diff options
Diffstat (limited to 'gdb/i386-linux-nat.c')
| -rw-r--r-- | gdb/i386-linux-nat.c | 258 |
1 files changed, 0 insertions, 258 deletions
diff --git a/gdb/i386-linux-nat.c b/gdb/i386-linux-nat.c index bf5e821..2e46ead 100644 --- a/gdb/i386-linux-nat.c +++ b/gdb/i386-linux-nat.c @@ -23,7 +23,6 @@ /* For i386_linux_skip_solib_resolver. */ #include "symtab.h" -#include "frame.h" #include "symfile.h" #include "objfiles.h" @@ -1044,263 +1043,6 @@ i386_linux_skip_solib_resolver (CORE_ADDR pc) } -/* Recognizing signal handler frames. */ - -/* Linux has two flavors of signals. Normal signal handlers, and - "realtime" (RT) signals. The RT signals can provide additional - information to the signal handler if the SA_SIGINFO flag is set - when establishing a signal handler using `sigaction'. It is not - unlikely that future versions of Linux will support SA_SIGINFO for - normal signals too. */ - -/* When the i386 Linux kernel calls a signal handler and the - SA_RESTORER flag isn't set, the return address points to a bit of - code on the stack. This function returns whether the PC appears to - be within this bit of code. - - The instruction sequence for normal signals is - pop %eax - mov $0x77,%eax - int $0x80 - or 0x58 0xb8 0x77 0x00 0x00 0x00 0xcd 0x80. - - Checking for the code sequence should be somewhat reliable, because - the effect is to call the system call sigreturn. This is unlikely - to occur anywhere other than a signal trampoline. - - It kind of sucks that we have to read memory from the process in - order to identify a signal trampoline, but there doesn't seem to be - any other way. The IN_SIGTRAMP macro in tm-linux.h arranges to - only call us if no function name could be identified, which should - be the case since the code is on the stack. - - Detection of signal trampolines for handlers that set the - SA_RESTORER flag is in general not possible. Unfortunately this is - what the GNU C Library has been doing for quite some time now. - However, as of version 2.1.2, the GNU C Library uses signal - trampolines (named __restore and __restore_rt) that are identical - to the ones used by the kernel. Therefore, these trampolines are - supported too. */ - -#define LINUX_SIGTRAMP_INSN0 (0x58) /* pop %eax */ -#define LINUX_SIGTRAMP_OFFSET0 (0) -#define LINUX_SIGTRAMP_INSN1 (0xb8) /* mov $NNNN,%eax */ -#define LINUX_SIGTRAMP_OFFSET1 (1) -#define LINUX_SIGTRAMP_INSN2 (0xcd) /* int */ -#define LINUX_SIGTRAMP_OFFSET2 (6) - -static const unsigned char linux_sigtramp_code[] = -{ - LINUX_SIGTRAMP_INSN0, /* pop %eax */ - LINUX_SIGTRAMP_INSN1, 0x77, 0x00, 0x00, 0x00, /* mov $0x77,%eax */ - LINUX_SIGTRAMP_INSN2, 0x80 /* int $0x80 */ -}; - -#define LINUX_SIGTRAMP_LEN (sizeof linux_sigtramp_code) - -/* If PC is in a sigtramp routine, return the address of the start of - the routine. Otherwise, return 0. */ - -static CORE_ADDR -i386_linux_sigtramp_start (CORE_ADDR pc) -{ - unsigned char buf[LINUX_SIGTRAMP_LEN]; - - /* We only recognize a signal trampoline if PC is at the start of - one of the three instructions. We optimize for finding the PC at - the start, as will be the case when the trampoline is not the - first frame on the stack. We assume that in the case where the - PC is not at the start of the instruction sequence, there will be - a few trailing readable bytes on the stack. */ - - if (read_memory_nobpt (pc, (char *) buf, LINUX_SIGTRAMP_LEN) != 0) - return 0; - - if (buf[0] != LINUX_SIGTRAMP_INSN0) - { - int adjust; - - switch (buf[0]) - { - case LINUX_SIGTRAMP_INSN1: - adjust = LINUX_SIGTRAMP_OFFSET1; - break; - case LINUX_SIGTRAMP_INSN2: - adjust = LINUX_SIGTRAMP_OFFSET2; - break; - default: - return 0; - } - - pc -= adjust; - - if (read_memory_nobpt (pc, (char *) buf, LINUX_SIGTRAMP_LEN) != 0) - return 0; - } - - if (memcmp (buf, linux_sigtramp_code, LINUX_SIGTRAMP_LEN) != 0) - return 0; - - return pc; -} - -/* This function does the same for RT signals. Here the instruction - sequence is - mov $0xad,%eax - int $0x80 - or 0xb8 0xad 0x00 0x00 0x00 0xcd 0x80. - - The effect is to call the system call rt_sigreturn. */ - -#define LINUX_RT_SIGTRAMP_INSN0 (0xb8) /* mov $NNNN,%eax */ -#define LINUX_RT_SIGTRAMP_OFFSET0 (0) -#define LINUX_RT_SIGTRAMP_INSN1 (0xcd) /* int */ -#define LINUX_RT_SIGTRAMP_OFFSET1 (5) - -static const unsigned char linux_rt_sigtramp_code[] = -{ - LINUX_RT_SIGTRAMP_INSN0, 0xad, 0x00, 0x00, 0x00, /* mov $0xad,%eax */ - LINUX_RT_SIGTRAMP_INSN1, 0x80 /* int $0x80 */ -}; - -#define LINUX_RT_SIGTRAMP_LEN (sizeof linux_rt_sigtramp_code) - -/* If PC is in a RT sigtramp routine, return the address of the start - of the routine. Otherwise, return 0. */ - -static CORE_ADDR -i386_linux_rt_sigtramp_start (CORE_ADDR pc) -{ - unsigned char buf[LINUX_RT_SIGTRAMP_LEN]; - - /* We only recognize a signal trampoline if PC is at the start of - one of the two instructions. We optimize for finding the PC at - the start, as will be the case when the trampoline is not the - first frame on the stack. We assume that in the case where the - PC is not at the start of the instruction sequence, there will be - a few trailing readable bytes on the stack. */ - - if (read_memory_nobpt (pc, (char *) buf, LINUX_RT_SIGTRAMP_LEN) != 0) - return 0; - - if (buf[0] != LINUX_RT_SIGTRAMP_INSN0) - { - if (buf[0] != LINUX_RT_SIGTRAMP_INSN1) - return 0; - - pc -= LINUX_RT_SIGTRAMP_OFFSET1; - - if (read_memory_nobpt (pc, (char *) buf, LINUX_RT_SIGTRAMP_LEN) != 0) - return 0; - } - - if (memcmp (buf, linux_rt_sigtramp_code, LINUX_RT_SIGTRAMP_LEN) != 0) - return 0; - - return pc; -} - -/* Return whether PC is in a Linux sigtramp routine. */ - -int -i386_linux_in_sigtramp (CORE_ADDR pc, char *name) -{ - if (name) - return STREQ ("__restore", name) || STREQ ("__restore_rt", name); - - return (i386_linux_sigtramp_start (pc) != 0 - || i386_linux_rt_sigtramp_start (pc) != 0); -} - -/* Assuming FRAME is for a Linux sigtramp routine, return the address - of the associated sigcontext structure. */ - -CORE_ADDR -i386_linux_sigcontext_addr (struct frame_info *frame) -{ - CORE_ADDR pc; - - pc = i386_linux_sigtramp_start (frame->pc); - if (pc) - { - CORE_ADDR sp; - - if (frame->next) - /* If this isn't the top frame, the next frame must be for the - signal handler itself. The sigcontext structure lives on - the stack, right after the signum argument. */ - return frame->next->frame + 12; - - /* This is the top frame. We'll have to find the address of the - sigcontext structure by looking at the stack pointer. Keep - in mind that the first instruction of the sigtramp code is - "pop %eax". If the PC is at this instruction, adjust the - returned value accordingly. */ - sp = read_register (SP_REGNUM); - if (pc == frame->pc) - return sp + 4; - return sp; - } - - pc = i386_linux_rt_sigtramp_start (frame->pc); - if (pc) - { - if (frame->next) - /* If this isn't the top frame, the next frame must be for the - signal handler itself. The sigcontext structure is part of - the user context. A pointer to the user context is passed - as the third argument to the signal handler. */ - return read_memory_integer (frame->next->frame + 16, 4) + 20; - - /* This is the top frame. Again, use the stack pointer to find - the address of the sigcontext structure. */ - return read_memory_integer (read_register (SP_REGNUM) + 8, 4) + 20; - } - - error ("Couldn't recognize signal trampoline."); - return 0; -} - -/* Offset to saved PC in sigcontext, from <asm/sigcontext.h>. */ -#define LINUX_SIGCONTEXT_PC_OFFSET (56) - -/* Assuming FRAME is for a Linux sigtramp routine, return the saved - program counter. */ - -CORE_ADDR -i386_linux_sigtramp_saved_pc (struct frame_info *frame) -{ - CORE_ADDR addr; - addr = i386_linux_sigcontext_addr (frame); - return read_memory_integer (addr + LINUX_SIGCONTEXT_PC_OFFSET, 4); -} - -/* Offset to saved SP in sigcontext, from <asm/sigcontext.h>. */ -#define LINUX_SIGCONTEXT_SP_OFFSET (28) - -/* Assuming FRAME is for a Linux sigtramp routine, return the saved - stack pointer. */ - -CORE_ADDR -i386_linux_sigtramp_saved_sp (struct frame_info *frame) -{ - CORE_ADDR addr; - addr = i386_linux_sigcontext_addr (frame); - return read_memory_integer (addr + LINUX_SIGCONTEXT_SP_OFFSET, 4); -} - -/* Immediately after a function call, return the saved pc. */ - -CORE_ADDR -i386_linux_saved_pc_after_call (struct frame_info *frame) -{ - if (frame->signal_handler_caller) - return i386_linux_sigtramp_saved_pc (frame); - - return read_memory_integer (read_register (SP_REGNUM), 4); -} - - /* Register that we are able to handle Linux ELF core file formats. */ static struct core_fns linux_elf_core_fns = |