From 2ac09a5bbbff78d363ede2f038c31a9b1cb0887b Mon Sep 17 00:00:00 2001 From: Yao Qi Date: Tue, 28 Jun 2016 17:24:25 +0100 Subject: [PATCH] [AArch64] Use int64_t for address offset In AArch64 displaced stepping and fast tracepoint, GDB/GDBserver needs to check whether the offset can fit in the range. We are using int32_t for offset, it is sufficient to get an offset from an instruction, but it is not enough to get an offset from two addresses. For example, we have a BL in shared lib which is at 0x0000002000040774, and the scratch pad for displaced stepping is at 0x400698. The offset can't fit in 28 bit imm. However, since we are using int32_t for offset, GDB thinks the offset can fit it, and generate the B instruction with wrong offset. It fixes the following fail, -FAIL: gdb.base/dso2dso.exp: next over call to sub2 gdb: 2016-06-28 Yao Qi * aarch64-tdep.c (aarch64_displaced_step_b): Use int64_t for variable new_offset. gdb/gdbserver: 2016-06-28 Yao Qi * linux-aarch64-low.c (aarch64_ftrace_insn_reloc_b): Use int64_t for variable new_offset. (aarch64_ftrace_insn_reloc_b_cond): Likewise. (aarch64_ftrace_insn_reloc_cb): Likewise. (aarch64_ftrace_insn_reloc_tb): Likewise. (aarch64_install_fast_tracepoint_jump_pad): Likewise. Use PRIx64 instead of PRIx32. --- gdb/ChangeLog | 5 +++++ gdb/aarch64-tdep.c | 2 +- gdb/gdbserver/ChangeLog | 10 ++++++++++ gdb/gdbserver/linux-aarch64-low.c | 14 +++++++------- 4 files changed, 23 insertions(+), 8 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 2fbbc6c..c99ed23 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,8 @@ +2016-06-28 Yao Qi + + * aarch64-tdep.c (aarch64_displaced_step_b): Use int64_t for + variable new_offset. + 2016-06-27 Manish Goregaokar * rust-lang.c (rust_print_type, rust_decorations): Print unit diff --git a/gdb/aarch64-tdep.c b/gdb/aarch64-tdep.c index 88fcf4b..e5ce13e 100644 --- a/gdb/aarch64-tdep.c +++ b/gdb/aarch64-tdep.c @@ -2322,7 +2322,7 @@ aarch64_displaced_step_b (const int is_bl, const int32_t offset, { struct aarch64_displaced_step_data *dsd = (struct aarch64_displaced_step_data *) data; - int32_t new_offset = data->insn_addr - dsd->new_addr + offset; + int64_t new_offset = data->insn_addr - dsd->new_addr + offset; if (can_encode_int32 (new_offset, 28)) { diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog index f6f0ad9..30d0498 100644 --- a/gdb/gdbserver/ChangeLog +++ b/gdb/gdbserver/ChangeLog @@ -1,5 +1,15 @@ 2016-06-28 Yao Qi + * linux-aarch64-low.c (aarch64_ftrace_insn_reloc_b): Use int64_t + for variable new_offset. + (aarch64_ftrace_insn_reloc_b_cond): Likewise. + (aarch64_ftrace_insn_reloc_cb): Likewise. + (aarch64_ftrace_insn_reloc_tb): Likewise. + (aarch64_install_fast_tracepoint_jump_pad): Likewise. Use + PRIx64 instead of PRIx32. + +2016-06-28 Yao Qi + * linux-arm-low.c (arm_get_syscall_trapinfo): New function. (the_low_target): Install arm_get_syscall_trapinfo. diff --git a/gdb/gdbserver/linux-aarch64-low.c b/gdb/gdbserver/linux-aarch64-low.c index 7ac68dd..6efa035 100644 --- a/gdb/gdbserver/linux-aarch64-low.c +++ b/gdb/gdbserver/linux-aarch64-low.c @@ -1575,7 +1575,7 @@ aarch64_ftrace_insn_reloc_b (const int is_bl, const int32_t offset, { struct aarch64_insn_relocation_data *insn_reloc = (struct aarch64_insn_relocation_data *) data; - int32_t new_offset + int64_t new_offset = insn_reloc->base.insn_addr - insn_reloc->new_addr + offset; if (can_encode_int32 (new_offset, 28)) @@ -1590,7 +1590,7 @@ aarch64_ftrace_insn_reloc_b_cond (const unsigned cond, const int32_t offset, { struct aarch64_insn_relocation_data *insn_reloc = (struct aarch64_insn_relocation_data *) data; - int32_t new_offset + int64_t new_offset = insn_reloc->base.insn_addr - insn_reloc->new_addr + offset; if (can_encode_int32 (new_offset, 21)) @@ -1627,7 +1627,7 @@ aarch64_ftrace_insn_reloc_cb (const int32_t offset, const int is_cbnz, { struct aarch64_insn_relocation_data *insn_reloc = (struct aarch64_insn_relocation_data *) data; - int32_t new_offset + int64_t new_offset = insn_reloc->base.insn_addr - insn_reloc->new_addr + offset; if (can_encode_int32 (new_offset, 21)) @@ -1664,7 +1664,7 @@ aarch64_ftrace_insn_reloc_tb (const int32_t offset, int is_tbnz, { struct aarch64_insn_relocation_data *insn_reloc = (struct aarch64_insn_relocation_data *) data; - int32_t new_offset + int64_t new_offset = insn_reloc->base.insn_addr - insn_reloc->new_addr + offset; if (can_encode_int32 (new_offset, 16)) @@ -1800,7 +1800,7 @@ aarch64_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, { uint32_t buf[256]; uint32_t *p = buf; - int32_t offset; + int64_t offset; int i; uint32_t insn; CORE_ADDR buildaddr = *jump_entry; @@ -2137,7 +2137,7 @@ aarch64_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, { sprintf (err, "E.Jump back from jump pad too far from tracepoint " - "(offset 0x%" PRIx32 " cannot be encoded in 28 bits).", + "(offset 0x%" PRIx64 " cannot be encoded in 28 bits).", offset); return 1; } @@ -2151,7 +2151,7 @@ aarch64_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, { sprintf (err, "E.Jump pad too far from tracepoint " - "(offset 0x%" PRIx32 " cannot be encoded in 28 bits).", + "(offset 0x%" PRIx64 " cannot be encoded in 28 bits).", offset); return 1; } -- 2.7.4