From: Matt Turner <[email protected]> Define HAVE_ELF_CORE_DUMP and target_elf_gregset_t in target_elf.h, mirroring the kernel's elf_gregset_t (ELF_NGREG = 66): r0-r31 [0..31], f0-f31 [32..63], pc [64], unique [65]. Implement elf_core_copy_regs() in elfload.c to populate the gregset from CPUAlphaState.
Without this, bprm->core_dump is NULL for Alpha targets. When a guest signal goes unhandled, dump_core_and_abort() skips the core write and falls through to die_with_signal(), which re-raises the signal to the host. The host kernel then writes an x86-64 core file for the qemu-alpha process instead of an Alpha guest core. v2: Store thread unique field, same as in Linux kernel. Added by Helge & suggested by Richard. Signed-off-by: Matt Turner <[email protected]> Signed-off-by: Helge Deller <[email protected]> Reviewed-by: Richard Henderson <[email protected]> (cherry picked from commit 9db18ed0631d09f349057c22f7872b2c45275d0c) (Mjt: for 10.0.x, move everything to linux-user/elfload.c: v10.1.0-36-g58afe4cfe93 "linux-user: Create target/elfload.c files", use USE_ELF_CORE_DUMP define instead of HAVE_ELF_CORE_DUMP: v10.1.0-115-gbb130c17588 "linux-user: Rename USE_ELF_CORE_DUMP to HAVE_ELF_CORE_DUMP") Signed-off-by: Michael Tokarev <[email protected]> diff --git a/linux-user/elfload.c b/linux-user/elfload.c index fdc84de4bad..35b7ea23880 100644 --- a/linux-user/elfload.c +++ b/linux-user/elfload.c @@ -1728,6 +1728,29 @@ static inline void init_thread(struct target_pt_regs *regs, regs->usp = infop->start_stack; } +/* + * Matches the kernel's elf_gregset_t (ELF_NGREG = 33): + * r0-r30 at indices 0-30, pc at 31, ps at 32. + * r31 (hardwired zero) is not stored; pc occupies index 31. + */ +typedef struct target_elf_gregset_t { + abi_ulong regs[31]; /* integer registers r0-r30 [0..30] */ + abi_ulong pc; /* program counter [31] */ + abi_ulong unique; /* thread's UNIQUE field [32] */ +} target_elf_gregset_t; + +static void elf_core_copy_regs(target_elf_gregset_t *r, const CPUAlphaState *env) +{ + int i; + + for (i = 0; i < 31; i++) { + r->regs[i] = tswap64(env->ir[i]); + } + r->pc = tswap64(env->pc); + r->unique = tswap64(env->unique); +} + +#define USE_ELF_CORE_DUMP #define ELF_EXEC_PAGESIZE 8192 #endif /* TARGET_ALPHA */ -- 2.47.3
