargs > 4:
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return arm_call_long % t
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return arm_call_default % t
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def arm_eabi_genstub(self,fname, flags, idname):
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t = { "fname" : fname,
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"idname" : idname }
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if flags:
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numargs = int(flags)
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if numargs > 4:
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return arm_eabi_call_long % t
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return arm_eabi_call_default % t
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def thumb_genstub(self,fname, flags, idname):
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t = { "fname" : fname,
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"idname" : idname }
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if flags:
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numargs = int(flags)
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if numargs > 4:
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return thumb_call_long % t
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return thumb_call_default % t
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def superh_genstub(self, fname, flags, idname):
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numargs = int(flags)
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t = { "fname" : fname,
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"idname" : idname,
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"numargs" : numargs }
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superh_call = superh_header
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if flags:
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if numargs == 5:
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superh_call += superh_5args_header
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if numargs == 6:
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superh_call += superh_6args_header
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if numargs == 7:
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superh_call += superh_7args_header
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superh_call += superh_call_default
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return superh_call % t
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def process_file(self,input):
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parser = SysCallsTxtParser()
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parser.parse_file(input)
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self.syscalls = parser.syscalls
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parser = None
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for t in self.syscalls:
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syscall_func = t["func"]
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syscall_params = t["params"]
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syscall_name = t["name"]
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if t["id"] >= 0:
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num_regs = count_arm_param_registers(syscall_params)
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if gen_thumb_stubs:
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t["asm-thumb"] = self.thumb_genstub(syscall_func,num_regs,"__NR_"+syscall_name)
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else:
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if gen_eabi_stubs:
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t["asm-arm"] = self.arm_eabi_genstub(syscall_func,num_regs,"__NR_"+syscall_name)
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else:
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t["asm-arm"] = self.arm_genstub(syscall_func,num_regs,"__NR_"+syscall_name)
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if t["id2"] >= 0:
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num_regs = count_generic_param_registers(syscall_params)
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if t["cid"] >= 0:
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t["asm-x86"] = self.x86_genstub_cid(syscall_func, num_regs, "__NR_"+syscall_name, t["cid"])
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else:
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t["asm-x86"] = self.x86_genstub(syscall_func, num_regs, "__NR_"+syscall_name)
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elif t["cid"] >= 0:
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E("cid for dispatch syscalls is only supported for x86 in "
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"'%s'" % syscall_name)
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return
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def gen_NR_syscall(self,fp,name,id):
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fp.write( "#define __NR_%-25s (__NR_SYSCALL_BASE + %d)\n" % (name,id) )
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# now dump the content of linux/_syscalls.h
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def gen_linux_syscalls_h(self):
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path = "include/sys/linux-syscalls.h"
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D( "generating "+path )
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fp = create_file( path )
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fp.write( "/* auto-generated by gensyscalls.py, do not touch */\n" )
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fp.write( "#ifndef _BIONIC_LINUX_SYSCALLS_H_\n\n" )
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fp.write( "#if !defined __ASM_ARM_UNISTD_H && !defined __ASM_I386_UNISTD_H\n" )
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fp.write( "#if defined __arm__ && !defined __ARM_EABI__ && !defined __thumb__\n" )
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fp.write( " # define __NR_SYSCALL_BASE 0x900000\n" )
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fp.write( " #else\n" )
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fp.write( " # define __NR_SYSCALL_BASE 0\n" )
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fp.write( " #endif\n\n" )
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# first, all common syscalls
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for sc in self.syscalls:
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sc_id = sc["id"]
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sc_id2 = sc["id2"]
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sc_name = sc["name"]
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if sc_id == sc_id2 and sc_id >= 0:
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self.gen_NR_syscall( fp, sc_name, sc_id )
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# now, all arm-specific syscalls
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fp.write( "\n#ifdef __arm__\n" );
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for sc in self.syscalls:
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sc_id = sc["id"]
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sc_id2 = sc["id2"]
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sc_name = sc["name"]
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if sc_id != sc_id2 and sc_id >= 0:
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self.gen_NR_syscall( fp, sc_name, sc_id )
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fp.write( "#endif\n" );
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gen_syscalls = {}
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# finally, all i386-specific syscalls
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fp.write( "\n#ifdef __i386__\n" );
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for sc in self.syscalls:
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sc_id = sc["id"]
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sc_id2 = sc["id2"]
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sc_name = sc["name"]
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if sc_id != sc_id2 and sc_id2 >= 0 and sc_name not in gen_syscalls:
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self.gen_NR_syscall( fp, sc_name, sc_id2 )
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gen_syscalls[sc_name] = True
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fp.write( "#endif\n" );
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fp.write( "\n#endif\n" )
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fp.write( "\n#endif /* _BIONIC_LINUX_SYSCALLS_H_ */\n" );
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fp.close()
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self.other_files.append( path )
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# now dump the contents of syscalls.mk
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def gen_arch_syscalls_mk(self, arch):
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path = "arch-%s/syscalls.mk" % arch
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D( "generating "+path )
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fp = create_file( path )
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fp.write( "# auto-generated by gensyscalls.py, do not touch\n" )
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fp.write( "syscall_src := \n" )
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arch_test = {
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"arm": lambda x: x.has_key("asm-arm") or x.has_key("asm-thumb"),
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"x86": lambda x: x.has_key("asm-x86"),
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}
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for sc in self.syscalls:
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if arch_test[arch](sc):
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fp.write("syscall_src += arch-%s/syscalls/%s.S\n" %
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(arch, sc["func"]))
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fp.close()
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self.other_files.append( path )
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# now generate each syscall stub
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def gen_syscall_stubs(self):
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for sc in self.syscalls:
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if sc.has_key("asm-arm") and 'arm' in all_archs:
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fname = "arch-arm/syscalls/%s.S" % sc["func"]
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D2( ">>> generating "+fname )
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fp = create_file( fname )
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fp.write(sc["asm-arm"])
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fp.close()
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self.new_stubs.append( fname )
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if sc.has_key("asm-thumb") and 'arm' in all_archs:
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fname = "arch-arm/syscalls/%s.S" % sc["func"]
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D2( ">>> generating "+fname )
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fp = create_file( fname )
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fp.write(sc["asm-thumb"])
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fp.close()
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self.new_stubs.append( fname )
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if sc.has_key("asm-x86") and 'x86' in all_archs:
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fname = "arch-x86/syscalls/%s.S" % sc["func"]
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D2( ">>> generating "+fname )
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fp = create_file( fname )
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fp.write(sc["asm-x86"])
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fp.close()
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self.new_stubs.append( fname )
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def regenerate(self):
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D( "scanning for existing architecture-specific stub files" )
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bionic_root_len = len(bionic_root)
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for arch in all_archs:
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arch_path = bionic_root + "arch-" + arch
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D( "scanning " + arch_path )
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files = glob.glob( arch_path + "/syscalls/*.S" )
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for f in files:
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self.old_stubs.append( f[bionic_root_len:] )
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D( "found %d stub files" % len(self.old_stubs) )
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if not os.path.exists( bionic_temp ):
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D( "creating %s" % bionic_temp )
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os.mkdir( bionic_temp )
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# D( "p4 editing source files" )
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# for arch in all_archs:
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# commands.getoutput( "p4 edit " + arch + "/syscalls/*.S " )
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# commands.getoutput( "p4 edit " + arch + "/syscalls.mk" )
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# commands.getoutput( "p4 edit " + bionic_root + "include/sys/linux-syscalls.h" )
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|
|
D( "re-generating stubs and support files" )
|
|
|
|
self.gen_linux_syscalls_h()
|
|
for arch in all_archs:
|
|
self.gen_arch_syscalls_mk(arch)
|
|
self.gen_syscall_stubs()
|
|
|
|
D( "comparing files" )
|
|
adds = []
|
|
edits = []
|
|
|
|
for stub in self.new_stubs + self.other_files:
|
|
if not os.path.exists( bionic_root + stub ):
|
|
# new file, git add it
|
|
D( "new file: " + stub)
|
|
adds.append( bionic_root + stub )
|
|
shutil.copyfile( bionic_temp + stub, bionic_root + stub )
|
|
|
|
elif not filecmp.cmp( bionic_temp + stub, bionic_root + stub ):
|
|
D( "changed file: " + stub)
|
|
edits.append( stub )
|
|
|
|
deletes = []
|
|
for stub in self.old_stubs:
|
|
if not stub in self.new_stubs:
|
|
D( "deleted file: " + stub)
|
|
deletes.append( bionic_root + stub )
|
|
|
|
|
|
if adds:
|
|
commands.getoutput("git add " + " ".join(adds))
|
|
if deletes:
|
|
commands.getoutput("git rm " + " ".join(deletes))
|
|
if edits:
|
|
for file in edits:
|
|
shutil.copyfile( bionic_temp + file, bionic_root + file )
|
|
commands.getoutput("git add " +
|
|
" ".join((bionic_root + file) for file in edits))
|
|
|
|
commands.getoutput("git add %s%s" % (bionic_root,"SYSCALLS.TXT"))
|
|
|
|
if (not adds) and (not deletes) and (not edits):
|
|
D("no changes detected!")
|
|
else:
|
|
D("ready to go!!")
|
|
|
|
D_setlevel(1)
|
|
|
|
state = State()
|
|
state.process_file(bionic_root+"SYSCALLS.TXT")
|
|
state.regenerate()
|