![]() Void helper_syscall (CPUX86State *env, int next_eip_addend) (use CONFIG_USER_ONLY to choose different implementation for user mode emulation and full system emulation) target/i386/tcg/seg_helper.c 979 The function get_helper_syscall will insert a call backend-op into TCG code, and the target of the call instruction is function helper_syscall, which is at line 979 of target/i386/tcg/seg_helper.c. */įunctions with prefix gen are responsible for generating corresponding backend-ops, but get_helper_syscall is more special. ![]() Generated after one has entered CPL0 if TF is set in FMASK. The TF bit is checkedĪfter the syscall insn completes. * TF handling for the syscall insn is different. Gen_helper_syscall(cpu_env, tcg_const_i32(s->pc - pc_start)) Take QEMU-5.0.0-rc4 for example, how QEMU emulating syscall instruction of i386 is at line 7381 of target/i386/tcg/translate.c : target/i386/tcg/translate.c 7381 Helper functions provides another way to implement these instruction. The tcg/README is a good place to start.īecause TCG-IR is relatively simple, some target instructions are hard to be implemented by pure TCG-IR. TCG is abbreviation of Tiny Code Generator, the TCG frontend lifts target instructions into TCG-IR and the TCG backend lowers the TCG-IR into host instructions. ![]() Rewriting some of notes in my obsidian into a post seems to be a good idea. ![]()
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