357af9be5c
Currently we make the assumption that the guest frontend loads all op code bytes sequentially. This mostly holds up for regular fixed encodings but some architectures like s390x like to re-read the instruction which causes weirdness to occur. Rather than changing the frontends make the plugin API a little more ergonomic and able to handle the re-read case. Stuff will still get strange if we read ahead of the opcode but so far no front ends have done that and this patch asserts the case so we can catch it early if they do. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Suggested-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20211026102234.3961636-21-alex.bennee@linaro.org>
80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
/*
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* Copyright (C) 2017, Emilio G. Cota <cota@braap.org>
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*
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* License: GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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* plugin-gen.h - TCG-dependent definitions for generating plugin code
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*
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* This header should be included only from plugin.c and C files that emit
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* TCG code.
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*/
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#ifndef QEMU_PLUGIN_GEN_H
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#define QEMU_PLUGIN_GEN_H
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#include "qemu/plugin.h"
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#include "tcg/tcg.h"
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struct DisasContextBase;
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#ifdef CONFIG_PLUGIN
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bool plugin_gen_tb_start(CPUState *cpu, const TranslationBlock *tb, bool supress);
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void plugin_gen_tb_end(CPUState *cpu);
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void plugin_gen_insn_start(CPUState *cpu, const struct DisasContextBase *db);
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void plugin_gen_insn_end(void);
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void plugin_gen_disable_mem_helpers(void);
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void plugin_gen_empty_mem_callback(TCGv addr, uint32_t info);
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static inline void plugin_insn_append(abi_ptr pc, const void *from, size_t size)
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{
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struct qemu_plugin_insn *insn = tcg_ctx->plugin_insn;
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abi_ptr off;
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if (insn == NULL) {
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return;
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}
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off = pc - insn->vaddr;
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if (off < insn->data->len) {
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g_byte_array_set_size(insn->data, off);
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} else if (off > insn->data->len) {
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/* we have an unexpected gap */
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g_assert_not_reached();
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}
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insn->data = g_byte_array_append(insn->data, from, size);
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}
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#else /* !CONFIG_PLUGIN */
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static inline
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bool plugin_gen_tb_start(CPUState *cpu, const TranslationBlock *tb, bool supress)
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{
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return false;
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}
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static inline
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void plugin_gen_insn_start(CPUState *cpu, const struct DisasContextBase *db)
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{ }
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static inline void plugin_gen_insn_end(void)
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{ }
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static inline void plugin_gen_tb_end(CPUState *cpu)
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{ }
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static inline void plugin_gen_disable_mem_helpers(void)
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{ }
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static inline void plugin_gen_empty_mem_callback(TCGv addr, uint32_t info)
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{ }
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static inline void plugin_insn_append(abi_ptr pc, const void *from, size_t size)
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{ }
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#endif /* CONFIG_PLUGIN */
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#endif /* QEMU_PLUGIN_GEN_H */
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