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parasite: Remove unneeded on-stack variables

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Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
This commit is contained in:
Pavel Emelyanov
2012-02-12 14:48:37 +04:00
committed by Cyrill Gorcunov
parent 250d4e9111
commit 2b1a58b3b4
2 changed files with 4 additions and 16 deletions
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6
include/parasite.h
View File

@@ -46,12 +46,6 @@ enum {
PARASITE_CMD_MAX,
};
typedef struct {
unsigned long command;
unsigned long args_size;
void *args;
} parasite_args_t;
typedef struct {
long ret; /* custom ret code */
long sys_ret; /* syscall ret code */

14
parasite-syscall.c
View File

@@ -190,31 +190,25 @@ static struct vma_area *get_vma_by_ip(struct list_head *vma_area_list, unsigned
int parasite_execute(unsigned long cmd, struct parasite_ctl *ctl,
parasite_status_t *args, int args_size)
{
parasite_args_t parasite_arg = { };
user_regs_struct_t regs, regs_orig;
int status, ret = -1;
siginfo_t siginfo;
jerr(ptrace(PTRACE_GETREGS, ctl->pid, NULL, &regs_orig), err);
parasite_arg.command = cmd;
parasite_arg.args_size = args_size;
parasite_arg.args = args;
/*
* Pass the command first, it's immutable.
*/
jerr(ptrace_poke_area((long)ctl->pid, (void *)&parasite_arg.command,
(void *)ctl->addr_cmd, sizeof(parasite_arg.command)),
err_restore);
jerr(ptrace_poke_area((long)ctl->pid, (void *)&cmd, (void *)ctl->addr_cmd,
sizeof(cmd)), err_restore);
again:
regs = regs_orig;
regs.ip = ctl->parasite_ip;
jerr(ptrace(PTRACE_SETREGS, ctl->pid, NULL, &regs), err_restore);
if (ptrace_poke_area((long)ctl->pid, (void *)parasite_arg.args,
(void *)ctl->addr_args, parasite_arg.args_size)) {
if (ptrace_poke_area((long)ctl->pid, (void *)args,
(void *)ctl->addr_args, args_size)) {
pr_err("Can't setup parasite arguments (pid: %d)\n", ctl->pid);
goto err_restore;
}