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authorMike Frysinger <vapier@gentoo.org>2015-12-20 01:14:28 -0500
committerMike Frysinger <vapier@gentoo.org>2015-12-20 01:14:28 -0500
commit9d08c42993a418be6eafa1ffd4abf9e1c60ddd77 (patch)
tree9e40eb03f4f0fd7dbe61f1c2ec8252daa4d7a80e /libsandbox
parentlibsandbox: improve sparc trace code a bit more (diff)
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libsandbox: new s390/s390x ptrace port
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'libsandbox')
-rw-r--r--libsandbox/trace/linux/arch.c2
-rw-r--r--libsandbox/trace/linux/s390.c95
2 files changed, 97 insertions, 0 deletions
diff --git a/libsandbox/trace/linux/arch.c b/libsandbox/trace/linux/arch.c
index 957db3b..53461d6 100644
--- a/libsandbox/trace/linux/arch.c
+++ b/libsandbox/trace/linux/arch.c
@@ -13,6 +13,8 @@
# include "hppa.c"
#elif defined(__i386__)
# include "i386.c"
+#elif defined(__s390__)
+# include "s390.c"
#elif defined(__sparc__)
# include "sparc.c"
#elif defined(__x86_64__)
diff --git a/libsandbox/trace/linux/s390.c b/libsandbox/trace/linux/s390.c
new file mode 100644
index 0000000..acbf894
--- /dev/null
+++ b/libsandbox/trace/linux/s390.c
@@ -0,0 +1,95 @@
+#undef _trace_possible
+#define _trace_possible _trace_possible
+
+#ifdef SB_SCHIZO
+
+static const struct syscall_entry syscall_table_32[] = {
+#ifdef SB_SCHIZO_s390
+#define S(s) { SB_SYS_s390_##s, SB_NR_##s, #s },
+#include "trace_syscalls_s390.h"
+#undef S
+#endif
+ { SB_NR_UNDEF, SB_NR_UNDEF, NULL },
+};
+static const struct syscall_entry syscall_table_64[] = {
+#ifdef SB_SCHIZO_s390x
+#define S(s) { SB_SYS_s390x_##s, SB_NR_##s, #s },
+#include "trace_syscalls_s390x.h"
+#undef S
+#endif
+ { SB_NR_UNDEF, SB_NR_UNDEF, NULL },
+};
+
+static bool pers_is_31(trace_regs *regs)
+{
+ return regs->psw.mask & 0x100000000ul ? false : true;
+}
+
+static const struct syscall_entry *trace_check_personality(void *vregs)
+{
+ trace_regs *regs = vregs;
+ return pers_is_31(regs) ? syscall_table_32 : syscall_table_64;
+}
+
+static bool _trace_possible(const void *data)
+{
+ return true;
+}
+
+#else
+
+static bool _trace_possible(const void *data)
+{
+# ifdef __s390x__
+# define ELFCLASS ELFCLASS64
+# else
+# define ELFCLASS ELFCLASS32
+# endif
+ const Elf64_Ehdr *ehdr = data;
+ return (ehdr->e_ident[EI_CLASS] == ELFCLASS) &&
+ (ehdr->e_machine == EM_S390);
+}
+
+#endif
+
+#undef trace_get_regs
+static long trace_get_regs(void *vregs)
+{
+ ptrace_area parea = {
+ /* Most regs we want are at the start (pswmask, pswaddr, and gpr0...gpr7,
+ * but the orig_gpr2 is much further along in the area. */
+ .len = PT_ORIGGPR2 + sizeof(long),
+ .kernel_addr = PT_PSWMASK,
+ .process_addr = (uintptr_t)vregs,
+ };
+ do_ptrace(PTRACE_PEEKUSR_AREA, &parea, NULL);
+ return 0;
+}
+
+#undef trace_set_regs
+static long trace_set_regs(void *vregs)
+{
+ ptrace_area parea = {
+ /* Most regs we want are at the start (pswmask, pswaddr, and gpr0...gpr7,
+ * but the orig_gpr2 is much further along in the area. */
+ .len = PT_ORIGGPR2 + sizeof(long),
+ .kernel_addr = PT_PSWMASK,
+ .process_addr = (uintptr_t)vregs,
+ };
+ do_ptrace(PTRACE_POKEUSR_AREA, &parea, NULL);
+ return 0;
+}
+
+#define trace_reg_sysnum gprs[2]
+#define trace_reg_ret gprs[2]
+
+static unsigned long trace_arg(void *vregs, int num)
+{
+ trace_regs *regs = vregs;
+ if (num == 1)
+ return regs->orig_gpr2;
+ else if (num < 7)
+ return regs->gprs[2 + num - 1];
+ else
+ return -1;
+}