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tcg-i386: Remove abort from GETPC_LDST

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Indeed, remove it entirely and remove the is_tcg_gen_code check
from GETPC_EXT.

Fixes https://bugs.launchpad.net/qemu/+bug/1218098 wherein a call
to a "normal" helper function performed a sequence of tail calls
all the way into the memory helper functions, leading to a stack
frame in which the memory helper function appeared to be called
directly from tcg.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2013-08-29 08:21:37 -07:00 committed by Aurelien Jarno
parent 951fab990d
commit 584950fd4e
1 changed files with 5 additions and 5 deletions
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10
include/exec/exec-all.h
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@ -326,9 +326,7 @@ extern uintptr_t tci_tb_ptr;
(6) jump to corresponding code of the next of fast path (6) jump to corresponding code of the next of fast path
*/ */
# if defined(__i386__) || defined(__x86_64__) # if defined(__i386__) || defined(__x86_64__)
# define GETRA() ((uintptr_t)__builtin_return_address(0)) # define GETPC_EXT() GETPC()
/* The return address argument for ldst is passed directly. */
# define GETPC_LDST() (abort(), 0)
# elif defined (_ARCH_PPC) && !defined (_ARCH_PPC64) # elif defined (_ARCH_PPC) && !defined (_ARCH_PPC64)
# define GETRA() ((uintptr_t)__builtin_return_address(0)) # define GETRA() ((uintptr_t)__builtin_return_address(0))
# define GETPC_LDST() ((uintptr_t) ((*(int32_t *)(GETRA() - 4)) - 1)) # define GETPC_LDST() ((uintptr_t) ((*(int32_t *)(GETRA() - 4)) - 1))
@ -349,7 +347,7 @@ static inline uintptr_t tcg_getpc_ldst(uintptr_t ra)
not the start of the next opcode */ not the start of the next opcode */
return ra; return ra;
} }
#elif defined(__aarch64__) # elif defined(__aarch64__)
# define GETRA() ((uintptr_t)__builtin_return_address(0)) # define GETRA() ((uintptr_t)__builtin_return_address(0))
# define GETPC_LDST() tcg_getpc_ldst(GETRA()) # define GETPC_LDST() tcg_getpc_ldst(GETRA())
static inline uintptr_t tcg_getpc_ldst(uintptr_t ra) static inline uintptr_t tcg_getpc_ldst(uintptr_t ra)
@ -367,7 +365,9 @@ static inline uintptr_t tcg_getpc_ldst(uintptr_t ra)
# error "CONFIG_QEMU_LDST_OPTIMIZATION needs GETPC_LDST() implementation!" # error "CONFIG_QEMU_LDST_OPTIMIZATION needs GETPC_LDST() implementation!"
# endif # endif
bool is_tcg_gen_code(uintptr_t pc_ptr); bool is_tcg_gen_code(uintptr_t pc_ptr);
# define GETPC_EXT() (is_tcg_gen_code(GETRA()) ? GETPC_LDST() : GETPC()) # ifndef GETPC_EXT
# define GETPC_EXT() (is_tcg_gen_code(GETRA()) ? GETPC_LDST() : GETPC())
# endif
#else #else
# define GETPC_EXT() GETPC() # define GETPC_EXT() GETPC()
#endif #endif