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chore: more detailed panic message

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This commit is contained in:
Rekai Nyangadzayi Musuka
2022-10-21 05:12:09 -03:00
parent 96d7285111
commit 443520ecae
8 changed files with 71 additions and 21 deletions
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70
src/cpu.zig
View File

@@ -109,14 +109,16 @@ pub const Arm7tdmi = struct {
}
pub inline fn hasSPSR(self: *const Self) bool {
return switch (getMode(self.cpsr.mode.read())) {
const mode = getMode(self.cpsr.mode.read()) orelse unreachable;
return switch (mode) {
.System, .User => false,
else => true,
};
}
pub inline fn isPrivileged(self: *const Self) bool {
return switch (getMode(self.cpsr.mode.read())) {
const mode = getMode(self.cpsr.mode.read()) orelse unreachable;
return switch (mode) {
.User => false,
else => true,
};
@@ -128,11 +130,12 @@ pub const Arm7tdmi = struct {
}
fn changeModeFromIdx(self: *Self, next: u5) void {
self.changeMode(getMode(next));
const mode = getMode(next) orelse unreachable;
self.changeMode(mode);
}
pub fn changeMode(self: *Self, next: Mode) void {
const now = getMode(self.cpsr.mode.read());
const now = getMode(self.cpsr.mode.read()) orelse unreachable;
// Bank R8 -> r12
var r: usize = 8;
@@ -233,6 +236,53 @@ pub const Arm7tdmi = struct {
}
}
pub fn panic(self: *const Self, comptime format: []const u8, args: anytype) noreturn {
var i: usize = 0;
while (i < 16) : (i += 4) {
const i_1 = i + 1;
const i_2 = i + 2;
const i_3 = i + 3;
std.debug.print("R{}: 0x{X:0>8}\tR{}: 0x{X:0>8}\tR{}: 0x{X:0>8}\tR{}: 0x{X:0>8}\n", .{ i, self.r[i], i_1, self.r[i_1], i_2, self.r[i_2], i_3, self.r[i_3] });
}
std.debug.print("cpsr: 0x{X:0>8} ", .{self.cpsr.raw});
prettyPrintPsr(&self.cpsr);
std.debug.print("spsr: 0x{X:0>8} ", .{self.spsr.raw});
prettyPrintPsr(&self.spsr);
std.debug.print("tick: {}\n\n", .{self.sched.tick});
std.debug.panic(format, args);
}
fn prettyPrintPsr(psr: *const PSR) void {
std.debug.print("[", .{});
if (psr.n.read()) std.debug.print("N", .{}) else std.debug.print("-", .{});
if (psr.z.read()) std.debug.print("Z", .{}) else std.debug.print("-", .{});
if (psr.c.read()) std.debug.print("C", .{}) else std.debug.print("-", .{});
if (psr.v.read()) std.debug.print("V", .{}) else std.debug.print("-", .{});
if (psr.i.read()) std.debug.print("I", .{}) else std.debug.print("-", .{});
if (psr.f.read()) std.debug.print("F", .{}) else std.debug.print("-", .{});
if (psr.t.read()) std.debug.print("T", .{}) else std.debug.print("-", .{});
std.debug.print("|", .{});
if (getMode(psr.mode.read())) |mode| std.debug.print("{s}", .{modeString(mode)}) else std.debug.print("---", .{});
std.debug.print("]\n", .{});
}
fn modeString(mode: Mode) []const u8 {
return switch (mode) {
.User => "usr",
.Fiq => "fiq",
.Irq => "irq",
.Supervisor => "svc",
.Abort => "abt",
.Undefined => "und",
.System => "sys",
};
}
fn skyLog(self: *const Self, file: *const File) !void {
var buf: [18 * @sizeOf(u32)]u8 = undefined;
@@ -533,16 +583,16 @@ const Mode = enum(u5) {
System = 0b11111,
};
pub fn getMode(bits: u5) Mode {
return std.meta.intToEnum(Mode, bits) catch unreachable;
pub fn getMode(bits: u5) ?Mode {
return std.meta.intToEnum(Mode, bits) catch null;
}
fn armUndefined(_: *Arm7tdmi, _: *Bus, opcode: u32) void {
fn armUndefined(cpu: *Arm7tdmi, _: *Bus, opcode: u32) void {
const id = armIdx(opcode);
std.debug.panic("[CPU:ARM] ID: 0x{X:0>3} 0x{X:0>8} is an illegal opcode", .{ id, opcode });
cpu.panic("[CPU:ARM] ID: 0x{X:0>3} 0x{X:0>8} is an illegal opcode", .{ id, opcode });
}
fn thumbUndefined(_: *Arm7tdmi, _: *Bus, opcode: u16) void {
fn thumbUndefined(cpu: *Arm7tdmi, _: *Bus, opcode: u16) void {
const id = thumbIdx(opcode);
std.debug.panic("[CPU:THUMB] ID: 0b{b:0>10} 0x{X:0>2} is an illegal opcode", .{ id, opcode });
cpu.panic("[CPU:THUMB] ID: 0b{b:0>10} 0x{X:0>2} is an illegal opcode", .{ id, opcode });
}

6
src/cpu/arm/block_data_transfer.zig
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@@ -10,7 +10,7 @@ pub fn blockDataTransfer(comptime P: bool, comptime U: bool, comptime S: bool, c
const rn = opcode >> 16 & 0xF;
const base = cpu.r[rn];
if (S and opcode >> 15 & 1 == 0) std.debug.panic("[CPU] TODO: STM/LDM with S set but R15 not in transfer list", .{});
if (S and opcode >> 15 & 1 == 0) cpu.panic("[CPU] TODO: STM/LDM with S set but R15 not in transfer list", .{});
var address: u32 = undefined;
if (U) {
@@ -45,14 +45,14 @@ pub fn blockDataTransfer(comptime P: bool, comptime U: bool, comptime S: bool, c
fn transfer(cpu: *Arm7tdmi, bus: *Bus, i: u5, address: u32) void {
if (L) {
cpu.r[i] = bus.read32(address);
if (S and i == 0xF) std.debug.panic("[CPU] TODO: SPSR_<mode> is transferred to CPSR", .{});
if (S and i == 0xF) cpu.panic("[CPU] TODO: SPSR_<mode> is transferred to CPSR", .{});
} else {
if (i == 0xF) {
if (!S) {
// TODO: Assure that this is Address of STM instruction + 12
bus.write32(address, cpu.r[i] + (12 - 4));
} else {
std.debug.panic("[CPU] TODO: STM with S set and R15 in transfer list", .{});
cpu.panic("[CPU] TODO: STM with S set and R15 in transfer list", .{});
}
} else {
bus.write32(address, cpu.r[i]);

4
src/cpu/arm/half_signed_data_transfer.zig
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@@ -47,12 +47,12 @@ pub fn halfAndSignedDataTransfer(comptime P: bool, comptime U: bool, comptime I:
0b10 => {
// LDRSB
cpu.r[rd] = util.u32SignExtend(8, @as(u32, bus.read8(address)));
std.debug.panic("[CPU|ARM|LDRSB] TODO: Affect the CPSR", .{});
cpu.panic("[CPU|ARM|LDRSB] TODO: Affect the CPSR", .{});
},
0b11 => {
// LDRSH
cpu.r[rd] = util.u32SignExtend(16, @as(u32, bus.read16(address)));
std.debug.panic("[CPU|ARM|LDRSH] TODO: Affect the CPSR", .{});
cpu.panic("[CPU|ARM|LDRSH] TODO: Affect the CPSR", .{});
},
}
} else {

2
src/cpu/arm/psr_transfer.zig
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@@ -30,7 +30,7 @@ pub fn psrTransfer(comptime I: bool, comptime R: bool, comptime kind: u2) InstrF
if (cpu.isPrivileged()) cpu.setCpsr(fieldMask(&cpu.cpsr, field_mask, right));
}
},
else => std.debug.panic("[CPU/PSR Transfer] Bits 21:220 of {X:0>8} are undefined", .{opcode}),
else => cpu.panic("[CPU/PSR Transfer] Bits 21:220 of {X:0>8} are undefined", .{opcode}),
}
}
}.inner;

2
src/cpu/thumb/format1.zig
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@@ -17,7 +17,7 @@ pub fn format1(comptime op: u2, comptime offset: u5) InstrFn {
0b00 => shifter.logicalLeft(true, &cpu.cpsr, cpu.r[rs], offset), // LSL
0b01 => shifter.logicalRight(true, &cpu.cpsr, cpu.r[rs], offset), // LSR
0b10 => shifter.arithmeticRight(true, &cpu.cpsr, cpu.r[rs], offset), // ASR
else => std.debug.panic("[CPU|THUMB|Fmt1] {} is an invalid op", .{op}),
else => cpu.panic("[CPU|THUMB|Fmt1] {} is an invalid op", .{op}),
};
// Equivalent to an ARM MOVS

4
src/cpu/thumb/format13.zig
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@@ -6,8 +6,8 @@ const InstrFn = @import("../../cpu.zig").ThumbInstrFn;
pub fn format13(comptime _: bool) InstrFn {
return struct {
fn inner(_: *Arm7tdmi, _: *Bus, _: u16) void {
std.debug.panic("[CPU|THUMB|Fmt13] Implement Format 13 THUMB Instructions", .{});
fn inner(cpu: *Arm7tdmi, _: *Bus, _: u16) void {
cpu.panic("[CPU|THUMB|Fmt13] Implement Format 13 THUMB Instructions", .{});
}
}.inner;
}

2
src/cpu/thumb/format16.zig
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@@ -14,7 +14,7 @@ pub fn format16(comptime cond: u4) InstrFn {
const offset = u32SignExtend(8, opcode & 0xFF) << 1;
const should_execute = switch (cond) {
0xE, 0xF => std.debug.panic("[CPU/THUMB] Undefined conditional branch with condition {}", .{cond}),
0xE, 0xF => cpu.panic("[CPU/THUMB] Undefined conditional branch with condition {}", .{cond}),
else => checkCond(cpu.cpsr, cond),
};

2
src/cpu/thumb/format5.zig
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@@ -20,7 +20,7 @@ pub fn format5(comptime op: u2, comptime h1: u1, comptime h2: u1) InstrFn {
cpu.cpsr.t.write(cpu.r[src] & 1 == 1);
cpu.r[15] = cpu.r[src] & 0xFFFF_FFFE;
},
else => std.debug.panic("[CPU|THUMB|Fmt5] {} is an invalid op", .{op}),
else => cpu.panic("[CPU|THUMB|Fmt5] {} is an invalid op", .{op}),
}
}
}.inner;