Refactor the syscall generation script.
Primarily so that the new x86_64 alias functionality is now available for all architectures. Change-Id: I9fde59093a1d08de98923f121a6e3d05ec5801d2
This commit is contained in:
Elliott Hughes
parent
d2b6b5f2db
commit
0437f3ff29
@ -23,6 +23,7 @@ def make_dir(path):
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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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@ -34,21 +35,85 @@ syscall_stub_header = """/* autogenerated by gensyscalls.py */
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#include <linux/err.h>
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#include <machine/asm.h>
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ENTRY(%(fname)s)
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ENTRY(%(func)s)
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"""
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function_alias = """
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.globl _C_LABEL(%(alias)s)
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.equ _C_LABEL(%(alias)s), _C_LABEL(%(fname)s)
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.equ _C_LABEL(%(alias)s), _C_LABEL(%(func)s)
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"""
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#
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# ARM assembler templates for each syscall stub
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#
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arm_eabi_call_default = syscall_stub_header + """\
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mov ip, r7
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ldr r7, =%(__NR_name)s
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swi #0
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mov r7, ip
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cmn r0, #(MAX_ERRNO + 1)
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bxls lr
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neg r0, r0
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b __set_errno
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END(%(func)s)
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"""
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arm_eabi_call_long = syscall_stub_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, =%(__NR_name)s
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swi #0
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ldmfd sp!, {r4, r5, r6, r7}
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cmn r0, #(MAX_ERRNO + 1)
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bxls lr
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neg r0, r0
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b __set_errno
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END(%(func)s)
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"""
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#
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# MIPS assembler templates for each syscall stub
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#
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mips_call = """/* autogenerated by gensyscalls.py */
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#include <asm/unistd.h>
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.text
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.globl %(func)s
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.align 4
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.ent %(func)s
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%(func)s:
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.set noreorder
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.cpload $t9
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li $v0, %(__NR_name)s
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syscall
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bnez $a3, 1f
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move $a0, $v0
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j $ra
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nop
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1:
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la $t9,__set_errno
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j $t9
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nop
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.set reorder
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.end %(func)s
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"""
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#
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# x86 assembler templates for each syscall stub
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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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x86_call = """\
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movl $%(__NR_name)s, %%eax
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int $0x80
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cmpl $-MAX_ERRNO, %%eax
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jb 1f
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@ -60,15 +125,18 @@ x86_call = """ movl $%(idname)s, %%eax
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1:
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"""
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x86_return = """ ret
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END(%(fname)s)
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x86_return = """\
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ret
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END(%(func)s)
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"""
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#
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# x86_64 assembler templates for each syscall stub
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#
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x86_64_call = """ movl $%(idname)s, %%eax
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x86_64_call = """\
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movl $%(__NR_name)s, %%eax
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syscall
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cmpq $-MAX_ERRNO, %%rax
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jb 1f
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@ -78,67 +146,9 @@ x86_64_call = """ movl $%(idname)s, %%eax
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orq $-1, %%rax
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1:
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ret
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END(%(fname)s)
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END(%(func)s)
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"""
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#
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# ARM assembler templates for each syscall stub
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#
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arm_eabi_call_default = syscall_stub_header + """\
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mov ip, r7
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ldr r7, =%(idname)s
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swi #0
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mov r7, ip
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cmn r0, #(MAX_ERRNO + 1)
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bxls lr
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neg r0, r0
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b __set_errno
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END(%(fname)s)
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"""
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arm_eabi_call_long = syscall_stub_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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cmn r0, #(MAX_ERRNO + 1)
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bxls lr
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neg r0, r0
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b __set_errno
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END(%(fname)s)
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"""
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#
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# mips assembler templates for each syscall stub
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#
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mips_call = """/* autogenerated by gensyscalls.py */
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#include <asm/unistd.h>
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.text
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.globl %(fname)s
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.align 4
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.ent %(fname)s
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%(fname)s:
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.set noreorder
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.cpload $t9
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li $v0, %(idname)s
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syscall
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bnez $a3, 1f
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move $a0, $v0
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j $ra
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nop
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1:
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la $t9,__set_errno
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j $t9
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nop
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.set reorder
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.end %(fname)s
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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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@ -160,6 +170,7 @@ def param_uses_64bits(param):
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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 an ARM system call.
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@ -184,6 +195,7 @@ def count_arm_param_registers(params):
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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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@ -193,12 +205,14 @@ def count_generic_param_registers(params):
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count += 1
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return count
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def count_generic_param_registers64(params):
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count = 0
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for param in params:
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count += 1
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return count
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# This lets us support regular system calls like __NR_write and also weird
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# ones like __ARM_NR_cacheflush, where the NR doesn't come at the start.
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def make__NR_name(name):
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@ -207,6 +221,90 @@ def make__NR_name(name):
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else:
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return "__NR_%s" % (name)
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def add_aliases(stub, syscall):
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aliases = syscall["aliases"]
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for alias in aliases:
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stub += function_alias % { "func" : syscall["func"], "alias" : alias }
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return stub
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def arm_eabi_genstub(syscall):
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num_regs = count_arm_param_registers(syscall["params"])
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if num_regs > 4:
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return arm_eabi_call_long % syscall
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return arm_eabi_call_default % syscall
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def mips_genstub(syscall):
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return mips_call % syscall
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def x86_genstub(syscall):
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result = syscall_stub_header % syscall
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stack_bias = 4
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numparams = count_generic_param_registers(syscall["params"])
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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 % syscall
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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 % syscall
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return result
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def x86_genstub_socketcall(syscall):
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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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result = syscall_stub_header % syscall
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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" % syscall["socketcall_id"] + "\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 % syscall
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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 % syscall
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return result
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def x86_64_genstub(syscall):
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result = syscall_stub_header % syscall
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num_regs = count_generic_param_registers64(syscall["params"])
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if (num_regs > 3):
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# rcx is used as 4th argument. Kernel wants it at r10.
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result += " movq %rcx, %r10\n"
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result += x86_64_call % syscall
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return result
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class State:
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def __init__(self):
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self.old_stubs = []
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@ -214,126 +312,34 @@ class State:
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self.other_files = []
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self.syscalls = []
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def x86_64_genstub(self, fname, numparams, idname, aliases):
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t = { "fname" : fname, "idname" : idname }
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result = syscall_stub_header % t
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# rcx is used as 4th argument. Kernel wants it at r10.
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if (numparams > 3):
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result += " movq %rcx, %r10\n"
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result += x86_64_call % t
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for alias in aliases:
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t = { "fname" : fname, "alias" : alias }
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result += function_alias % t
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return result
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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 = syscall_stub_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 % t
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return result
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def x86_genstub_socketcall(self, fname, idname, socketcall_id):
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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 = syscall_stub_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" % (socketcall_id) + "\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 % t
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return result
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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 mips_genstub(self,fname, idname):
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t = { "fname" : fname,
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"idname" : idname }
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return mips_call % t
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def process_file(self,input):
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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_aliases = t["aliases"]
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syscall_params = t["params"]
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syscall_name = t["name"]
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__NR_name = make__NR_name(t["name"])
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for syscall in self.syscalls:
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syscall["__NR_name"] = make__NR_name(syscall["name"])
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if t.has_key("arm"):
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num_regs = count_arm_param_registers(syscall_params)
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t["asm-arm"] = self.arm_eabi_genstub(syscall_func, num_regs, __NR_name)
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if syscall.has_key("arm"):
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syscall["asm-arm"] = add_aliases(arm_eabi_genstub(syscall), syscall)
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if t.has_key("x86"):
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num_regs = count_generic_param_registers(syscall_params)
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if t["socketcall_id"] >= 0:
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t["asm-x86"] = self.x86_genstub_socketcall(syscall_func, __NR_name, t["socketcall_id"])
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if syscall.has_key("x86"):
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if syscall["socketcall_id"] >= 0:
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syscall["asm-x86"] = add_aliases(x86_genstub_socketcall(syscall), syscall)
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else:
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t["asm-x86"] = self.x86_genstub(syscall_func, num_regs, __NR_name)
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elif t["socketcall_id"] >= 0:
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syscall["asm-x86"] = add_aliases(x86_genstub(syscall), syscall)
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elif syscall["socketcall_id"] >= 0:
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E("socketcall_id for dispatch syscalls is only supported for x86 in '%s'" % t)
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return
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if t.has_key("mips"):
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t["asm-mips"] = self.mips_genstub(syscall_func, make__NR_name(syscall_name))
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if syscall.has_key("mips"):
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syscall["asm-mips"] = add_aliases(mips_genstub(syscall), syscall)
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if syscall.has_key("x86_64"):
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syscall["asm-x86_64"] = add_aliases(x86_64_genstub(syscall), syscall)
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if t.has_key("x86_64"):
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num_regs = count_generic_param_registers64(syscall_params)
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t["asm-x86_64"] = self.x86_64_genstub(syscall_func, num_regs, __NR_name, syscall_aliases)
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# Scan a Linux kernel asm/unistd.h file containing __NR_* constants
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# and write out equivalent SYS_* constants for glibc source compatibility.
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@ -379,22 +385,22 @@ class State:
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fp = create_file(path)
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fp.write("# Auto-generated by gensyscalls.py. Do not edit.\n")
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fp.write("syscall_src :=\n")
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for sc in self.syscalls:
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if sc.has_key("asm-%s" % arch):
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fp.write("syscall_src += arch-%s/syscalls/%s.S\n" % (arch, sc["func"]))
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for syscall in self.syscalls:
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if syscall.has_key("asm-%s" % arch):
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fp.write("syscall_src += arch-%s/syscalls/%s.S\n" % (arch, syscall["func"]))
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fp.close()
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self.other_files.append(path)
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# Write 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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for syscall in self.syscalls:
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for arch in all_arches:
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if sc.has_key("asm-%s" % arch):
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filename = "arch-%s/syscalls/%s.S" % (arch, sc["func"])
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if syscall.has_key("asm-%s" % arch):
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filename = "arch-%s/syscalls/%s.S" % (arch, syscall["func"])
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D2(">>> generating " + filename)
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fp = create_file(filename)
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fp.write(sc["asm-%s" % arch])
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fp.write(syscall["asm-%s" % arch])
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fp.close()
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self.new_stubs.append(filename)
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