From 7d14e0e2d661479985197203589c38840e1066df Mon Sep 17 00:00:00 2001 From: Sergey Fedorov Date: Fri, 22 Apr 2016 19:08:49 +0300 Subject: tcg/arm: Make direct jump patching thread-safe Ensure direct jump patching in ARM is atomic by using atomic_read()/atomic_set() for code patching. Signed-off-by: Sergey Fedorov Signed-off-by: Sergey Fedorov Message-Id: <1461341333-19646-8-git-send-email-sergey.fedorov@linaro.org> Signed-off-by: Richard Henderson --- tcg/arm/tcg-target.inc.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'tcg') diff --git a/tcg/arm/tcg-target.inc.c b/tcg/arm/tcg-target.inc.c index 2b7fbddbf0..977baa05c5 100644 --- a/tcg/arm/tcg-target.inc.c +++ b/tcg/arm/tcg-target.inc.c @@ -121,6 +121,14 @@ static inline void reloc_pc24(tcg_insn_unit *code_ptr, tcg_insn_unit *target) *code_ptr = (*code_ptr & ~0xffffff) | (offset & 0xffffff); } +static inline void reloc_pc24_atomic(tcg_insn_unit *code_ptr, tcg_insn_unit *target) +{ + ptrdiff_t offset = (tcg_ptr_byte_diff(target, code_ptr) - 8) >> 2; + tcg_insn_unit insn = atomic_read(code_ptr); + tcg_debug_assert(offset == sextract32(offset, 0, 24)); + atomic_set(code_ptr, deposit32(insn, 0, 24, offset)); +} + static void patch_reloc(tcg_insn_unit *code_ptr, int type, intptr_t value, intptr_t addend) { @@ -1038,6 +1046,16 @@ static void tcg_out_call(TCGContext *s, tcg_insn_unit *addr) } } +void arm_tb_set_jmp_target(uintptr_t jmp_addr, uintptr_t addr) +{ + tcg_insn_unit *code_ptr = (tcg_insn_unit *)jmp_addr; + tcg_insn_unit *target = (tcg_insn_unit *)addr; + + /* we could use a ldr pc, [pc, #-4] kind of branch and avoid the flush */ + reloc_pc24_atomic(code_ptr, target); + flush_icache_range(jmp_addr, jmp_addr + 4); +} + static inline void tcg_out_goto_label(TCGContext *s, int cond, TCGLabel *l) { if (l->has_value) { -- cgit v1.2.1