#include "ptrace.h"
#include "proc.h"
#include "value.h"
+#include "ltrace-elf.h"
static int allocate_gpr(struct fetch_context *ctx, struct process *proc,
- struct arg_type_info *info, struct value *valuep);
+ struct arg_type_info *info, struct value *valuep,
+ size_t off, bool is_hfa_type);
/* Floating point registers have the same width on 32-bit as well as
* 64-bit PPC, but <ucontext.h> presents a different API depending on
gregs64_t r64;
} regs;
struct fpregs_t fpregs;
-
+ int vgreg;
+ int struct_size;
+ int struct_hfa_size;
+ int struct_hfa_count;
};
static int
if (proc->e_machine == EM_PPC)
context->stack_pointer = proc->stack_pointer + 8;
else
- context->stack_pointer = proc->stack_pointer + 112;
+ context->stack_pointer = proc->stack_pointer
+ + STACK_FRAME_OVERHEAD;
/* When ltrace is 64-bit, we might use PTRACE_GETREGS to
* obtain 64-bit as well as 32-bit registers. But if we do it
return NULL;
}
+ context->vgreg = context->greg;
+ context->struct_size = 0;
+ context->struct_hfa_size = 0;
+ context->struct_hfa_count = 0;
+
/* Aggregates or unions of any length, and character strings
* of length longer than 8 bytes, will be returned in a
* storage buffer allocated by the caller. The caller will
* in r3, causing the first explicit argument to be passed in
* r4. */
context->ret_struct = ret_info->type == ARGTYPE_STRUCT;
- if (context->ret_struct)
+ if (context->ret_struct) {
+#if _CALL_ELF == 2
+ /* if R3 points to stack, parameters will be in R4. */
+ uint64_t pstack_end = ptrace(PTRACE_PEEKTEXT, proc->pid,
+ proc->stack_pointer, 0);
+ if (((arch_addr_t)context->regs.r64[3] > proc->stack_pointer)
+ && (context->regs.r64[3] < pstack_end)) {
+ context->greg++;
+ context->stack_pointer += 8;
+ }
+#else
context->greg++;
+#endif
+ }
return context;
}
static int
allocate_stack_slot(struct fetch_context *ctx, struct process *proc,
- struct arg_type_info *info, struct value *valuep)
+ struct arg_type_info *info, struct value *valuep,
+ bool is_hfa_type)
{
size_t sz = type_sizeof(proc, info);
if (sz == (size_t)-1)
size_t off = 0;
if (proc->e_machine == EM_PPC && a < 4)
a = 4;
+#if _CALL_ELF == 2
+ else if (proc->e_machine == EM_PPC64 && sz == 4 && is_hfa_type)
+ a = 4;
+ else
+ a = 8;
+#else
else if (proc->e_machine == EM_PPC64 && a < 8)
+#endif
a = 8;
/* XXX Remove the two double casts when arch_addr_t
if (valuep != NULL)
value_in_inferior(valuep, ctx->stack_pointer + off);
- ctx->stack_pointer += sz;
+ ctx->stack_pointer += a;
return 0;
}
static int
allocate_gpr(struct fetch_context *ctx, struct process *proc,
- struct arg_type_info *info, struct value *valuep)
+ struct arg_type_info *info, struct value *valuep,
+ size_t off, bool is_hfa_type)
{
if (ctx->greg > 10)
- return allocate_stack_slot(ctx, proc, info, valuep);
+ return allocate_stack_slot(ctx, proc, info, valuep, is_hfa_type);
- int reg_num = ctx->greg++;
- if (valuep == NULL)
- return 0;
+ int reg_num = ctx->greg;
size_t sz = type_sizeof(proc, info);
if (sz == (size_t)-1)
return -1;
assert(sz == 1 || sz == 2 || sz == 4 || sz == 8);
+#if _CALL_ELF == 2
+ /* Consume the stack slot corresponding to this arg. */
+ if ((sz + off) >= 8)
+ ctx->greg++;
+
+ if (is_hfa_type)
+ ctx->stack_pointer += sz;
+ else
+ ctx->stack_pointer += 8;
+#else
+ ctx->greg++;
+#endif
+
+ if (valuep == NULL)
+ return 0;
+
if (value_reserve(valuep, sz) == NULL)
return -1;
u.i64 = read_gpr(ctx, proc, reg_num);
if (proc->e_machine == EM_PPC)
align_small_int(u.buf, 8, sz);
- memcpy(value_get_raw_data(valuep), u.buf, sz);
+ memcpy(value_get_raw_data(valuep), u.buf + off, sz);
return 0;
}
static int
allocate_float(struct fetch_context *ctx, struct process *proc,
- struct arg_type_info *info, struct value *valuep)
+ struct arg_type_info *info, struct value *valuep,
+ size_t off, bool is_hfa_type)
{
int pool = proc->e_machine == EM_PPC64 ? 13 : 8;
if (ctx->freg <= pool) {
} u = { .d = ctx->fpregs.fpregs[ctx->freg] };
ctx->freg++;
+
+ if (!is_hfa_type)
+ ctx->vgreg++;
+
if (proc->e_machine == EM_PPC64)
- allocate_gpr(ctx, proc, info, NULL);
+ allocate_gpr(ctx, proc, info, NULL, off, is_hfa_type);
size_t sz = sizeof(double);
if (info->type == ARGTYPE_FLOAT) {
memcpy(value_get_raw_data(valuep), u.buf, sz);
return 0;
}
- return allocate_stack_slot(ctx, proc, info, valuep);
+ return allocate_stack_slot(ctx, proc, info, valuep, is_hfa_type);
+}
+
+#if _CALL_ELF == 2
+static int
+allocate_hfa(struct fetch_context *ctx, struct process *proc,
+ struct arg_type_info *info, struct value *valuep,
+ enum arg_type hfa_type, size_t hfa_count)
+{
+ size_t sz = type_sizeof(proc, info);
+ if (sz == (size_t)-1)
+ return -1;
+
+ ctx->struct_hfa_size += sz;
+
+ /* There are two changes regarding structure return types:
+ * * heterogeneous float/vector structs are returned
+ * in (multiple) FP/vector registers,
+ * instead of via implicit reference.
+ * * small structs (up to 16 bytes) are return
+ * in one or two GPRs, instead of via implicit reference.
+ *
+ * Other structures (larger than 16 bytes, not heterogeneous)
+ * are still returned via implicit reference (i.e. a pointer
+ * to memory where to return the struct being passed in r3).
+ * Of course, whether or not an implicit reference pointer
+ * is present will shift the remaining arguments,
+ * so you need to get this right for ELFv2 in order
+ * to get the arguments correct.
+ * If an actual parameter is known to correspond to an HFA
+ * formal parameter, each element is passed in the next
+ * available floating-point argument register starting at fp1
+ * until the fp13. The remaining elements of the aggregate are
+ * passed on the stack. */
+ size_t slot_off = 0;
+
+ unsigned char *buf = value_reserve(valuep, sz);
+ if (buf == NULL)
+ return -1;
+
+ struct arg_type_info *hfa_info = type_get_simple(hfa_type);
+ size_t hfa_sz = type_sizeof(proc, hfa_info);
+
+ if (hfa_count > 8)
+ ctx->struct_hfa_count += hfa_count;
+
+ while (hfa_count > 0 && ctx->freg <= 13) {
+ int rc;
+ struct value tmp;
+
+ value_init(&tmp, proc, NULL, hfa_info, 0);
+
+ /* Hetereogeneous struct - get value on GPR or stack. */
+ if (((hfa_type == ARGTYPE_FLOAT
+ || hfa_type == ARGTYPE_DOUBLE)
+ && hfa_count <= 8))
+ rc = allocate_float(ctx, proc, hfa_info, &tmp,
+ slot_off, true);
+ else
+ rc = allocate_gpr(ctx, proc, hfa_info, &tmp,
+ slot_off, true);
+
+ memcpy(buf, value_get_data(&tmp, NULL), hfa_sz);
+
+ slot_off += hfa_sz;
+ buf += hfa_sz;
+ hfa_count--;
+ if (slot_off == 8) {
+ slot_off = 0;
+ ctx->vgreg++;
+ }
+
+ value_destroy(&tmp);
+ if (rc < 0)
+ return -1;
+ }
+ if (hfa_count == 0)
+ return 0;
+
+ /* if no remaining FP, GPR corresponding to slot is used
+ * Mostly it is in part of r10. */
+ if (ctx->struct_hfa_size <= 64 && ctx->vgreg == 10) {
+ while (ctx->vgreg <= 10) {
+ struct value tmp;
+ value_init(&tmp, proc, NULL, hfa_info, 0);
+ union {
+ uint64_t i64;
+ unsigned char buf[0];
+ } u;
+
+ u.i64 = read_gpr(ctx, proc, ctx->vgreg);
+
+ memcpy(buf, u.buf + slot_off, hfa_sz);
+ slot_off += hfa_sz;
+ buf += hfa_sz;
+ hfa_count--;
+ ctx->stack_pointer += hfa_sz;
+ if (slot_off >= 8 ) {
+ slot_off = 0;
+ ctx->vgreg++;
+ }
+ value_destroy(&tmp);
+ }
+ }
+
+ if (hfa_count == 0)
+ return 0;
+
+ /* Remaining values are on stack */
+ while (hfa_count) {
+ struct value tmp;
+ value_init(&tmp, proc, NULL, hfa_info, 0);
+
+ value_in_inferior(&tmp, ctx->stack_pointer);
+ memcpy(buf, value_get_data(&tmp, NULL), hfa_sz);
+ ctx->stack_pointer += hfa_sz;
+ buf += hfa_sz;
+ hfa_count--;
+ }
+ return 0;
}
+#endif
static int
allocate_argument(struct fetch_context *ctx, struct process *proc,
case ARGTYPE_FLOAT:
case ARGTYPE_DOUBLE:
- return allocate_float(ctx, proc, info, valuep);
+ return allocate_float(ctx, proc, info, valuep,
+ 8 - type_sizeof(proc,info), false);
case ARGTYPE_STRUCT:
if (proc->e_machine == EM_PPC) {
if (value_pass_by_reference(valuep) < 0)
return -1;
} else {
+#if _CALL_ELF == 2
+ struct arg_type_info *hfa_info;
+ size_t hfa_size;
+ hfa_info = type_get_hfa_type(info, &hfa_size);
+ if (hfa_info != NULL ) {
+ size_t sz = type_sizeof(proc, info);
+ ctx->struct_size += sz;
+ return allocate_hfa(ctx, proc, info, valuep,
+ hfa_info->type, hfa_size);
+ }
+#endif
/* PPC64: Fixed size aggregates and unions passed by
* value are mapped to as many doublewords of the
* parameter save area as the value uses in memory.
size_t sz = type_sizeof(proc, valuep->type);
if (sz == (size_t)-1)
return -1;
+
+ if (ctx->ret_struct)
+ ctx->struct_size += sz;
+
size_t slots = (sz + width - 1) / width; /* Round up. */
unsigned char *buf = value_reserve(valuep, slots * width);
if (buf == NULL)
struct arg_type_info *fp_info
= type_get_fp_equivalent(valuep->type);
if (fp_info != NULL)
- rc = allocate_float(ctx, proc, fp_info, &val);
+ rc = allocate_float(ctx, proc, fp_info, &val,
+ 8-type_sizeof(proc,info), false);
else
- rc = allocate_gpr(ctx, proc, long_info, &val);
+ rc = allocate_gpr(ctx, proc, long_info, &val,
+ 0, false);
if (rc >= 0) {
memcpy(ptr, value_get_data(&val, NULL), width);
return rc;
}
+#ifndef __LITTLE_ENDIAN__
/* Small values need post-processing. */
if (sz < width) {
switch (info->type) {
break;
}
}
+#endif
return 0;
}
struct process *proc, struct arg_type_info *info,
struct value *valuep)
{
+ if (fetch_context_init(proc, ctx) < 0)
+ return -1;
+
+#if _CALL_ELF == 2
+ void *ptr = (void *)(ctx->regs.r64[1]+32);
+ uint64_t val = ptrace(PTRACE_PEEKTEXT, proc->pid, ptr, 0);
+
+ if (ctx->ret_struct
+ && ((ctx->struct_size > 64
+ || ctx->struct_hfa_count > 8
+ || (ctx->struct_hfa_size == 0 && ctx->struct_size > 56)
+ || (ctx->regs.r64[3] == ctx->regs.r64[1]+32)
+ || (ctx->regs.r64[3] == val )))) {
+#else
if (ctx->ret_struct) {
+#endif
assert(info->type == ARGTYPE_STRUCT);
uint64_t addr = read_gpr(ctx, proc, 3);
return 0;
}
- if (fetch_context_init(proc, ctx) < 0)
- return -1;
return allocate_argument(ctx, proc, info, valuep);
}
projects / platform / upstream / ltrace.git / blobdiff