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/* Since sparc's g0 register is hardcoded to 0 in the ISA, the kernel does not
* bother copying it out when using the regs ptrace. Instead it shifts things
* by one and stores [g1..g7] in [0..6] and [o0..o7] in [7..14] (leaving the
* last u_reg[15] unused).
*
* Oddly, the kernel defines are not adjusted to the values as they written in
* the register structure -- UREG_G0 is 0, UREG_G1 is 1, etc... So we have to
* define our own to get correct behavior. Also, the kernel uses UREG_I# when
* it's easier for us to think of it in terms of UREG_O# (register windows!).
*
* This should work for both 32 and 64 bit Linux userland.
*/
#define U_REG_G1 0
#define U_REG_O0 7
#undef _trace_possible
#define _trace_possible _trace_possible
#ifdef SB_PERSONALITIES
static const struct syscall_entry syscall_table_32[] = {
#ifdef SB_PERSONALITIES_sparc
#define S(s) { SB_SYS_sparc_##s, SB_NR_##s, #s },
#include "trace_syscalls_sparc.h"
#undef S
#endif
{ SB_NR_UNDEF, SB_NR_UNDEF, NULL },
};
static const struct syscall_entry syscall_table_64[] = {
#ifdef SB_PERSONALITIES_sparc64
#define S(s) { SB_SYS_sparc64_##s, SB_NR_##s, #s },
#include "trace_syscalls_sparc64.h"
#undef S
#endif
{ SB_NR_UNDEF, SB_NR_UNDEF, NULL },
};
static bool pers_is_32(trace_regs *regs)
{
#ifdef __arch64__
/* Sparc does not make it easy to detect 32-bit vs 64-bit.
* Inspect the syscall trap insn to see which one it is.
*/
unsigned long ret = do_ptrace(PTRACE_PEEKTEXT, (void *)regs->tpc, NULL);
return (ret >> 32) == 0x91d02010;
#else
return true;
#endif
}
static const struct syscall_entry *trace_check_personality(void *vregs)
{
trace_regs *regs = vregs;
if (pers_is_32(regs))
return syscall_table_32;
else
return syscall_table_64;
}
static bool _trace_possible(const void *data)
{
#ifdef __arch64__
/* sparc64 can trace sparc32. */
return true;
#else
/* sparc32 can only trace sparc32 :(. */
const Elf64_Ehdr *ehdr = data;
return ehdr->e_ident[EI_CLASS] == ELFCLASS32;
#endif
}
#else
static bool _trace_possible(const void *data)
{
const Elf64_Ehdr *ehdr = data;
#ifdef __arch64__
return ehdr->e_ident[EI_CLASS] == ELFCLASS64;
#else
return ehdr->e_ident[EI_CLASS] == ELFCLASS32;
#endif
}
#endif
/* Sparc systems have swapped the addr/data args. */
#undef trace_get_regs
#undef trace_set_regs
#ifdef __arch64__
# define trace_get_regs(regs) do_ptrace(PTRACE_GETREGS64, regs, NULL)
# define trace_set_regs(regs) do_ptrace(PTRACE_SETREGS64, regs, NULL)
#else
# define trace_get_regs(regs) do_ptrace(PTRACE_GETREGS, regs, NULL)
# define trace_set_regs(regs) do_ptrace(PTRACE_SETREGS, regs, NULL)
#endif
#define trace_reg_sysnum u_regs[U_REG_G1]
static long trace_raw_ret(void *vregs)
{
trace_regs *regs = vregs;
return regs->u_regs[U_REG_O0];
}
static void trace_set_ret(void *vregs, int err)
{
trace_regs *regs = vregs;
#ifndef __arch64__
/* The carry bit is used to flag errors. */
regs->psr |= PSR_C;
#else
regs->tstate |= 0x1100000000;
#endif
/* Userland negates the value on sparc. */
regs->u_regs[U_REG_O0] = err;
trace_set_regs(regs);
}
static unsigned long trace_arg(void *vregs, int num)
{
trace_regs *regs = vregs;
if (num < 7)
return regs->u_regs[U_REG_O0 + num - 1];
else
return -1;
}
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