Merge "Refactor the syscall generation script."
This commit is contained in:
Elliott Hughes
Gerrit Code Review
commit
5d06718cd3
1 changed files with 185 additions and 179 deletions
|
|
@ -23,6 +23,7 @@ def make_dir(path):
|
|||
make_dir(parent)
|
||||
os.mkdir(path)
|
||||
|
||||
|
||||
def create_file(relpath):
|
||||
dir = os.path.dirname(bionic_temp + relpath)
|
||||
make_dir(dir)
|
||||
|
|
@ -34,21 +35,85 @@ syscall_stub_header = """/* autogenerated by gensyscalls.py */
|
|||
#include <linux/err.h>
|
||||
#include <machine/asm.h>
|
||||
|
||||
ENTRY(%(fname)s)
|
||||
ENTRY(%(func)s)
|
||||
"""
|
||||
|
||||
|
||||
function_alias = """
|
||||
.globl _C_LABEL(%(alias)s)
|
||||
.equ _C_LABEL(%(alias)s), _C_LABEL(%(fname)s)
|
||||
.equ _C_LABEL(%(alias)s), _C_LABEL(%(func)s)
|
||||
"""
|
||||
|
||||
|
||||
#
|
||||
# ARM assembler templates for each syscall stub
|
||||
#
|
||||
|
||||
arm_eabi_call_default = syscall_stub_header + """\
|
||||
mov ip, r7
|
||||
ldr r7, =%(__NR_name)s
|
||||
swi #0
|
||||
mov r7, ip
|
||||
cmn r0, #(MAX_ERRNO + 1)
|
||||
bxls lr
|
||||
neg r0, r0
|
||||
b __set_errno
|
||||
END(%(func)s)
|
||||
"""
|
||||
|
||||
arm_eabi_call_long = syscall_stub_header + """\
|
||||
mov ip, sp
|
||||
.save {r4, r5, r6, r7}
|
||||
stmfd sp!, {r4, r5, r6, r7}
|
||||
ldmfd ip, {r4, r5, r6}
|
||||
ldr r7, =%(__NR_name)s
|
||||
swi #0
|
||||
ldmfd sp!, {r4, r5, r6, r7}
|
||||
cmn r0, #(MAX_ERRNO + 1)
|
||||
bxls lr
|
||||
neg r0, r0
|
||||
b __set_errno
|
||||
END(%(func)s)
|
||||
"""
|
||||
|
||||
|
||||
#
|
||||
# MIPS assembler templates for each syscall stub
|
||||
#
|
||||
|
||||
mips_call = """/* autogenerated by gensyscalls.py */
|
||||
#include <asm/unistd.h>
|
||||
.text
|
||||
.globl %(func)s
|
||||
.align 4
|
||||
.ent %(func)s
|
||||
|
||||
%(func)s:
|
||||
.set noreorder
|
||||
.cpload $t9
|
||||
li $v0, %(__NR_name)s
|
||||
syscall
|
||||
bnez $a3, 1f
|
||||
move $a0, $v0
|
||||
j $ra
|
||||
nop
|
||||
1:
|
||||
la $t9,__set_errno
|
||||
j $t9
|
||||
nop
|
||||
.set reorder
|
||||
.end %(func)s
|
||||
"""
|
||||
|
||||
|
||||
#
|
||||
# x86 assembler templates for each syscall stub
|
||||
#
|
||||
|
||||
x86_registers = [ "%ebx", "%ecx", "%edx", "%esi", "%edi", "%ebp" ]
|
||||
|
||||
x86_call = """ movl $%(idname)s, %%eax
|
||||
x86_call = """\
|
||||
movl $%(__NR_name)s, %%eax
|
||||
int $0x80
|
||||
cmpl $-MAX_ERRNO, %%eax
|
||||
jb 1f
|
||||
|
|
@ -60,15 +125,18 @@ x86_call = """ movl $%(idname)s, %%eax
|
|||
1:
|
||||
"""
|
||||
|
||||
x86_return = """ ret
|
||||
END(%(fname)s)
|
||||
x86_return = """\
|
||||
ret
|
||||
END(%(func)s)
|
||||
"""
|
||||
|
||||
|
||||
#
|
||||
# x86_64 assembler templates for each syscall stub
|
||||
#
|
||||
|
||||
x86_64_call = """ movl $%(idname)s, %%eax
|
||||
x86_64_call = """\
|
||||
movl $%(__NR_name)s, %%eax
|
||||
syscall
|
||||
cmpq $-MAX_ERRNO, %%rax
|
||||
jb 1f
|
||||
|
|
@ -78,67 +146,9 @@ x86_64_call = """ movl $%(idname)s, %%eax
|
|||
orq $-1, %%rax
|
||||
1:
|
||||
ret
|
||||
END(%(fname)s)
|
||||
END(%(func)s)
|
||||
"""
|
||||
|
||||
#
|
||||
# ARM assembler templates for each syscall stub
|
||||
#
|
||||
|
||||
arm_eabi_call_default = syscall_stub_header + """\
|
||||
mov ip, r7
|
||||
ldr r7, =%(idname)s
|
||||
swi #0
|
||||
mov r7, ip
|
||||
cmn r0, #(MAX_ERRNO + 1)
|
||||
bxls lr
|
||||
neg r0, r0
|
||||
b __set_errno
|
||||
END(%(fname)s)
|
||||
"""
|
||||
|
||||
arm_eabi_call_long = syscall_stub_header + """\
|
||||
mov ip, sp
|
||||
.save {r4, r5, r6, r7}
|
||||
stmfd sp!, {r4, r5, r6, r7}
|
||||
ldmfd ip, {r4, r5, r6}
|
||||
ldr r7, =%(idname)s
|
||||
swi #0
|
||||
ldmfd sp!, {r4, r5, r6, r7}
|
||||
cmn r0, #(MAX_ERRNO + 1)
|
||||
bxls lr
|
||||
neg r0, r0
|
||||
b __set_errno
|
||||
END(%(fname)s)
|
||||
"""
|
||||
|
||||
#
|
||||
# mips assembler templates for each syscall stub
|
||||
#
|
||||
|
||||
mips_call = """/* autogenerated by gensyscalls.py */
|
||||
#include <asm/unistd.h>
|
||||
.text
|
||||
.globl %(fname)s
|
||||
.align 4
|
||||
.ent %(fname)s
|
||||
|
||||
%(fname)s:
|
||||
.set noreorder
|
||||
.cpload $t9
|
||||
li $v0, %(idname)s
|
||||
syscall
|
||||
bnez $a3, 1f
|
||||
move $a0, $v0
|
||||
j $ra
|
||||
nop
|
||||
1:
|
||||
la $t9,__set_errno
|
||||
j $t9
|
||||
nop
|
||||
.set reorder
|
||||
.end %(fname)s
|
||||
"""
|
||||
|
||||
def param_uses_64bits(param):
|
||||
"""Returns True iff a syscall parameter description corresponds
|
||||
|
|
@ -160,6 +170,7 @@ def param_uses_64bits(param):
|
|||
# Ok
|
||||
return True
|
||||
|
||||
|
||||
def count_arm_param_registers(params):
|
||||
"""This function is used to count the number of register used
|
||||
to pass parameters when invoking an ARM system call.
|
||||
|
|
@ -184,6 +195,7 @@ def count_arm_param_registers(params):
|
|||
count += 1
|
||||
return count
|
||||
|
||||
|
||||
def count_generic_param_registers(params):
|
||||
count = 0
|
||||
for param in params:
|
||||
|
|
@ -193,12 +205,14 @@ def count_generic_param_registers(params):
|
|||
count += 1
|
||||
return count
|
||||
|
||||
|
||||
def count_generic_param_registers64(params):
|
||||
count = 0
|
||||
for param in params:
|
||||
count += 1
|
||||
return count
|
||||
|
||||
|
||||
# This lets us support regular system calls like __NR_write and also weird
|
||||
# ones like __ARM_NR_cacheflush, where the NR doesn't come at the start.
|
||||
def make__NR_name(name):
|
||||
|
|
@ -207,6 +221,90 @@ def make__NR_name(name):
|
|||
else:
|
||||
return "__NR_%s" % (name)
|
||||
|
||||
|
||||
def add_aliases(stub, syscall):
|
||||
aliases = syscall["aliases"]
|
||||
for alias in aliases:
|
||||
stub += function_alias % { "func" : syscall["func"], "alias" : alias }
|
||||
return stub
|
||||
|
||||
|
||||
def arm_eabi_genstub(syscall):
|
||||
num_regs = count_arm_param_registers(syscall["params"])
|
||||
if num_regs > 4:
|
||||
return arm_eabi_call_long % syscall
|
||||
return arm_eabi_call_default % syscall
|
||||
|
||||
|
||||
def mips_genstub(syscall):
|
||||
return mips_call % syscall
|
||||
|
||||
|
||||
def x86_genstub(syscall):
|
||||
result = syscall_stub_header % syscall
|
||||
stack_bias = 4
|
||||
|
||||
numparams = count_generic_param_registers(syscall["params"])
|
||||
for r in range(numparams):
|
||||
result += " pushl " + x86_registers[r] + "\n"
|
||||
stack_bias += 4
|
||||
|
||||
for r in range(numparams):
|
||||
result += " mov %d(%%esp), %s" % (stack_bias+r*4, x86_registers[r]) + "\n"
|
||||
|
||||
result += x86_call % syscall
|
||||
|
||||
for r in range(numparams):
|
||||
result += " popl " + x86_registers[numparams-r-1] + "\n"
|
||||
|
||||
result += x86_return % syscall
|
||||
return result
|
||||
|
||||
def x86_genstub_socketcall(syscall):
|
||||
# %ebx <--- Argument 1 - The call id of the needed vectored
|
||||
# syscall (socket, bind, recv, etc)
|
||||
# %ecx <--- Argument 2 - Pointer to the rest of the arguments
|
||||
# from the original function called (socket())
|
||||
|
||||
result = syscall_stub_header % syscall
|
||||
stack_bias = 4
|
||||
|
||||
# save the regs we need
|
||||
result += " pushl %ebx" + "\n"
|
||||
stack_bias += 4
|
||||
result += " pushl %ecx" + "\n"
|
||||
stack_bias += 4
|
||||
|
||||
# set the call id (%ebx)
|
||||
result += " mov $%d, %%ebx" % syscall["socketcall_id"] + "\n"
|
||||
|
||||
# set the pointer to the rest of the args into %ecx
|
||||
result += " mov %esp, %ecx" + "\n"
|
||||
result += " addl $%d, %%ecx" % (stack_bias) + "\n"
|
||||
|
||||
# now do the syscall code itself
|
||||
result += x86_call % syscall
|
||||
|
||||
# now restore the saved regs
|
||||
result += " popl %ecx" + "\n"
|
||||
result += " popl %ebx" + "\n"
|
||||
|
||||
# epilog
|
||||
result += x86_return % syscall
|
||||
return result
|
||||
|
||||
|
||||
def x86_64_genstub(syscall):
|
||||
result = syscall_stub_header % syscall
|
||||
num_regs = count_generic_param_registers64(syscall["params"])
|
||||
if (num_regs > 3):
|
||||
# rcx is used as 4th argument. Kernel wants it at r10.
|
||||
result += " movq %rcx, %r10\n"
|
||||
|
||||
result += x86_64_call % syscall
|
||||
return result
|
||||
|
||||
|
||||
class State:
|
||||
def __init__(self):
|
||||
self.old_stubs = []
|
||||
|
|
@ -214,126 +312,34 @@ class State:
|
|||
self.other_files = []
|
||||
self.syscalls = []
|
||||
|
||||
def x86_64_genstub(self, fname, numparams, idname, aliases):
|
||||
t = { "fname" : fname, "idname" : idname }
|
||||
|
||||
result = syscall_stub_header % t
|
||||
# rcx is used as 4th argument. Kernel wants it at r10.
|
||||
if (numparams > 3):
|
||||
result += " movq %rcx, %r10\n"
|
||||
|
||||
result += x86_64_call % t
|
||||
for alias in aliases:
|
||||
t = { "fname" : fname, "alias" : alias }
|
||||
result += function_alias % t
|
||||
|
||||
return result
|
||||
|
||||
def x86_genstub(self, fname, numparams, idname):
|
||||
t = { "fname" : fname,
|
||||
"idname" : idname }
|
||||
|
||||
result = syscall_stub_header % t
|
||||
stack_bias = 4
|
||||
for r in range(numparams):
|
||||
result += " pushl " + x86_registers[r] + "\n"
|
||||
stack_bias += 4
|
||||
|
||||
for r in range(numparams):
|
||||
result += " mov %d(%%esp), %s" % (stack_bias+r*4, x86_registers[r]) + "\n"
|
||||
|
||||
result += x86_call % t
|
||||
|
||||
for r in range(numparams):
|
||||
result += " popl " + x86_registers[numparams-r-1] + "\n"
|
||||
|
||||
result += x86_return % t
|
||||
return result
|
||||
|
||||
def x86_genstub_socketcall(self, fname, idname, socketcall_id):
|
||||
# %ebx <--- Argument 1 - The call id of the needed vectored
|
||||
# syscall (socket, bind, recv, etc)
|
||||
# %ecx <--- Argument 2 - Pointer to the rest of the arguments
|
||||
# from the original function called (socket())
|
||||
t = { "fname" : fname,
|
||||
"idname" : idname }
|
||||
|
||||
result = syscall_stub_header % t
|
||||
stack_bias = 4
|
||||
|
||||
# save the regs we need
|
||||
result += " pushl %ebx" + "\n"
|
||||
stack_bias += 4
|
||||
result += " pushl %ecx" + "\n"
|
||||
stack_bias += 4
|
||||
|
||||
# set the call id (%ebx)
|
||||
result += " mov $%d, %%ebx" % (socketcall_id) + "\n"
|
||||
|
||||
# set the pointer to the rest of the args into %ecx
|
||||
result += " mov %esp, %ecx" + "\n"
|
||||
result += " addl $%d, %%ecx" % (stack_bias) + "\n"
|
||||
|
||||
# now do the syscall code itself
|
||||
result += x86_call % t
|
||||
|
||||
# now restore the saved regs
|
||||
result += " popl %ecx" + "\n"
|
||||
result += " popl %ebx" + "\n"
|
||||
|
||||
# epilog
|
||||
result += x86_return % t
|
||||
return result
|
||||
|
||||
|
||||
def arm_eabi_genstub(self,fname, flags, idname):
|
||||
t = { "fname" : fname,
|
||||
"idname" : idname }
|
||||
if flags:
|
||||
numargs = int(flags)
|
||||
if numargs > 4:
|
||||
return arm_eabi_call_long % t
|
||||
return arm_eabi_call_default % t
|
||||
|
||||
|
||||
def mips_genstub(self,fname, idname):
|
||||
t = { "fname" : fname,
|
||||
"idname" : idname }
|
||||
return mips_call % t
|
||||
|
||||
def process_file(self,input):
|
||||
def process_file(self, input):
|
||||
parser = SysCallsTxtParser()
|
||||
parser.parse_file(input)
|
||||
self.syscalls = parser.syscalls
|
||||
parser = None
|
||||
|
||||
for t in self.syscalls:
|
||||
syscall_func = t["func"]
|
||||
syscall_aliases = t["aliases"]
|
||||
syscall_params = t["params"]
|
||||
syscall_name = t["name"]
|
||||
__NR_name = make__NR_name(t["name"])
|
||||
for syscall in self.syscalls:
|
||||
syscall["__NR_name"] = make__NR_name(syscall["name"])
|
||||
|
||||
if t.has_key("arm"):
|
||||
num_regs = count_arm_param_registers(syscall_params)
|
||||
t["asm-arm"] = self.arm_eabi_genstub(syscall_func, num_regs, __NR_name)
|
||||
if syscall.has_key("arm"):
|
||||
syscall["asm-arm"] = add_aliases(arm_eabi_genstub(syscall), syscall)
|
||||
|
||||
if t.has_key("x86"):
|
||||
num_regs = count_generic_param_registers(syscall_params)
|
||||
if t["socketcall_id"] >= 0:
|
||||
t["asm-x86"] = self.x86_genstub_socketcall(syscall_func, __NR_name, t["socketcall_id"])
|
||||
if syscall.has_key("x86"):
|
||||
if syscall["socketcall_id"] >= 0:
|
||||
syscall["asm-x86"] = add_aliases(x86_genstub_socketcall(syscall), syscall)
|
||||
else:
|
||||
t["asm-x86"] = self.x86_genstub(syscall_func, num_regs, __NR_name)
|
||||
elif t["socketcall_id"] >= 0:
|
||||
syscall["asm-x86"] = add_aliases(x86_genstub(syscall), syscall)
|
||||
elif syscall["socketcall_id"] >= 0:
|
||||
E("socketcall_id for dispatch syscalls is only supported for x86 in '%s'" % t)
|
||||
return
|
||||
|
||||
if t.has_key("mips"):
|
||||
t["asm-mips"] = self.mips_genstub(syscall_func, make__NR_name(syscall_name))
|
||||
if syscall.has_key("mips"):
|
||||
syscall["asm-mips"] = add_aliases(mips_genstub(syscall), syscall)
|
||||
|
||||
if syscall.has_key("x86_64"):
|
||||
syscall["asm-x86_64"] = add_aliases(x86_64_genstub(syscall), syscall)
|
||||
|
||||
if t.has_key("x86_64"):
|
||||
num_regs = count_generic_param_registers64(syscall_params)
|
||||
t["asm-x86_64"] = self.x86_64_genstub(syscall_func, num_regs, __NR_name, syscall_aliases)
|
||||
|
||||
# Scan a Linux kernel asm/unistd.h file containing __NR_* constants
|
||||
# and write out equivalent SYS_* constants for glibc source compatibility.
|
||||
|
|
@ -379,22 +385,22 @@ class State:
|
|||
fp = create_file(path)
|
||||
fp.write("# Auto-generated by gensyscalls.py. Do not edit.\n")
|
||||
fp.write("syscall_src :=\n")
|
||||
for sc in self.syscalls:
|
||||
if sc.has_key("asm-%s" % arch):
|
||||
fp.write("syscall_src += arch-%s/syscalls/%s.S\n" % (arch, sc["func"]))
|
||||
for syscall in self.syscalls:
|
||||
if syscall.has_key("asm-%s" % arch):
|
||||
fp.write("syscall_src += arch-%s/syscalls/%s.S\n" % (arch, syscall["func"]))
|
||||
fp.close()
|
||||
self.other_files.append(path)
|
||||
|
||||
|
||||
# Write each syscall stub.
|
||||
def gen_syscall_stubs(self):
|
||||
for sc in self.syscalls:
|
||||
for syscall in self.syscalls:
|
||||
for arch in all_arches:
|
||||
if sc.has_key("asm-%s" % arch):
|
||||
filename = "arch-%s/syscalls/%s.S" % (arch, sc["func"])
|
||||
if syscall.has_key("asm-%s" % arch):
|
||||
filename = "arch-%s/syscalls/%s.S" % (arch, syscall["func"])
|
||||
D2(">>> generating " + filename)
|
||||
fp = create_file(filename)
|
||||
fp.write(sc["asm-%s" % arch])
|
||||
fp.write(syscall["asm-%s" % arch])
|
||||
fp.close()
|
||||
self.new_stubs.append(filename)
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue