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target/xtensa: add linux-user support

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Import list of syscalls from the kernel source. Conditionalize code/data
that is only used with softmmu. Implement exception handlers. Implement
signal hander (only the core registers for now, no coprocessors or TIE).

Cc: Riku Voipio <riku.voipio@iki.fi>
Cc: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2017-01-25 10:54:11 -08:00
parent bf9c3a5a96
commit ba7651fba5
22 changed files with 1705 additions and 44 deletions
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58
linux-user/elfload.c
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@ -1341,6 +1341,64 @@ static inline void init_thread(struct target_pt_regs *regs,
#endif /* TARGET_HPPA */
#ifdef TARGET_XTENSA
#define ELF_START_MMAP 0x20000000
#define ELF_CLASS ELFCLASS32
#define ELF_ARCH EM_XTENSA
static inline void init_thread(struct target_pt_regs *regs,
struct image_info *infop)
{
regs->windowbase = 0;
regs->windowstart = 1;
regs->areg[1] = infop->start_stack;
regs->pc = infop->entry;
}
/* See linux kernel: arch/xtensa/include/asm/elf.h. */
#define ELF_NREG 128
typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
enum {
TARGET_REG_PC,
TARGET_REG_PS,
TARGET_REG_LBEG,
TARGET_REG_LEND,
TARGET_REG_LCOUNT,
TARGET_REG_SAR,
TARGET_REG_WINDOWSTART,
TARGET_REG_WINDOWBASE,
TARGET_REG_THREADPTR,
TARGET_REG_AR0 = 64,
};
static void elf_core_copy_regs(target_elf_gregset_t *regs,
const CPUXtensaState *env)
{
unsigned i;
(*regs)[TARGET_REG_PC] = tswapreg(env->pc);
(*regs)[TARGET_REG_PS] = tswapreg(env->sregs[PS] & ~PS_EXCM);
(*regs)[TARGET_REG_LBEG] = tswapreg(env->sregs[LBEG]);
(*regs)[TARGET_REG_LEND] = tswapreg(env->sregs[LEND]);
(*regs)[TARGET_REG_LCOUNT] = tswapreg(env->sregs[LCOUNT]);
(*regs)[TARGET_REG_SAR] = tswapreg(env->sregs[SAR]);
(*regs)[TARGET_REG_WINDOWSTART] = tswapreg(env->sregs[WINDOW_START]);
(*regs)[TARGET_REG_WINDOWBASE] = tswapreg(env->sregs[WINDOW_BASE]);
(*regs)[TARGET_REG_THREADPTR] = tswapreg(env->uregs[THREADPTR]);
xtensa_sync_phys_from_window((CPUXtensaState *)env);
for (i = 0; i < env->config->nareg; ++i) {
(*regs)[TARGET_REG_AR0 + i] = tswapreg(env->phys_regs[i]);
}
}
#define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE 4096
#endif /* TARGET_XTENSA */
#ifndef ELF_PLATFORM
#define ELF_PLATFORM (NULL)
#endif