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Gracefully handle unknown system calls. #98

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Mar 4, 2019
Merged

Gracefully handle unknown system calls. #98

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12 changes: 9 additions & 3 deletions plasma/lib/arch/x86/int80.py
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,8 @@
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#

from collections import defaultdict

from capstone.x86 import (X86_REG_EBX, X86_REG_ECX, X86_REG_EDX, X86_REG_ESI,
X86_INS_INT, X86_OP_IMM, X86_REG_AL, X86_REG_AX, X86_REG_EAX,
X86_REG_RAX, X86_REG_BL, X86_REG_CL, X86_REG_DL, X86_REG_BX,
Expand Down Expand Up @@ -57,7 +59,7 @@

# http://docs.cs.up.ac.za/programming/asm/derick_tut/syscalls.html

SYSCALL = {
SYSCALL_DATA = {
1: {"name": "exit", "args_type": [ARG_INT]},
# 2: {"name": "fork", "args_type": ['struct pt_regs']},
2: {"name": "fork", "args_type": []},
Expand Down Expand Up @@ -241,6 +243,10 @@
190: {"name": "vfork", "args_type": ['struct pt_regs']},
}

def SYSCALL(no):
if no not in SYSCALL_DATA:
SYSCALL_DATA[no] = {"name": "SYS%d" % no, "args_type": []}
return SYSCALL_DATA[no]


def reg_write(inst, reg_id):
Expand Down Expand Up @@ -292,11 +298,11 @@ def read_block(ctx, blk):
inline_comm[inst.address] = "?"
continue

inline_comm[inst.address] = SYSCALL[sysnum]["name"] + "("
inline_comm[inst.address] = SYSCALL(sysnum)["name"] + "("

# Search values for each args, otherwise print the register

args_type = SYSCALL[sysnum]["args_type"]
args_type = SYSCALL(sysnum)["args_type"]
for j in range(len(args_type)):
idx_wr_reg = search_backward(blk, i, ARGS_ORDER[j])

Expand Down