diff options
Diffstat (limited to 'include/exec/exec-all.h')
| -rw-r--r-- | include/exec/exec-all.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h index e856191e40..6362074e9c 100644 --- a/include/exec/exec-all.h +++ b/include/exec/exec-all.h @@ -338,6 +338,23 @@ extern uintptr_t tci_tb_ptr; # elif defined (_ARCH_PPC) && !defined (_ARCH_PPC64) # define GETRA() ((uintptr_t)__builtin_return_address(0)) # define GETPC_LDST() ((uintptr_t) ((*(int32_t *)(GETRA() - 4)) - 1)) +# elif defined(__arm__) +/* We define two insns between the return address and the branch back to + straight-line. Find and decode that branch insn. */ +# define GETRA() ((uintptr_t)__builtin_return_address(0)) +# define GETPC_LDST() tcg_getpc_ldst(GETRA()) +static inline uintptr_t tcg_getpc_ldst(uintptr_t ra) +{ + int32_t b; + ra += 8; /* skip the two insns */ + b = *(int32_t *)ra; /* load the branch insn */ + b = (b << 8) >> (8 - 2); /* extract the displacement */ + ra += 8; /* branches are relative to pc+8 */ + ra += b; /* apply the displacement */ + ra -= 4; /* return a pointer into the current opcode, + not the start of the next opcode */ + return ra; +} # else # error "CONFIG_QEMU_LDST_OPTIMIZATION needs GETPC_LDST() implementation!" # endif |