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| author | Malfurious <m@lfurio.us> | 2024-05-04 07:32:18 -0400 |
|---|---|---|
| committer | Malfurious <m@lfurio.us> | 2024-05-08 05:57:59 -0400 |
| commit | 47cf13e8429e813aa2fd2b1f41f87722bc616d19 (patch) | |
| tree | 9c994ceef54c8141fa40d6924be88160c7c8e19d /architecture.c | |
| parent | d187dfc3c81d987ef851b3806fc0ba372c8a3348 (diff) | |
| download | misplays-47cf13e8429e813aa2fd2b1f41f87722bc616d19.tar.gz misplays-47cf13e8429e813aa2fd2b1f41f87722bc616d19.zip | |
Parameterize architecture-specific details
Abstract architecture details into architecture.h and add x86 constants.
This is slightly complicated by the fact that 64-bit hosts can run
32-bit code, so we do still need to resolve some values dynamically.
The architecture_info() function is intented to address this, and
performs parameter lookups based on the current state of the guest
process.
Resolving values on a per-process-state basis is important due to the
process model under Linux. If we fork to debug a 32-bit program, the
forked process will be native 64-bit until the execve system call. And
of course, the process is then free to exec anything it likes later on
as well.
Signed-off-by: Malfurious <m@lfurio.us>
Diffstat (limited to 'architecture.c')
| -rw-r--r-- | architecture.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/architecture.c b/architecture.c new file mode 100644 index 0000000..67838a0 --- /dev/null +++ b/architecture.c @@ -0,0 +1,30 @@ +#include "architecture.h" + +void architecture_info(struct archinfo *ai, const struct iovec *regs) { + user_regs_t *data = regs->iov_base; + + /* Not every platform supports 64-bits, but those that do are generally + * backward compatible with 32-bits, so this is the one we explicitly + * compare with. */ + if (regs->iov_len == sizeof(struct user_regs_32)) { + ai->progmctr = data->PROGMCTR_32; + ai->stackptr = data->STACKPTR_32; + ai->bp_insn = BREAKPOINT_INSN_32; + ai->bp_mask = BREAKPOINT_MASK_32; + ai->bp_adjust = BREAKPOINT_ADJS_32; + ai->cs_arch = CAPSTONE_ARCH_32; + ai->cs_mode = CAPSTONE_MODE_32; + ai->cs_call = CAPSTONE_CALL_32; + ai->wordsize = WORDSIZE_32; + } else { + ai->progmctr = data->PROGMCTR_64; + ai->stackptr = data->STACKPTR_64; + ai->bp_insn = BREAKPOINT_INSN_64; + ai->bp_mask = BREAKPOINT_MASK_64; + ai->bp_adjust = BREAKPOINT_ADJS_64; + ai->cs_arch = CAPSTONE_ARCH_64; + ai->cs_mode = CAPSTONE_MODE_64; + ai->cs_call = CAPSTONE_CALL_64; + ai->wordsize = WORDSIZE_64; + } +} |